Abnormal Tissue Density

Size Position

Compression of one or more horns, i.e. frontal, temporal or occipital

WIDTH OF CORTICAL SULCI AND THE SYLVIAN FISSURES

WIDTH OF CORTICAL SULCI AND THE SYLVIAN FISSURES

SKULL BASE AND VAULT

Hyperostosis Osteolytic lesion Remodelling Depressed fracture

MULTIPLE LESIONS may result from

Tumour - metastases - lymphoma Abscesses Granuloma Infarction Trauma

Identify the site, and whether the lesion lies within or without the brain substance. Note the 'MASS EFFECT':

- midline shift

- ventricular compression

- obliteration of the basal cisterns, sulci

High density Blood

Calcification - tumour

- arteriovenous malformation/aneurysm

- hamartoma (Calcification of the pineal gland, choroid plexus, basal ganglia and falx may occur in normal scans.)

Low density

Infarction (arterial/venous)

Tumour

Abscess

Oedema

Encephalitis

Resolving haematoma

Mixed density

Tumour

Abscess

Arteriovenous malformation Contusion

Haemorrhagic infarct

After contrast enhancement:

Vessels in the circle of Willis appear in the basal slices. Look at the extent and pattern of contrast uptake in any abnormal region. Some lesions may only appear after contrast enhancement.

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