[ Neurosurgery ] Brain tumor 3

Convexity meningioma – features

May be totally calcified on CT, with psammoma bodies.

Parasagittal meningioma – vascular risk

Superior sagittal sinus venous thrombosis.

Parasagittal meningioma – location and presentation

Near the motor cortex, causing Jacksonian seizures, contralateral weakness, and foot drop.

Olfactory groove meningioma – presentation

Signs and symptoms of raised ICP.

Foster Kennedy syndrome – features

Ipsilateral anosmia, ipsilateral optic disc atrophy, and contralateral papilledema.

Cerebellopontine angle tumors – nerves and most common type

Affect CN 7 and 8, most commonly vestibular schwannoma.

Primary CNS lymphoma – type and population

Non-Hodgkin B cell lymphoma in immunocompromised patients.

Primary CNS lymphoma – distribution

Multilevel involvement (hemisphere, spine, eyes).

Primary CNS lymphoma – imaging

Homogeneous multiple lesions on CT, ring-enhancing lesion on MRI.

Primary CNS lymphoma – why called ghost tumor

It disappears with steroids.

Hemangioblastoma – significance

Most common primary intra-axial posterior fossa tumor in adults.

Posterior fossa lesion in an adult – first step

Rule out metastasis first.

Hemangioblastoma – association

Sporadic or linked with VHL.

Von Hippel-Lindau – genetics

Autosomal dominant, deletion of the VHL gene on chromosome 3p.

Von Hippel-Lindau – associations (examples)

Hemangioblastomas, angiomatosis, and renal cell carcinoma.

Cerebral metastasis – location

Most commonly at the gray-white matter junction, mostly supratentorial, single or multiple.

Cerebral metastasis – imaging

Vasogenic edema on CT, ring-enhancing lesion on MRI.

Brain metastases most likely to bleed (examples)

Choriocarcinoma, melanoma, and renal cell carcinoma.

Choroid plexus papilloma – location

Infratentorial in adults, supratentorial (lateral ventricles) in children, more common on the left.

Choroid plexus papilloma – hydrocephalus mechanism

Communicating, from increased CSF production, decreased absorption, and obstruction of flow.