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Gliosarcomas are rare, highly malignant (WHO grade IV) primary intra-axial neoplasms with both glial and mesenchymal elements. They are often considered a histological variant of glioblastoma (GBM) sharing a similar malignant course, prognosis and epidemiological pattern. Can be very similar to glioblastoma multiforme (GBM). There may be slight predilection towards the temporal lobes. http://radiopaedia.org/articles/gliosarcoma

A PCA infarction arises, as the name says, from occlusion of the posterior cerebral artery. Symptoms include contralateral homonymous hemianopia and quadrantic visual field defects. http://radiopaedia.org/articles/posterior-cerebral-artery-pca-infarction

Giant cell tumours (GCT) of bone (also known as a osteoclastoma) are relatively common bone tumours, usually benign and typically found in the metaepiphysis of long bones. Read more: http://radiopaedia.org/articles/giant-cell-tumour-of-bone

Schizencephaly is a rare cortical malformation that manifests as a grey matter-lined cleft extending from the ependyma to the pia mater. Schizencephaly can sometimes be bilateral, and is divided into two morphological types: open lip the cleft walls are separated and filled with CSF closed lip the cleft walls are in apposition http://radiopaedia.org/articles/schizencephaly

Choroid plexus papilloma are amazing tumours, unfortunately found mostly in children. One of the interesting tidbits is that unlike most other brain tumours, which are more common in the posterior fossa in children and supratentorial compartment in adults, this relationship is reversed; most paediatric CPP are found in the trigone of the lateral ventricle! Read more: http://radiopaedia.org/articles/choroid-plexus-papilloma-1

Case of the day: Neurocysticercosis - many 'cyst with dot sign' lesions #Radiology #MRI #neurology pic.twitter.com/YXcaZGkm

Twitter / RadiologySigns: Two left eyeballs? No, it's actually a haemangioma but pretty cool nonetheless! Courtesy of @Radiopaedia

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