Orbital lesions of childhood include all of the following except
Correct Answer: Secondary orbital meningioma
Description: Meningiomas: These are invasive tumours arising from the arachnoidal villi. Meningiomas invading the orbit are of two types: primary and secondary. (a) Primary intraorbital meningiomas: These are also known as 'optic nerve sheath meningiomas'. These produce early visual loss associated with limitation of ocular movements, optic disc oedema or atrophy, and a slowly progressive unilateral proptosis. During the intradural stage, it is clinically indistinguishable from optic nerve glioma. However, the presence of opticociliary shunt is pathognomonic of an optic nerve sheath meningioma. (b) Secondary orbital meningiomas: Those intracranial meningiomas which secondarily invade the orbit either arise from the sphenoid bone or involve it en route to the orbit. Orbital invasion may occur through : floor of anterior cranial fossa, superior orbital fissure and optic canal. Meningioma enplaque, affecting the greater and lesser wings of sphenoid and taking origin in the region of pterion, is the most common variety affecting the orbit secondarily. These tumours typically occur in middle- aged women. Ref:- A K KHURANA; pg num:-395,396
Category:
Ophthalmology
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