Meningiomas are the most common extra-axial tumours of the central nervous system. They are a non-glial neoplasm that originates from the arachnoid cap cells of the meninges. Meningiomas have characteristic imaging findings although there are man.
This case shows the typical appearance of a developmental venous anomaly (DVA) with a bunch of venous vessels in a "Medusa head". They are commonly located at the angle of ventricles, especially near frontal horn of the lateral ventricles.
Melanoma is the third most common primary neoplasm that metastasizes to the brain. MRI typically hyperintense secondary to hemorrhage or melanin (as above) typically hypointense C+ (Gd): typically enhances in a peripheral rim pattern or a dif
Cerebral arteriovenous malformations (AVMs) are the most common symptomatic cerebrovascular malformations. Their most common presentation is intraparenchymal haematoma. Large AVMs are typically wedge-shaped lesions located in the watershed area.
This case demonstrates typical appearances of progressive multifocal leukoencephalopathy (PML) in a patient on HAART for HIV. It should be noted that this patient also has a high titre of BK virus, a relative of JC virus but not implicated in P.
Haemangioblatomas are tumours of vascular origin and occur both in patients with von Hippel Lindau (vHL) as well as sporadically. They are WHO grade I tumours that can occur in the central nervous system or elsewhere in the body, including kidneys, liver and pancreas. Typically haemangioblastomas are sharply demarcated homogeneous masses composed of cyst with a solid enhancing mural nodule. http://radiopaedia.org/articles/haemangioblastoma-central-nervous-system