ORBITS

“Capillary hemangioma of the orbit (INFANTILE)”

“ These typically regress after 2 years. They increase in size with Valsalva and large lesions consume platelets. CT •  Lobular lesion that enhances intensely MRI •  Prominent curvilinear flow voids ” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  Join our Telegram …

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“GLOBE CALCIFICATION”

“ Either bilateral (drusen—incidental and asymptomatic) or unilateral (choroidal osteoma—distal to the optic disc and associated with tuberous sclerosis). The extra-ocular muscles commonly calcify in the elderly. CT • Drusen appear as flat discs of calcification overlying the optic nerves. ” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel …

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“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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“OPTIC NERVE SHEATH MENINGIOMA”

“ Benign and slow growing, these arise from the arachnoid layer. They encircle and grow along the nerve sheath. MRI •  Mass surrounding the intra-orbital optic nerve that enhances more than the nerve itself, ‘tram track’ enhancement.•  Calcification in up to 50%.•  Look for erosion or hyperostosis of the optic canal. ” For Radiology Cases, …

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Optic nerve glioma versus meningioma

“ Optic nerve glioma Optic nerve sheath meningioma 80% <20 years of age Middle-aged women Variable enhancement ‘Tram track’ enhancement Calcification rare Calcification in up to 50% Buckling of the nerve (fusiform thickening ) Straight nerve (tubular thickening) Often asymptomatic Visual impairment early ” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe …

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