4. INTRODUCTIONā¦
Fibro-osseous lesions of the jaw comprise a
diverse group of conditions in which the
normal architecture of bone is replaced by
ļ¬brous tissue and may contain varying
amounts of mineralised substance which
may be bone, cementum or both in
appearance.
The term ļ¬bro-osseous lesion was originally a
histo-pathological term
4
6. CLASSIFICATION SYSTEMSā¦
The various classiļ¬cations systems proposed by authors
are enumerated as below.
Ā Charles Waldron Classiļ¬cation Of Fibro-Osseous Lesions Of The Jaws (1985)
Ā Working Classiļ¬cation Of Fibro-Osseous Lesions By Mico M. Malek (1987)
Ā Peiter J. Slootweg & Hellmuth Muller (1990)
Ā WHO Classiļ¬cation (1992)
Ā Waldron Modiļ¬ed Classiļ¬cation Of Fibro-Osseous Lesions Of Jaws (1993) āØ
6
7. CLASSIFICATION SYSTEMSā¦
The various classiļ¬cations systems proposed by
authors are enumerated as below. āØ
Ā Brannon & Fowler Classiļ¬cation (2001)
Ā WHO Classiļ¬cation Of Fibro-Osseous Lesions Of Jaws (2005)
Ā Paul M. Speight & Roman Carlos Classiļ¬cation (2006)
Ā Eversole Classiļ¬cation (2008) āØ
7
8. CLASSIFICATIONā¦
Fibro-osseous Lesions of Jaws Classiļ¬cation
1. Fibrous Dysplasia
a. Monostotic
b. Polyostotic
8
2. Cemento-osseous Dysplasia
a. Periapical Cemental Dysplasia
b. Focal Cemento-osseous Dysplasia
c. Florid Cemento-osseous Dysplasia (Gigantiform Cementoma)
10. CLASSIFICATIONā¦
Waldronās Classiļ¬cation (1993)
1. Fibrous Dysplasia
a. Monostotic
b. Polyostotic
10
2. Fibro-Osseous (Cemental) Lesions Presumably Arising In The
Periodontal Ligament
a. Periapical Cemental Dysplasia
b. Localized Fibro-Osseous-Cemental Lesions (Probably Reactive In Nature)
c. Florid Cemento-osseous Dysplasia (Gigantiform Cementoma)
d. Ossifying & Cementifying Fibroma
11. CLASSIFICATIONā¦
Waldronās Classiļ¬cation (1993)
11
3. Fibro-Osseous Neoplasms Of Uncertain Or Detectable
Relationship To Those Arising In The Periodontal Ligament
(Category II) āØ
a. Cemetoblastoma, Osteoblastoma & Osteoid Osteoma āØ
b. Juvenile Active Ossifying Fibroma & Other So Called Aggressive, Active
Ossifying/Cementifying Fibromas āØ
12. CLASSIFICATIONā¦
Brannon & Fowlerās Classiļ¬cation
1. Fibrous Dysplasia
a. Monostotic
b. Polyostotic
c. Craniofacial
d. McCune-Albright syndrome
2. Osseous Dysplasia
a. Periapical
b. Focal
c. Florid
d. Familial gigantiform cementoma
3. Ossifying Fibroma & Juvenile Ossifying Fibroma
12
13. IMPORTANCE OF RADIOLOGY IN
DIAGNOSIS OF FIBRO-OSSEOUS
LESIONSā¦
The radiologist plays a central role in diagnosis of
ļ¬bro-osseous lesions.
Charles Waldron had stated
āIn the absence of good clinical & radiologic
information, a pathologist can only state a biopsy to be
consistent with a ļ¬bro-osseous lesionā
Therefore, identiļ¬cation of majority of FOLs is based
on clinical and radiological features.
13
14. IMPORTANCE OF RADIOLOGY IN
DIAGNOSIS OF FIBRO-OSSEOUS
LESIONSā¦
Many ļ¬bro-osseous lesions are symptomless and
require no surgery. Therefore, diagnosis of the
lesions on clinical & radiological features may
obviate the need for surgery
This my beneļ¬t the patient, as ļ¬brous dysplasia
may show exaggerated growth after surgery
14
15. IMPORTANCE OF RADIOLOGY IN
DIAGNOSIS OF FIBRO-OSSEOUS
LESIONSā¦
Radiological evaluation-
Plain radiography
IOPAR
Occlusal radiograph
Bitewing radiograph
15
16. IMPORTANCE OF RADIOLOGY IN
DIAGNOSIS OF FIBRO-OSSEOUS
LESIONSā¦
Radiological evaluation-
CT- expansile, destructive lesions, cortical
breakthrough & extra-osseous extensions
MRI- solid from non-solid masses
16
18. FIBROUS DYSPLASIA
-Introduction
WHO (1992) deļ¬ned ļ¬brous dysplasia as
āA benign lesion, presumably developmental in nature,
characterised by a presence of ļ¬brous connective tissue
with a characteristic whorled pattern and containing
trabeculae of immature boneā
Asymptomatic regional alteration of bone in which normal
architecture of bone is replaced by trabeculae-like osseous
structures; lesions may be monostotic or polyostotic, with or
without associated endocrinal disturbances
- Eversole
18
20. FIBROUS DYSPLASIA
-History
First citation by von Recklinghausen in 1891
Albright pointed out that 2 cases mentioned by von
Recklinghausen- ļ¬brous dysplasia
Lichtenstein- term FIBROUS DYSPLASIA (1938)
Initially considered- Polyostotic
Lichtenstein & Jaffe expanded the concept-
monostotic
20
21. FIBROUS DYSPLASIA
-History
McCune & Albright (1936 &1937) described an
association of abnormal skin pigmentation &
precocious puberty
(McCune-Albright Syndrome)
Jaffe-Lichtenstein described the association of
polyostotic ļ¬brous dysplasia with abnormal
pigmentation
(Jaffe-Lichtenstein Syndrome)
21
22. FIBROUS DYSPLASIA
-Aetiology & Pathogenesis
GNAS1 gene
Activation of GSšŖ subunit of G protein complex
Production of cAMP
22
MUTATION
CONTINUOUS
23. FIBROUS DYSPLASIA
-Pathogenesis
1. Hyperfunction of endocrine glands
2. Increased production of melanocytes
3. Affects differentiation of osteoblastsā impairs
ability to form mature osteoblasts
Fibrous tissue is produced + trabeculae contain
āļ¬uid-ļ¬lled cystsā ā GROUND-GLASS APPEARANCE
23
28. JUVENILE FIBROUS DYSPLASIA
-Clinical Presentation
Asymptomatic
Swelling is not prominent &
eventually becomes
prominent
In teenageā swelling may
become prominent.
Slowly growing ; in
aggressive form, growth is
more rapid than rest of the
bone
28
30. JUVENILE FIBROUS DYSPLASIA
-Clinical Presentation
Aggressive form:
Pain, trauma & ulceration
2o to impingement by
teeth
In maxilla- may extend to
involve
Floor of the orbit
Nasal passages
30
31. ADULT MONOSTOTIC FIBROUS DYSPLASIA
-Introduction
Rare form
Spontaneously occurring
May appear similar to ossifying ļ¬broma but must be
differentiated from it
31
32. ADULT MONOSTOTIC FIBROUS DYSPLASIA
-Clinical Presentation
Asymptomatic
Diffuse expansion of
cortices
Movement of teeth
within the area may
occur
32
33. ADULT MONOSTOTIC FIBROUS DYSPLASIA
-Radiographic Features
Differs from juvenile
form.
Less homogenous &
p r e s e n t s a s m i x e d
r a d i o l u c e n t - r a d i o -
o p a q u e l e s i o n ā
ā COTTON-BALLā pattern
33
35. POLYOSTOTIC FIBROUS DYSPLASIA
-Clinical Features
15-20% of remaining cases- POLYOSTOTIC in nature
SITE- Skull & facial bones, pelvis, femur, tibia, spine &
shoulder girdle;
Single limb or all the limbs with/ without axial skeleton
involvement
UNILATERAL, but if disease is generalisedā may be BILATERAL
35
36. POLYOSTOTIC FIBROUS DYSPLASIA
-Clinical Presentation
Symptomatic before 10years
INITIAL PHASE- Pain in limb with
associated limp or spontaneous
fracture
Leg length discrepancy- 70%
cases
Weight-bearing bonesā BOWED
Curvature of femoral shaft &
neck- SHEPHERDāS CROOK
DEFORMITY (characteristic feature)
36
38. JAFFE-LICHTENSTEIN SYNDROME
-Clinical Features
Variable number of bones are involved
Accompanied by abnormal pigmentation in skin (CAFE-AU-
LAIT SPOTS)
Pigmentation may occur at birth & may precede other
symptoms
Occurs in same side as that of the bony lesion
38
40. McCUNE-ALBRIGHTāS SYNDROME
-Clinical Features
McCune Albright syndrome affects females >males
The most common endocrinal abnormality: sexual precocity
Other endocrinal manifestations are:
Accelerated skeletal growth Acromegaly
Gigantism Hyperprolactenimia
Cushingās syndrome Hyperthyroidism
Diabetes mellitus Hypothalamic hypogonadism
Hypophospahtemic rickets Gynecomastia
Spermatogenesis
40
41. CRANIOFACIAL FORM
-Clinical Features
Occurs in 50% of
polyostotic cases;
10-25% of monostotic
cases
SITE- Frontal, sphenoid,
maxillary, ethmoid; less
commonly occipital,
temporal
45. FIBROUS DYSPLASIA
-Radiographic Features
Course of the diseaseā
Early lesion-
Radiolucent
Ill-deļ¬ned borders
Surrounding areas-
increased density (granular
appearance)
Unilocular; may appear
multilocular
45
49. FIBROUS DYSPLASIA
-Radiographic Features
Internal Structure-
Density & trabecular pattern
vary
Variation is more in mandible
May be
Radiolucent,
Radio-opaque or a
Mixed radiolucent-radio-
opaque lesion
49
50. FIBROUS DYSPLASIA
-Radiographic Features
Internal Structure-
OBISESAN ET ALāS CLASSIFICATION of
Radiographic Features of Fibrous
Dysplasia:-
PEAU DE ORANGE- resembling
surface of an orange
GROUND-GLASS- resembling
shattered wind-screen
PAGETOID- wispy arrangement
with alternating areas of
radiolucency & radio-opacity
50
51. FIBROUS DYSPLASIA
-Radiographic Features
Internal Structure-
OBISESAN ET ALāS CLASSIFICATION of
Radiographic Features of Fibrous
Dysplasia:-
FINGERPRINTā swirling pattern
CYST-LIKE RADIOLUCENCYā
Radiolucent lesions resembling
cysts may occur in mature lesions
CHALKY-TYPEā Well-circumscribed
lesion with amorphous dense
radio-opaque material
51
53. FIBROUS DYSPLASIA
-Radiographic Features
Effects on Surrounding
Structures-
MAXILLARY SINUS-
May expand into it
Displaces cortical outline
Occupies part or most of the
sinus cavity
Extension into sinus is
through LATERAL WALL
53
54. FIBROUS DYSPLASIA
-Radiographic Features
Effects on Surrounding
Structures-
MAXILLARY SINUS-
Last section to be involved:
POSTERO-SUPERIOR PORTION
Parallel thickening of cortical
border-results in residual air
spaceā approximately the
normal anatomic shape of
the antrum
54
55. FIBROUS DYSPLASIA
-Radiographic Features
Effects on Surrounding
Structures-
ALVEOLAR BONE-
Bone is altered without
affecting the dentition.
TEETH-
LAMINA DURA IS ABSENT
PDL SPACE may appear very
narrowā if ļ¬brous dysplasia
increases bone density.
55
56. FIBROUS DYSPLASIA
-Radiographic Features
Effects on Surrounding
Structures-
TEETH-
Displaces teeth
Interfere with normal
eruption
RARELY, root resorption
may occur
Involved teeth may
have- HYPERCEMENTOSIS
56
58. FIBROUS DYSPLASIA
-Other Imaging Modalities
58
ROLE OF ULTRASOUND:
Helpful for assessing extraskeletal manifestations
Usually USG of thyroid and gonads done : evaluate
activity and structure of glands and gonads
ROLE OF MRI:
Not useful as CT and plain ļ¬lms. On T1-weighted
MRIs, the lesion has low-to-intermediate signal
intensity equal to that of muscle. T2-weighted images
also show low signal intensity owing to the high
content of collagen and bone
59. FIBROUS DYSPLASIA
-Other Imaging Modalities
59
BONE SCINTIGRAPHY:
Accumulation of isotope increases because of the
lesion's hypervascularity.
Pathologic or stress fractures also can increase
isotopic activity in the lesions.
The features on the bone scan are nonspeciļ¬c for a
conclusive diagnosis based solely on the distribution
of the isotope.
60. FIBROUS DYSPLASIA
-Other Imaging Modalities
BONE SCINTIGRAPHY:
Hot spots or increased
uptake of the
radioisotope tracer
technetium-99m
methylene
diphosphonate (99mĀ Tc
MDP) occurs in the
spine, pelvis, ribs, and
appendicular skeleton.
61. FIBROUS DYSPLASIA
-Diļ¬erential Diagnosis
Metabolic Bone disease FD
Number of bones
involved
Polyostotic Monostotic
Bilateral Unilateral
Expansion NO ā
61
Pagetās Disease FD
Expansion ā ā
Age >40 years Younger individuals
Site
If mandible- whole of
mandible
Unilateral
62. FIBROUS DYSPLASIA
-Diļ¬erential Diagnosis
Periapical Cemental
Dysplasia
FD
Age Older individuals Younger
Bilateral Unilateral
62
Osteomyelitis FD
Expansion
Enlargement- on the
surface of outer cortex
Evidence of original cortex
Expands internal
structure
Sequestrum ā NO
63. FIBROUS DYSPLASIA
-Diļ¬erential Diagnosis
Cemento-ossifying Fibroma FD
Displacement ā NO
One speciļ¬c centre NO ā
Bone alteration
around teeth
ā ā
63
Neoplasm FD
Expansion
Convex extension is
noted
Extension into antrum
causes expansion- but,
original contour is
maintained
64. FIBROUS DYSPLASIA
-Histopathological Features
Woven bone is present in the
form of irregular shaped
trabeculae (Chinese script
writing)
Trabeculae are delicate and are
not connected to one another;
not sharply deļ¬ned
Bone formed is metaplastic in
nature. This form of metaplasia
is called a ļ¬bro-osseous
metaplasia
64
65. FIBROUS DYSPLASIA
-Histopathological Features
Fibrous stroma comprises
immature appearing small,
slender spindle cells in loose
and whorled arrangement.
Giant cells are usually not seen
in lesions of ļ¬brous dysplasia
b u t i f s e e n a r e u s u a l l y
associated with the pre-existing
mineralized tissue.
65
66. FIBROUS DYSPLASIA
-Laboratory Investigations
Serum Ca2+ & P : normal
Serum Alk Phosphatase: ed
Urinary hydroxyproline, speciļ¬c index of bone
collagen resorption: ed
McCune-Albrightās Syndrome- circulating hormones:
ed
67. FIBROUS DYSPLASIA
-Management
67
Mostly clinical & radiological features are
sufļ¬cient to make a diagnosis of Fibrous dysplasia
Reports- exaggeration of growth of lesionā due to
surgical intervention
Monitor the lesion
Ask patient to report if any changes
68. FIBROUS DYSPLASIA
-Medical Management
68
Limited use in polyostotic cases
1. Bisphosphonates: Palmidronate 180mg i.v. every
6months/ i.v. 1-1.5mg/kg/day for 3 consecutive days,
given every 4months
ā”es- bone pain
ā”es- bone resorption
es- bone mineral density
69. FIBROUS DYSPLASIA
-Medical Management
69
2. Calcitonin: Calcitonin injections in doses ranging
from 50 to100 IU three times weekly for a period of
3-months were given subcutaneously
ā”es- bleeding
es- bone formation
3. Supportive therapy: Vitamin D and calcium
70. FIBROUS DYSPLASIA
-Pain in ļ¬brous dysplasia
70
Sprouting of neuroma like structures
As a result of GNAS mutationāincreased IL-6 secretion
73. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Introduction
Localised change in normal bone metabolism
that results in replacement of the components of
normal cancellous bone with ļ¬brous tissue and
cementum-like material, abnormal bone or a
mixture of the two.
Lesion located near the apex of the tooth
73
74. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Clinical Features
AGE- Middle age; >30years and mean age is 39years
GENDER- ā : ā = 9 : 1
RACE- Blacks : Whites= 3 : 1 ; frequently seen in
Asians
74
76. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Location-
Epicentre- at the apex,
apical-third of root
Mandibular anterior
teeth
Rarely maxillary teeth
Multiple or bilateral;
occasionally solitary
lesion may arise
76
77. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Periphery-
Well-deļ¬ned
Radiolucent border may
surround the lesion
Followed by reactive
sclerotic border
Shape-
May be irregular or have
round or oval shape
77
79. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Internal Structure-
MIXED STAGE: Radio-
opaque tissue appears
in the lesion. Round/
o v a l / i r r e g u l a r .
Sometimes cementum-
like material may form
s w i r l i n g p a t t e r n
(CEMENTICLES)
79
81. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Effects on surrounding
structures-
LAMINA DURA: Loss
PDL SPACE: Widened
TOOTH: Not affected; rarely
r e s o r p t i o n o r
hypercementosis
JAW BONE: Expansion may
be seen with thin intact
cortex. Undulating in shape
81
82. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
EARLY STAGE
PCOD
Apical periodontitis/PA
abscess
Pulp vitality test Responsive Not/delayed response
82
MIXED STAGE
PCOD
Rarefying & condensing
osteitis
Apical region Lamina dura intact
Radiolucent zone next to
root apex
83. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
83
MIXED STAGE
PCOD
Rarefying &
condensing
osteitis
Chronic
Osteomyelitis
Apical
region
Lamina dura
intact
Radiolucent zone
next to root apex
Radiolucent zone
next to root apex
Well-deļ¬ned
lesion
Moth-eaten
appearance
PCOD Calcifying crowns
Age > 30years < 20years
84. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
84
MIXED STAGE
PCOD Odontoma
Radio-opacity Less radio-opaque More radio-opaque
Position irt adj.
teeth
At the apical region
Seldom below; usually
above uneruted teeth
PCOD Post-surgical defect
No such history H/o recent enucleation
86. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
86
MIXED STAGE
PCOD Fibrous Dysplasia
Age >30years 1st to 2nd decade
Gender ā: ā = 3:1 No gender predilection
Site Mandible (90%) Maxilla
Jaw
expansion
Nodular/dome
shaped
Fusiform shaped
Frequency of
occurrence
Less common More common
Margins Well-deļ¬ned lesion
Poorly deļ¬ned
Imperceptibly merges with adj
bone
87. PERIAPICAL CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
87
MIXED STAGE
PCOD Cemento-ossifying ļ¬broma
Age >30years <30years
Gender Marked ā
predilection
Lesser ā predilection
Site Mandibular anterior PM-M region
Jaw
expansion
Minimal Tendency for expansion
Frequency of
occurrence
Maximum size- < 1cm More common
94. FOCAL CEMENTO-OSSEOUS DYSPLASIA
-Histopathological Features
Cellular ļ¬brous tissueā
c o n t a i n s i r r e g u l a r
trabeculae of woven bone
o r c e m e n t u m - l i k e
calciļ¬cations
S c a t t e r e d f o c i o f
multinucleated giant cells
may be seen
94
99. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Introduction
Also called Familial Multiple Cementoma
The term was introduced by Melrose et al in 1976
It is a widespread form of Periapical Cemento-osseous
Dysplasia
Diagnosis-
PCOD in 3-4 quadrants (or)
Extensively formed in one jaw
99
101. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Clinical Features
AGE- middle age (mean age= 42years)
GENDER- Female predilection; uncommon in males
SITE-
Bilaterally occurring and symmetrical lesions in
jaws
Limited to alveolar bone of the jaws
101
102. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Clinical Presentation
Signs & symptoms are
generally absent
Partially or completely
edentulous
DULL PAIN- if exposed to
oral cavityā 2o infectedā
OSTEOMYELITIS
S u p e r ļ¬ c i a l - a s b o n e
resorption is faster than
the sclerotic masses
102
103. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Location-
Bilaterally present
Both jaws; if only one-
mand>> max
Epicentre- Apical to teeth
within alveolar process
Posterior to canines
Mandible- above the
mandibular canal
103
105. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Internal Structure-
Varies from mixed radiolucent-radio-opaque to completely
radio-opaque
Some prominent radiolucent areasā development of simple
bone cyst
Small, oval/round regions to large amorphous calciļ¬ed areas
105
106. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Radiographic Features
Effect on Surrounding Structures-
Mandibular canal: can be displaced
inferiorly
Maxillary sinus: can be displaced
superiorly
Alveolar bone: expansion of
cortical plates
Roots: May show hypercementosis;
may fuse with cementum of
abnormal tissue of lesion 106
107. FLORID CEMENTO-OSSEOUS DYSPLASIA
-Diļ¬erential Diagnosis
107
Florid Cementoāosseous
Dysplasia
Pagetās Disease
Mandibular
canal
Above mandibular canal Entire mandible
Site Only jaws
Polyostotic including
jaws
Florid Cementoā
osseous Dysplasia
Chronic Sclerosing
Osteomyelitis
Only alveolar bone Alveolar & basal bone
Cementum-like masses may resemble sequestrum
110. GIGANTIFORM CEMENTOMA
-Introduction
Rare, benign ļ¬bro-osseous disease of the jaws
Characterised by formation of massive sclerotic masses of
disorganised mineralised tissue
Norberg in 1931, ļ¬rst described Gigantiform Cementoma
Familial cases > Sporadic cases; autosomal dominant
WHO in 1971, later re-classiļ¬ed it under cemental
lesions
110
111. GIGANTIFORM CEMENTOMA
-Clinical Features
AGE- Younger age group; occasionally older
individuals
GENDER- No gender predilection
SITE- Both the jaws; multifocal & multiquadrant
Lesions tend to plateau after cessation of growth
111
114. GIGANTIFORM CEMENTOMA
-Radiographic Features
Other features-
Expansile
C r o s s e s m i d l i n e
(sometimes lesion may
develop in posterior
r e g i o n & e n l a r g e
towards the anterior
part of the jaws &
become conļ¬uent
114
117. OSSIFYING FIBROMA
-Introduction
Before reļ¬ning the concept of focal cemento-
osseous dysplasia, Ossifying ļ¬broma, was thought
to be common
Presentlyā relatively rare
Radiographically- focal cemento-osseous dysplasia
Histopathologically- neoplasm with signiļ¬cant
growth potential
117
118. OSSIFYING FIBROMA
-Introduction
In 1972, WHO classiļ¬cation separated
cementifying and ossifying ļ¬broma
Cementifying ļ¬broma- spherical calciļ¬cations
Ossifying ļ¬broma- predominant osseous
component
118
119. OSSIFYING FIBROMA
-Introduction
Origin of these cementum-like calciļ¬cationsā
uncertainā extra-gnathic sites
Bone & cementumā cannot be distinguished
histologically
119
120. OSSIFYING FIBROMA
-Aetiology & Pathogenesis
Occurs mostly in jawsā originate from pluripotent cells-
periodontal membrane
Recently mutations in HRPT2 geneā rare syndrome called
Hyperparathyroidism- jaw tumour syndrome
Characterised by
Parathyroid adenoma/carcinoma
Ossifying ļ¬bromas of the jaws
Renal cysts
Wilmās tumour
120
121. OSSIFYING FIBROMA
-Aetiology & Pathogenesis
Identiļ¬cation of HRPT2 gene mutationā 2
sporadic cases
Function of paraļ¬bromin & mechanism of
tumour formationā NOT KNOWN
121
122. OSSIFYING FIBROMA
-Clinical Features
AGE- 3rd- 4th decade of life
GENDER- Female predilection
SITE- Mandible>> Maxilla
Premolar-molar region
Tooth-bearing areasā may extend into ramus
122
123. OSSIFYING FIBROMA
-Clinical Presentation
Hard, localised, slow-growing
painless mass
May displace adjacent structures
Exfoliation of teeth
Expansion of inferior border
followed by buccal cortical plate
expansion
123
125. OSSIFYING FIBROMA
-Radiographic Features
Number- Single
Location- Exclusively in
facial bones; mandible-
PM-M regions; superior
to mandibular canal. In
maxilla- canine fossa
Periphery- Well-
deļ¬ned, radiolucent rim;
sclerotic border
125
126. OSSIFYING FIBROMA
-Radiographic Features
Internal Structure-
Radio-opaque-radiolucent lesions
Sometimesā radiolucent
In the type that contains abnormal
trabeculaeā pattern may be similar to
ļ¬brous dysplasia
May be ļ¬occulentā cotton-ball appearance
Lesions with amorphous bone- solid,
homogenous radiopaque regions
Eversole- unilocular & multilocular
appearance
126
127. OSSIFYING FIBROMA
-Radiographic Features
Effect on Surrounding Structures-
Concentric growth- within medulla
Outward expansion in all directions-
cortical plate is thinned out but
INTACT
Teeth:-
Displacement- ā
Root resorption- ā
Lamina dura- Loss 127
128. OSSIFYING FIBROMA
-Radiographic Features
Effect on Surrounding Structures-
Mandibular canal:-
Displacement- ā
Maxillary sinus:-
Can grow into & occupy most of the
sinus
Expands its wall outwards
Bony partition remains between them 128
129. OSSIFYING FIBROMA
-Diļ¬erential Diagnosis
129
Ossifying ļ¬broma Fibrous Dysplasia
Margins Better deļ¬ned
Blends into surrounding
bone
Internal
structure
More variation
Less variation; more
homogenous in maxilla
Displacement
ā- displaces from an
epicentre
ā
Root resorption ā ā
Expansion of
bone
ā- More concentric
about an epicentre
ā- Enlarges bone &
distorts shapeā normal
morphology
131. OSSIFYING FIBROMA
-Histopathological Features
Fibrous stroma- highly
cellular
Hard-tissue portionā in
the form of osteoid or
cellular spherules
Variation in type of
mineralised material- not
seen in Fibrous dysplasia
131
134. JUVENILE OSSIFYING FIBROMA
-Introduction
Controversial lesion
Distinguished from the larger group of ossifying ļ¬bromas
based on
Age
Common site of involvement
Clinical behaviour
2 patterns have been noted- Trabecular & Psammomatoid
134
135. JUVENILE OSSIFYING FIBROMA
-Introduction
According to WHO,
āA ļ¬bro-osseous lesion that is characterised by
cellular rich ļ¬brous tissue, bands of cellular
osteoid trabeculae and giant cells.ā
135
136. JUVENILE OSSIFYING FIBROMA
-Clinical Features
AGE- Mean age are 11years and 22 years; 2-15
years
GENDER- No gender predilection (slight male
predilection)
SITE- Maxillary predominance
Psammomatoid- extra-gnathic sites ( 70%-
orbital, frontal bones & paranasal sinuses)
136
137. JUVENILE OSSIFYING FIBROMA
-Clinical Presentation
May be an incidental
ļ¬nding
Sometimes- clinically
detectable facial
deformity
Pain & paraesthesia-
rarely
137
138. JUVENILE OSSIFYING FIBROMA
-Clinical Presentation
COMPLICATIONS- due to
impingement on
neighbouring structures
Nasal obstruction
Exophthalmos
Proptosis
Temporary/permanent
blindness
138
139. JUVENILE OSSIFYING FIBROMA
-Radiographic Features
Unilocular/multilocular
Location- In jaws > in maxilla.
Psammomatoid- in extra-gnathic sites
Periphery- Well-deļ¬ned, radiolucent
rim; sclerotic border
Internal structure- Central
opaciļ¬cation
Effect on Surrounding Structures-
Cortical plate thinning & perforation
139
140. JUVENILE OSSIFYING FIBROMA
-Radiographic Features
CT ļ¬ndings- Well-deļ¬ned
borders, thin sclerotic shell.
C o r t i c a l d i s r u p t i o n &
i n vo l v e m e n t o f a d j a c e n t
structures. More aggressive than
Fibrous dysplasia or ossifying
ļ¬broma
MRI ļ¬ndings- Intermediate to
low signal intensity on MRI.
G r e a t e r s p e c i ļ¬ c i t y wh e n
n e u r o va s c u l a r o r o c u l a r
involvement is there.
140
141. JUVENILE OSSIFYING FIBROMA
-Histopathological Features
Not encapsulated
Well-demarcated from
surrounding bone
Cellular ļ¬brous tissue- some
areas are highly cellular
whereas some may not be
Mitotic ļ¬gures- are found
Mieralised component-
Trabecular & psammomatoid
141
142. JUVENILE OSSIFYING FIBROMA
-Management
142
Non-aggressive forms- conservative approach
Aggressive form- enbloc resection
Troulis & colleagues- 4 stages of treatment
Kaban & colleagues- 2 stages of treatment
( Aggressive JOF in maxilla & orbit)
Recurrence- 30-58%
No evidence of malignant transformation
143. A NOTE ON FEW OTHER SIMILAR APPEARING
LESIONS
143
144. NOTE ON FEW OTHER LESIONS
-Diagnostic Clues
144
CHERUBISM- Appears between 2-7years of age
Bilateral & symmetrical swelling of mandible
Radiographically- multilocular lesion in the mandible,
bilateral
Histopathologically- giant cells are preponderant
PAGETāS DISEASE- 3 PHASES; >40years of age; Max>> mandible
Bilateral presentation; radiolucentā cotton-wool appearance
Cortex-intact but thinned; linear horizontal trabecular pattern
Lumen of maxillary sinus is spared
HYpercementosis is seen loss of lamina dura; Resorption is
rare
145. NOTE ON FEW OTHER LESIONS
-Diagnostic Clues
145
CEMENTOBLASTOMA- 12-65years; relatively young; slight male predilection
Mandible>> maxillaā PM-M region
Well-deļ¬ned with a radiolucent rim and a sclerotic border in the
surrounding bone
Mixed radilucent-radio-opaque- majority are radioopaque. Amorphous/
wheel-spoke pattern
If root outline is apparentā root resorption; mostly obscures the root
outline
May cause expansion with intact outer cortex
OSTEOBLASTOMA- Rare in the jaws, 5-22years
Most cases- condylar process; If in tooth-bearing areasā root resorption
Appears radiolucent solitary lesion
147. DIAGNOSING FEATURES
-Diļ¬erential Diagnosis
147
BASED ON AGE
Before 30years After 30years
Cherubism Cemento ossifying ļ¬broma
Fibrous dysplasia Cemento- osseous dysplasia
Juvenile ossifying ļ¬broma Pagetās disease
BASED ON GENDER
FEMALES MALES
Cemento- osseous dysplasia Juvenile ossifying ļ¬broma
Fibrous dysplasia
148. DIAGNOSING FEATURES
-Diļ¬erential Diagnosis
148
BASED ON SITE OF OCCURRENCE
ANT. MANDIBLE ANT. MAXILLA POST. MANDIBLE POST. MAXILLA
PCOD
Juvenile OF
Ossifying ļ¬broma
Ossifying
Fibroma
Fibrous
Dysplasia
Juvenile OF
FCOD
Florid COD
Gigantiform Cementoma
149. DIAGNOSING FEATURES
-Diļ¬erential Diagnosis
149
BASED ON CLINICAL PRESENTATION
CLINICAL PRESENTATION Lesions associated
Swelling and facial
disļ¬gurement
Fibrous dysplasia
Gigantiform cementoma
Incidental ļ¬nding Cemento osseous dysplasia
Pain Juvenile Ossifying Fibroma
Self limiting Fibrous dysplasia
Continuous growth Neoplasms
150. FIBRO-OSSEOUS LESIONS
-Clinical Evaluation
150
Facial deformity
Vestibular obliteration
Overlying mucosa- same as the adjacent
tissues
Bony-hard in consistency
Non-tender on palpation
May show ulceration due to trauma
Displacement, malpositioning of teeth with
malocclusion
Mobility of teeth
H/o pain or paraesthesiaā rarely
151. RADIOGRAPHIC DIAGNOSING FEATURES
-Diļ¬erential Diagnosis
151
RADIOLUCENT STAGE- UNILOCULAR
TEETH NOT ASSOCIATED
Periapical granuloma Stafne bone cavity
Periapical cyst Osteoblastoma
Periapical abscess Cemento-ossifying ļ¬broma
PCOD
Cemento-ossifying ļ¬broma
152. RADIOGRAPHIC DIAGNOSING FEATURES
-Diļ¬erential Diagnosis
152
RADIOLUCENT STAGE- MULTILOCULAR
TEETH NOT ASSOCIATED
Odontogenic myxoma Central Giant Cell Granuloma
Glandular Odontogenic Cyst Juvenile Ossifying Fibroma
Ameloblastoma Hyperparathyroidism
Juvenile Ossifying Fibroma Metastatic tumours of the jaws
Ossifying Fibroma Ossifying Fibroma
Cherubism
156. FIBRO-OSSEOUS LESIONS
-Conclusions
156
Thus, a working knowledge of the clinical
features, presentation and radiographic features
is of utmost importance in identifying and
diagnosing a ļ¬bro-osseous lesion to help in
providing guidance in chosing the right treatment
modality for the patient.