Question

The most common orbital tumor has its origin from which structure?

• A. Blood vessels
• B. Nerves
• C. Muscle
• D. Lymph node

Hint:

Think of the most common benign intraconal mass in adults.

Answer 1

The Correct Option is A

Step 1: The question asks for the tissue of origin of the most common orbital tumor. Among orbital space-occupying lesions, benign vascular tumors are the single most frequent group.

Step 2: Cavernous hemangioma is the most common benign orbital tumor in adults. It arises from vascular tissue (blood vessels), typically lies within the muscle cone, and presents as slowly progressive painless axial proptosis.

Step 3: Because cavernous hemangioma is of vascular origin, the correct tissue of origin is blood vessels.

Step 4: The distractors are wrong because nerve-origin tumors such as optic nerve glioma and schwannoma, muscle lesions, and lymphoid (lymph node) tumors are each less common than vascular tumors as a group.