CNS

“ORBITAL CELLULITIS/ABSCESS”

“ Commonly, it arises due to adjacent sinusitis (also trauma, foreign body, etc.). CT •  Inflammation of the peri-orbital fat. •  With or without focal fluid collection showing rim enhancement. •  Pre-septal infection is confined to the tissues anterior to the septum (the point of attachment of the eyelid). •  Post-septal infection is usually extra-conal …

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“CEREBRAL CALCIFICATION”

“ May occur with hypo- or hyper-parathyroidism, Fahr disease, post-anoxia, neonatal AIDS or Cockayne disease. CT •  Look for calcification elsewhere, suggesting a systemic problem.” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  Join our Telegram group: Radiology Made Easy   

“PARANASAL SINUS MALIGNANCY”

“ In total, 80%-90% are SCCs.  It is often clinically silent or may present with an obstructive sinusitis and bone destruction.  Esthesioneuroblastoma is a destructive tumour arising from the olfactory nerve/neurosensory cells of the nasal mucosa and often invades the anterior cranial fossa. CT •  Soft tissue lesion typically at the fossa of Rosenmuller ” …

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“CHRONIC SINUSITIS”

“ Air-fluid levels and mild mucosal thickening is only indicative with a relevant history. Usually a viral aetiology. Complications of sinusitis include polyps, mucous retention cyst and mucocele. CT •  Opacification of the sinus/mucosal thickening.•  Sinus expands and bone remodels (bony wall may thin due to pressure necrosis).•  Peripheral enhancement.•  Complete absence of air in …

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“CHOLESTEATOMA”

“ Can be congenital or acquired. It is an epidermoid cyst in the temporal bone. The vast majority are acquired and may be complicated by erosion of the ossicles/tegmen tympani/lateral semicircular canal.The tympanic membrane is grossly abnormal and recurrence is common. Congenital cholesteatomas have an intact tympanic membrane and mass lateral to the ossicular chain.CT …

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