Neuroradiology — Flashcards

Flashcard 21: The mnemonic for CP angle tumors is SAME:S : _____A : Aneurysm, arachnoid cystM : Meningioma, metastasesE : Epidermoid cyst, Ependymoma

Answer: Schwannoma (8th>5th)

Flashcard 22: _____ appearance may be seen in PSP at the level of superior colliculi on axial imaging

Answer: Morning Glory

Extra: In **Progressive Supranuclear Palsy (PSP)**: - **Morning Glory sign**: Seen on axial MRI at the level of the midbrain due to atrophy of the midbrain tegmentum with preserved tectum and peduncles. - **Hummingbird sign** (or Penguin sign): Seen on sagittal MRI due to midbrain tegmentum atrophy. Note: The **normal** appearance of the midbrain on axial imaging is often described as resembling **Mickey Mouse**; this appearance is altered/lost in PSP.

Flashcard 23: Expansion of the contrast-filled space in myelography is seen in _____dural extramedullary tumor.

Answer: intra

Flashcard 24: Extracanalicular extension of _____ into the cerebellopontine angle (path of least resistance) can lead to "ice-cream-cone' appearance.

Answer: acoustic neuroma

Flashcard 25: Imaging of _____ (CNS tumor) reveals a round mass attached to the dura (via a "tail")

Answer: meningioma

Flashcard 26: Acute subdural hematomas arise with _____ and appear hyper-dense on CT

Answer: trauma

Flashcard 27: Craniometric parameters used for diagnosis of basilar impression include _____ line, Chamberlain's line and McGregor's line

Answer: McRae's

Flashcard 28: In _____ weighted images, CSF is bright/hyperintense and white matter is dark, grey matter is white

Answer: T2

Flashcard 29: Double contour or bevelled edge appearance (_____ sign) and Geographic skull is seen in Langerhans cell histiocytosis

Answer: Hole within a hole

Flashcard 30: _____ sign on MRI is seen in paraganglioma

Answer: Salt and pepper