Imaging SBAs Unit 6 Flashcards
Child, Cerebellar mass, extending into cerebellopontine angle. Intense enhancement and diffusion restriction with surrounding oedema
Atypical teratoid/rhabdoid
Primary CNS Lymphoma vs Toxoplasmosis
CNS:
Usually single lesion,
Subependymal spread,
Solid enhancement pattern
Toxoplasmosis:
Multiple lesions
Usually basal ganglia
Ring enhancement
Most posterosuperior ethmoid air cell, separated from optic nerve and ICA by very thin bone
Onodi cell
Most anterior ethmoidal air cell
Agger Nasi cell
Enhancing mass at base of tongue in midline
Lingual thyroid
Definitive Ix for herpes encephalitis
Lumbar puncture
Carotid body tumour MRI
Iso T1, High T2, multiple flow voids
Causes of high T1 in basal ganlgia
Calcification,
Haemorrhage, Wilsons, Long term TPN,
Chronic liver disease,
NF1 hamartomas
MIR signs of malignant transformation of pleomorphic adenoma
Heterogenous signal,
Irregular margins,
Lymphadenopathy,
adjacent soft tissue or bone spread,
Facial perineural spread
Pleomorphic adenoma MRI
Low T1, High T2.
Causes of visual field defects
Temporal lobe = contralateral superior quadrantinopia
Visual cortex = contralateral homonymous hemianopia
Occipital lobe = homonomous hemianopia with macula sparing
Optic chiasm = bitemporal hemianopia
Optic nerve = ipsilateral anopsia
Renal impairment, hypertension, intracranial aneurysm
ADPKD
Acute carbon monoxide poisoning MRI
High T2 signal in basal ganglia and globus pallidus with diffusion restriction
Multiple rounded cystic intracranial lesions, surrounding oedema, immunosuppressed.
Toxoplasmosis
Von-Hippel-Lindau associations
Cerebellar haemangioblastoma,
Spinal cord haemangioblastoma,
Retinal Haemangioblastoma,
Pancreatic cysts,
Renal cysts,
RCC,