Kamla, age 48 yrs, presents with unilateral mild axial proptosis. There is no redness or pain. Investigation of choice is -
T3 & T4 measurement to rule out thyrotoxicosis
CT scan to rule out meningioma
Doppler to rule out hemangioma
USG to rule out orbital pseudotumor
Most common cause of proptosis in adult is thyroid ophthalmopathy and most cases are due to graves’ disease (thyrotoxicosis). Therefore T3 & T4 measurement should be done.