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Ophthalmology · Orbit: lymphatic malformation
Sample itemA 6-year-old suddenly develops painless proptosis after an upper respiratory infection. MRI shows a multicystic lesion with fluid-fluid levels. What is the diagnosis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Orbital lymphatic malformation with haemorrhage
Lymphatic malformations can expand suddenly with haemorrhage, giving chocolate cysts, often after respiratory infection. Capillary haemangioma presents in infancy and regresses. Rhabdomyosarcoma grows over days to weeks, and dermoids are slow, unilocular cysts.
Option by option
A. Orbital lymphatic malformation with haemorrhage (correct)
Correct. Sudden proptosis and fluid-fluid levels fit a malformation with haemorrhage.
B. Rhabdomyosarcoma
Rhabdomyosarcoma grows rapidly as a solid mass.
C. Capillary haemangioma
Capillary haemangioma appears in infancy and is solid.
D. Dermoid cyst
A dermoid is a slow unilocular lesion with a bony fossa.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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