Brain mri reports

Brain MRI Reports
Item to be fulfilled:
 Ventricular system
 Mid line structures
 Cerebral parenchyma
 Posterior fossa structures
 Cortical sulci and extra axial CSF spaces
 Para nasal sinuses
 Some of the expressions will be changed.
Normal brain without contrast
Normal size and configuration of the ventricular system.
 No mid line shift.
 No intra cerebral or extra axial areas of abnormal signal.
 Normal posterior fossa.
OR Normal appearance of the brain stem and cerebellum.
OR No evidence of posterior fossa abnormalities.
 Scanned para nasal sinuses are clear.
Normal brain with contrast
 No intra cerebral or extra axial areas of abnormal signal or enhancing
lesions.

 Scanned paranasal sinuses are clear.
Normal Brain [Trauma]
 No intra cerebral or extra axial hemorrhage or blood degeneration
products.
Normal posterior fossa.
 No fracture lines seen.
NB If fractures are present mention the site (frontal, parietal, …) and type
(fissure, depressed, comminuted,….). when subgalial hematoma is
present it should be mentioned.
Normal Brain (Sinusitis)
 Normal size and configuration of the ventricular system.
 No intra cerebral or extra axial areas of abnormal signals.
 Partial or total obliteration of ........ sinuses by mucosal thickening showing
low signal in T1 and high signal in T2WI denoting sinusitis [mention the
affected sinuses, maxillary, ethmoidal...,].

Normal brain old age
 Symmetrical dilatation of the ventricular system with prominence of the
extraaxial CSF space.
 No intra cerebral or extra axial areas of abnormal signal.
 Scanned para nasal sinuses are clear.
Abnormal Brain
To describe a lesion you should mention the following points:
• Definition [well defined, ill- defined]
• Shape [oval, rounded, irregular…]
• Size [-----x------x------ cm in maximal AP, transverse and cranio
caudal diameters respectively]
• Site [intra axial, extra axial, frontal,parietal, …..]
• Surrounding edema [If present]
• Mass effect which includes
o effacement of the cortical sulci
o Compression of the ventricle
o Midline shift
• Signal intensity in T1, T2 and FLAIR images
possibilities include:
Low T1 high T2 [many lesions]
High T1 high T2 [subacute blood]

Low T1 low T2 [vessels, calcium, ...]
High T1 intermediate T2 [fat,...]
Intermediate T1 and T2 [some lesions]
 Intra cerebral hemorrhage
 A well defined, oval shaped area of blood signal is seen in the …..
[Mention the site of the lesion]. It showed ……….
• If blood is recent [intermediate signal in T1WIs with very dark signal
in T2WIs].
• Early sub acute blood [high signal in T1WIs and dark signal on
T2WIs] [intracellular met HB].
• Late sub acute blood [high signal in all pulse sequences]
[Extracellular met HB].
• Chronic blood [very dark signal in all pulse sequences]
[hemosidren].
NB In cases of hematoma with mixed signal either you say
• The hematoma showed mixed signal intensities , its major part
showed ….. in T1WIs and ……. In T2WIs, while the smaller part
showed …. In T1WIs and …… in T2WIs.
OR  The hematoma showed mixed signal intensities, it's central part
showed …… in T1WIs and ….. in T2WIs while it's peripheral part
showed …… in T1WIs and …. In T2WIs.
NB In case you see a black line surrounding the hematoma you say a rim
of persistent low signal in all pulse sequences is seen surrounding the
hematoma denoting hemosidren formation.
NB A narrow zone of peripheral brain edema my be identified around the
hematoma showing low signal in T1WIs and high signal in T2WIs.

The lesion measures ----x ----x --- cm maximal AP, transverse and
craniocaudal diameters respectively.
The lesion exerts a mass effect in the form of effacement of the cortical
sulci ± compression of the ipsilateral ventricle ± contra lateral shift of the
midline structures.
Normal posterior fossa (if the lesion is not in the posterior fossa).
Scanned paranasal sinuses are clear.
 Extra axial hemorrhage
A well defined extra axial (elliptical or cresentic shaped) hematoma is seen in
the …… (Mention the site of the lesion).
It showed ……….. Mention the signal changes in T1 and T2WIs as described
with the intra cerebral hematoma however,
• The subdural hematoma may show sedimentation level, then you
mention the signal changes of its upper and lower components.
• No edema is present in cases of epidurall or subdural hematoma.
• No hemosidren seen in there cases [usually].
 Sub arachnoid hemorrhage is not assessed by MRI, if so, you can follow
the same items used for CT and remember to change the densities to
signal intensities.
Fresh blood signal is seen smearing the cortical sulci and extra axial CSF
spaces ± extension into the ventricular system showing dark signal in T2 WIs
NB You cannot see acute subarachnoid blood in T1 WIs
Also mention that the ventricular system is dilated denoting the presence of
communicating hydrocephalus which is usually seen in cases of subarachnoid
hemorrhage.
Normal posterior fossa (if the lesion is not in the posterior fossa).

Scanned paranasal sinuses are clear.
 Brain infarction
 A well defined area of abnormal signal intensity is seen in …. [mention the
site of the lesion]. It showed low signal in T1WIs and high signal in T2 and
FLAIR images.
 Not included [we do not usually measure the size of the infarct]
 No intra cerebral or extra axial hematoma or blood degradation produce .
OR foci of blood signal are seen within the lesion in cases of hemorrhagic
infarction. The blood signal you will see is either
• Acute blood [intermediate signal in T1 and dark signal in T2]
[Deoxy HB] OR
• Sub acute blood [high signal in both T1 and T2WIs] [extra cellular
met HB].
 Normal posterior fossa [if the lesion is not in the posterior fossa].
Lacunar infarction
 A small well defined lesion of abnormal signal intensity is seen …..
[Mention the site of the lesion]. It showed low signal in T1WIs and high
signal in T2 and FLAIR WIs and exerts no mass effect on the adjacent
structures.
NB Old lacunar infarct will show low signal in T1 and FLAIR images with
high signal in T2WIs [CSF signal].
NB The same rule is applied for cases with multiple infarcts.
 Normal size and configuration of the ventricular system with no midline
shift.

OR Symmetrical dilation of the cerebral ventricles with prominence of
extra axial CSF spaces [in old patients with brain atrophic changes]
No intra cerebral or extra axial hemorrhage or blood degradation products.
Normal posterior fossa [if the lesion is not in the posterior fossa].
 Sub cortical arteriosclerotic encephalopathy
 Exaggerated periventricular white matter signal intensity in all pulse
sequences denoting sub cortical ischemic changes.
NB Lacunar infarcts may be seen in cases with subcortical arteriosclerotic
encephalopathy, then you describe these infarcts as mentioned before.
 Normal size and configuration of the ventricular system with no midline
shift.
OR Symmetrical dilation of the cerebral ventricles with prominence of
extra axial CSF spaces [in old patients with brain atrophic
changes]
 No intra cerebral or extra axial hemorrhage or blood degradation products.
 Normal posterior fossa [if the lesion is not in the posterior fossa].
 Scanned paranasal sinuses are clear
Space occupying lesion [tumor, abscess,…]
Points to be evaluated:
• Definition (well defined, ill-defined)
• Shape (rounded, oval, irregular, …)
• Size----x ----x ----cm in maximal AP, transverse and cranio caudal
diameters respectively

• Site (frontal, temproparietal , …, brain stem, cerebellum,..)(Left or right).
• Enhancement (no, homogenous, heterogenous, marginal, …)
• Surrounding edema (if present)(grade I,II,III) Low signal in T1 and
high signal in T2 WIs
∗ Grade I = area less than 2 cm around the lesion
∗ Grade II = area more than 2 cm but less than 1/2 the cerebral
hemisphere in which the lesion is present.
∗ Grade III = area more than 1/2 the cerebral hemisphere in which
the lesion is present
• Mass effect which includes:
∗ Effacement of the cortical sulci
∗ Compression of the ventricle
∗ Midline shift.
Meningioma
 A well defined oval shaped SOL is seen in the …. [Mention the site of the
Lesion]. It showed low signal in T1WIs and high signal in T2WIs.
NB Some meningioma shows intermediate signal in both T1 and T2WIs
NB Some meningiomas may contain low signal foci within the tumor mass
representing calcification or signal void blood vessels.
 The lesion measures …x…..x….. cm in maximal AP, transverse and
crainio caudal diameters respectively and showed homogenous pattern of
contrast enhancement.
NB An enhancing dural tail may be identified and should be mentioned. A
localized area of calverial bone thickening may be seen at the base of
the meningioma, this area will show persistent low signal in all pulse
sequences [bone sclerosis similar to cortical bone].
 The lesion is surrounded by grade --- perifocal brain edema showing low
signal in T1 and high signal in T2 WIs.
The lesion and edema exert a mass effect in the form of -------, --------, -----

 Normal posterior fossa (if the lesion is not in the posterior fossa).
 Scanned Para nasal sinuses are clear
OR Scanned Para nasal sinuses showed mucosal thickening in the
----,----- (mention the name of the affected sinuses ) denoting sinusitis.
Space occupying lesion
Astrocytoma / Glioma
 A well defined [or an ill – defined], ------[mention the shape of the lesion
oval, irregular,…] shaped SOL is seen in the -----[mention the site of the
lesion]
 If the lesion is not enhanced then write [Showing no evidence
of post contrast enhancement]
OR Showing heterogenous (or marginal) enhancement with central
areas of necrosis and breakdown.
OR The lesion is mainly cystic with an enhancing mural nodule
measuring….cm in maximal transverse diameters [mention the
measurement of the cyst and nodule]
 The lesion is surrounded by grade------- perifocal brain edema showing low
signal in T1 and high signal in T2 WIs. The lesion and edema exert a
mass effect in the form of -------, ----------, ----------
 Normal posterior fossa (if the lesion is not in the posterior fossa).
----,------ (mention the name of the affected sinuses ) denoting sinusitis.
Space occupying lesion
Metastatic deposits
 Multiple well defined SOLs are seen in -----[mention the site of the
lesions] [cerebral hemisphere, both hemisphere, cerebellum, brain stem,

infratentonial, supratentorial, both……].
The lesions range in size between -------[the smallest lesion] and -------[the
largest lesion] and showed -------- [mention the pattern of enhancement.
The largest lesion measures ----- x ----- cm in maximal diameters and is
located in ---- [mention the site of the largest lesion].
 The lesions are surrounded by variable degrees of perifocal brain edema
showing low signal in T1 and high signal in T2 WIs. The lesions and
edema exert a mass effect in the form of -------, -------, ------
 Normal posterior fossa [if no lesions in the posterior fossa].
--,------ (mention the name of the affected sinuses ) denoting
sinusitis.
NB A solitary metastatic deposit (a patient known to have primary
malignancy is described in the same way as glioma).
Cyst
A well defined cystic SOL is seen in the ------
Ex. Arachnoid cyst is usually present in the inferior temporal region
against the greater wing of the sphenoid bone.
Ex. Epidermoid cyst is usually located in the cerebellopontine angle.
Ex. Dermoid cyst is usually located in the midline and contains fat.
 The lesion measures -----X----- cm in maximal diameters and showed low
signal in T1 and high signal in T2 WIs with no post contrast enhancement
[if the patient was injected with IV contrast]
NB Matrix calcifications are not usually seen in MR images
If present they may show low or high signal in T1 [depending on the
mobility of the hydrogen protons], however they will show low signal in
T2 WIs

NB Dermoid cysts usually contain fat, then you have to say that the lesion
contains fat signal which appeared high in T1 and intermediate in T2
WIs.
NB Colloid cysts are usually diagnosed by their location in the midline
plane in the region of the anterior part of the 3rd
ventricle.
Colloid cyst can show any signal in T1 [hypo or hyperintense] and any
signal in T2 [hypo or hyperintense] with no contrast enhancement.
Sometimes marginal enhancement is seen in the cyst which shows low
signal in T1 WIs.
 Most of the cysts are not surrounded by edema, but they exert a mass
effect, then you have to mention the manifestation of the mass effect in the
form of ------, -----, ------.
NB Colloid cyst may be associated with hydrocephalus due to compression
of the foramina of monro.
NB In cases of dermoid cysts please look for fat globules in the
subarachnoid spaces (sulci, fissures, cisterns) as well as in the
ventricles. If they are present this means that the cyst has ruptured into
the subarachnoid space. Fat globules will appear bright in T1 WIs
NB Hydatid cyst is described following the steps mentioned for glioma.
NB In cases of porencephalic cyst you should mention it's communication
with the ventricular system.
 Normal posterior fossa [if no lesions in the posterior fossa].
sinusitis.

Acostic neuroma
 A well defined SOL is seen in the ------- [left or right] cerebellopontine
angle region extending inside the adjacent internal auditory canal which is
widened [or not]
The lesion measures ---- x ---- in maximal transverse diameters and shows
low or intermediate signal in T1 WIs and high signal in T2 WIs with
homogenous or heterogenous pattern of contrast enhancement.
The lesion is associated [or not] with widening ± pressure erosion of the
ipsilateral internal auditory canal.
Crainiopharyngioma
 A well defined partly cystic and partly solid SOL is seen in the supra sellar
area with it's main bulk exactly in the midline plane [or slightly to the left or
right of the midline]
 The lesion measures ---- x ---- in maximal transverse diameters
The cystic component showed low signal in T1 and high signal in T2 WIs
while the solid component showed intermediate signal in both T1 and T2
WIs with homogenous or heterogenous pattern of contrast enhancement.
NB The cystic component may show high signal in T1 and T2 WIs due to
its high protein content [this finding can help in the diagnosis of
carniopharyngioma]
NB Note that the enhancement in craniopharyngioma is variable, the cystic
component usually shows marginal or no enhancement while the solid
component usually shows homogenous or heterogenous
Enhancement. The foci of calcification may not be seen on MR images.
 Usually there is no edema, but mass effect is may be present in the form
of compression of the 3rd
ventricle with consequent obstructive
hydrocephalic changes of both lateral ventricles.

NB The lesion may extend inside the sella [best seen in coronal images]or
may extend into the para sellar area or even into the posterior fossa via
the pre pontine cistern (rare)… These extensions should be mentioned
 Normal posterior fossa. If the lesion has extended into the posterior fossa
then you can say : No evidence of cerebellar or brain stem parenchymal
lesions
sinusitis.
Space occupying lesion
Suprasellar meningioma, dermoid, …..
are described following the steps mentioned for craniopharengioma with
careful attention to the difference in the enhancement pattern and the degree
of mass effect as well as the variable extensions.
Intrasellar pituitary adenoma
 A well defined intrasellar SOL is seen extending (or not) into the supra
sellar cistern.
 The lesion measures ----x ----x ---- cm in maximal diameters and shows
intermediate signal in T1 and T2 WIs with homogenous or heterogenous
pattern of enhancement [mention the type of enhancement].
NB The extensions of the lesion should be mentioned in details specially
the supra sellar extension with obliteration of the suprasellar cistern [if present
best seen in the coronal images], compression of the hypothalamus [also
seen in the coronal images better than CT scan] Extension into the
suprasellar area may also compress and streach the optic chiasm. These
findings should be mentioned in the report.

Parasellar extension into the cavernous sinuses and affection of the internal
carotid arteries should be mentioned
NB Extension into the cavernous sinus is diagnosed by the presence of
tumor tissue lateral to the internal carotid artery.
NB Also mention that the internal carotid artery is patent showing normal
signal void [usual finding].
NB Infrasellar extension with erosion of the sellar floor and invasion of the
sphenoid sinus indicate that the adenoma is invasive then you mention
in the conclusion of the report that the adenoma is invasive and do not
say malignant .
 Usually there is no edema, but mass effect may be present in the form of
compression of the 3rd
ventricle with consequent obstructive hydrocephalic
changes of both lateral ventricles.
 If there is no retrosellar extension, you mention that the posterior fossa
structures are normal
OR Scanned Paranasal sinuses showed mucosal thickening in the
sinusitis.
NB In cases of microadenoma you can say
 A well defined small focal lesion is seen within the ----- (left or right) aspect
of the pituitary gland.
 The lesion usually shows less enhancement compared o the normal
pituitary tissue and may be associated with the following:
∗ Focal contour bulge of the superior or inferior surface of the
pituitary gland (best seen in coronal images).

∗ Deviation of the infundibular stalk to the opposite (or may be to
the same side)(also seen in coronal images).
 The lesion is totally enclosed within the sella with no extrasellar
extensions, no edema, and no mass effect.
 Mention that the cerebral parenchyma and ventricles appear normal with
no midline shift, also mention that the posterior fossa
structures are normal
sinusitis.
Intracranial calcification
• Most of the intracranial calcifications are not usually seen on MR
images
• CT is the examination of choice in these cases
• In cases of gyral calcification, MR is usually helpful in detection of
associated vascular malformation as well as the enlargement of the
ipsilateral choroids plexus.
Aneurysm
A well defined rounded ------x----- cm [mention the measurements of the
lesion] lesion is seen in the ------- [mention the site] common sites include:
• Suprasellar region to the left or right of the midline plane
• Within the sylvian fissure.
• In the prepontain cistern [basilar tip aneurysm]
 The lesion showed signal void in all pulse sequences denoting patent
lumen.

NB If the lesion is more than 2cm in diameter [gaint aneurysm] it may
show internal thrombosis then you can say that the lesion showed
variable signal intensities in all pulse sequences with characteristic
layring due to turbulence of flow clearly seen in T2 WIs.
The patient lumen show signal void in all pulse sequences while the
thrombosed lumen showed mixture of low and high signals
representing the stages of intraluminal clot [deoxy- Hb, met- Hb,..]
Normal size and configuration of the ventricular system with no midline
shift.
 Normal posterior fossa (if no lesions are present in the posterior fossa ).
sinusitis.
Aneurysm rupture
A well defined rounded ------x----- cm [mention the measurement of the
lesion] lesion is seen in the ------- [mention the site] common sites include:
• Suprasellar region to the left or right of the midline plane
• Within the sylvian fissure.
• In the prepontain cistern [basilar tip aneurysm]
 The lesion is surrounded by an irregular shaped area of recent blood
signal [intermediate signal in T1 and dark signal in T2
WIs] measuring -------X ------- cm in diameters
NB We do not usually inject contrast in these cases
 The ventricles are usually dilated and may contain fresh blood signal then
you can say: mild or moderate symmetrical dilatation of the supra and
infratentorial cerebral ventricles ± periventricular edema due to retrograde

transependymal CSF permeation ± intraventricular recent blood signal
seen in the ------------ (mention the affected ventricles).
 If blood is present in the 4th ventricle then you can say : normal
appearance of the brain stem and cerebellum, but do not write the usual
statement.
sinusitis.
Arteriovenous malformation
 A well defined area of abnormal vascularity is seen ----- [mention the site
of the lesion] showing serpigenous signal void vascular channels.
 Perifocal brain edema may present and a mild mass effect may be also
seen then you should mention these findings.
NB Ischemic areas in the region of the AVM will appear of low signal in T1
and high signal in T2 WIs due to direct shunting of blood from the
arterial to the venous side.
shift.
sinusitis.
Cavernous hemangioma
 A well defined intraaxial lesion of abnormal signal is seen---- [mention the
site of the lesion]

The lesion showed high signal in all pulse sequences with a well defined
margin of marked hypointensity specially noted in T2 WIs.
The lesion measures -------X ----- cm in maximal diameters and showed no
appreciable post contrast enhancement.
NB Minimal perifocal brain edema may be present around the lesion, then
mention it and say showing low signal in T1 and high signal in T2 WIs.
NB No mass effect exerted by the lesion, if present you can say that the
lesion exerts minimal mass effect on the adjacent structures.
NB In case of multiple lesions, you start to described the largest one [as
mentioned above], then you say multiple similar lesions are seen in ----
[mention the site of each lesion]
shift.
sinusitis.
 Intra ventricular lesions
A well defined --------- shaped (mention the shape of the lesion) is seen -----
(mention the site of the lesion).
Possible sites include:
• Centered on the region of the 4th ventricle midline posterior fossa.
• Within the body or frontal horn of the lateral ventricle (left / right).
• Centered at the anterior aspect of the 3rd ventricle.

 The lesion showed intermediate signal in T1 WIs with high signal in T2 WIs
and homogenous/ heterogenous pattern of post contrast enhancement
with ± foci of matrix calcifications. The surface of lesion appeared smooth
or lobulated.
The ipsilateral ventricle is dilated with ± per ventricular edema due to
retrograde transependymal CSF permeation.
NB In cases of choired plexus papilloma , the whole ventricular system is
dilated due to communicating hydrocephalus secondary to CSF over
production by the lesion.
NB If the tumor has penetrated the wall of the ventricle it will initiate brain
edema around, then maliganent transformation is suspected.
sinusitis.

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