Beingn bone tumours
• Bone forming tumours:
1. Bone island
2. Osteoid osteoma
3. Osteoblastoma
• Cartilage forming tumour
1. Chondroma
2. Chon...
• Fibrous tumours
1. Fibrous cortical defect
2. Non ossifying fibroma
Bone island ( aka enostosis)
• Single/multiple
• Always medullary in location
• Normal compact lamellar bone
• Uniformly d...
Osteoid Osteoma
• 20- 30 yrs
• M:F=3:1
• Intermittent bone pain of several wks/ mnths
duration occuring esp at night with ...
Imaging features
• Round/ oval area of radiolucency with a sclerotic
margin
• Radiolucency contains a small dense opacity ...
Osteoblastoma
• Long h/o pain at night ( relief by aspirin is not a
feature)
• M=F
• <30 yrs
• Rare lesion
• MC affects sp...
Chondroma
• single tumours are common
• MC in phalanges of hand and feet
• Although any bone maybe affected
• Risk of mali...
Imaging features:
• Well defined zone of radiolucency in medulla
• Small bones of hand and feet are likely to
expand and t...
Juxtacortical chondroma
• arises at the surface of the bone.
• Scalloping of cortical bone is possible,
• no marrow involv...
Multiple enchondromas
Mafucci’s syndrome
• Multiple
enchondromas+
cavernous
hamenagiomas in
soft tissues
Chondroblastoma
• Relatively rare
• Epiphysis/apophysis
• Long h/o pain
• Well defined radiolucent oval lesion within
epip...
Chondromyxoid fibroma
• 20-30 yrs
• M=F
• Usually occurs around the knee
• Occurs in metaphysis
• Radiolucent well defined...
Osteochondroma
• Osseous outgrowth from bony cortex
• Single>multiple
• When multiple k/a diaphyseal aclasia
• Very small ...
• Bony protrusions covered by cartilaginous cap
• Growth in childhood takes place in the cap,
• A thick cartilaginous cap ...
Fibrous cortical defect
• Common lesion
• 2-15 yrs
• MC around knee ( sp distal posteromedial
femoral cortex)
• Blister li...
• lucent intracortical defects
• outlined by a thin rim of sclerosis
• no involvement of the underlying medullary
cavity
•...
Non ossifying fibroma
• Similar to FCD except that it is much larger
• 10-20yrs
• MC around knee ( esp distal end of femur...
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
Beingn bone tumours
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Beingn bone tumours

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Beingn bone tumours

  1. 1. Beingn bone tumours
  2. 2. • Bone forming tumours: 1. Bone island 2. Osteoid osteoma 3. Osteoblastoma • Cartilage forming tumour 1. Chondroma 2. Chondroblastoma 3. Chondromyxoid fibroma 4. osteochondroma
  3. 3. • Fibrous tumours 1. Fibrous cortical defect 2. Non ossifying fibroma
  4. 4. Bone island ( aka enostosis) • Single/multiple • Always medullary in location • Normal compact lamellar bone • Uniformly dense , round/oval lesion • Chr radiating thorn like spicules • Usually <15mm , can be as large as 4cm • Periosteal new bone reaction/ cortical expansion donot occur • Normally bone island donot show increased uptake on bone scan • In patients with breast- or prostate cancer a bone island can be mistaken for an osteoblastic metastasis
  5. 5. Osteoid Osteoma • 20- 30 yrs • M:F=3:1 • Intermittent bone pain of several wks/ mnths duration occuring esp at night with dramatic releif by aspirin • Diaphysis of long bones are the site of predilection esp at proximal end of femur and tibia • Spine usually involves neural arch and not the vertebral body
  6. 6. Imaging features • Round/ oval area of radiolucency with a sclerotic margin • Radiolucency contains a small dense opacity ( nidus) • Usually prominent periosteal and endosteal reaction. • Radionuclide scan shows intense focal area of increased activity surrounded by less intense activity from reactive sclerosis • It must be differentiated from osteoblastoma, and other causes of chronic cortical thickening eg chronic sclerosing osteomyeltis.
  7. 7. Osteoblastoma • Long h/o pain at night ( relief by aspirin is not a feature) • M=F • <30 yrs • Rare lesion • MC affects spine( esp posterior arch and flat bones • A typical osteoblastoma is larger than 2 cm, otherwise it completely resembles osteoid osteoma. • There is associated reactive sclerosis • Calcification / ossification of osteoid tissue w/I tumour may cause amorphous increase in density.
  8. 8. Chondroma • single tumours are common • MC in phalanges of hand and feet • Although any bone maybe affected • Risk of malignant transformation is greatest in flat bones.
  9. 9. Imaging features: • Well defined zone of radiolucency in medulla • Small bones of hand and feet are likely to expand and thin the overlying cortex • Usually present with incidental fracture • No destruction of cortex occurs • No periosteal reaction occurs • Flecks of calcification are frequenty present w/I tumour
  10. 10. Juxtacortical chondroma • arises at the surface of the bone. • Scalloping of cortical bone is possible, • no marrow involvement. • It may be difficult to differentiate from a
  11. 11. Multiple enchondromas
  12. 12. Mafucci’s syndrome • Multiple enchondromas+ cavernous hamenagiomas in soft tissues
  13. 13. Chondroblastoma • Relatively rare • Epiphysis/apophysis • Long h/o pain • Well defined radiolucent oval lesion within epiphysis is characterisitic • Thin rim of sclerosis and cortical expansion is seen • Tumour can extend into metaphysis • Stippled calcification occurs in 50% leisons • No malignant transformation
  14. 14. Chondromyxoid fibroma • 20-30 yrs • M=F • Usually occurs around the knee • Occurs in metaphysis • Radiolucent well defined eccentric metaphysial lesion with surrounding sclerosis • Cortex maybe expanded • Calcification in lesion is extremely uncommon
  15. 15. Osteochondroma • Osseous outgrowth from bony cortex • Single>multiple • When multiple k/a diaphyseal aclasia • Very small risk of malignancy (chondrosarcoma) • Arise mainly from tubular bones near metaphysis • MC around knee , proximal end of humerus • Sessile/pedunculated • When pedunculated grows away from metaphysis being directed towards diaphysis
  16. 16. • Bony protrusions covered by cartilaginous cap • Growth in childhood takes place in the cap, • A thick cartilaginous cap in an adult is suspicious of chondrosarcoma.
  17. 17. Fibrous cortical defect • Common lesion • 2-15 yrs • MC around knee ( sp distal posteromedial femoral cortex) • Blister like expansion of cortex with thin shell of overlying bone • Always sharply defined, maybe slightly lobulated
  18. 18. • lucent intracortical defects • outlined by a thin rim of sclerosis • no involvement of the underlying medullary cavity • no periosteal reaction
  19. 19. Non ossifying fibroma • Similar to FCD except that it is much larger • 10-20yrs • MC around knee ( esp distal end of femur) • Eccentric well-defined lytic lesion with sclerotic lobulated margin. • Usually located around the knee in diaphysis or meta/diaphysis and does not occur in hands, feet, spine and flat bones. • Found as incidental finding or presents with a fracture. • The natural course is a sclerotic filling over time.
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