This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Brown sign is seen in 
Select and explain. 
A. Glomus tumor, B. Cholesteatoma, C. Aoustic neuroma, D. Hypothyroidism
A: Glomus tumor
Answer: A: Glomus tumor 
Explanation: Brown sign also called Pulsation sign is seen in glomus tumours. Glomus tumor is the most common benign neoplasm of middle ear; originating from the glomus bodies. It is extremely vascular. Thus, when ear canal pressure is raised with Siegel's speculum, the tumour pulsates vigorously and then blanches; reverse happens with the release of pressure. This is called Brown sign. Reference : page 109 Diseases of Ear, Nose and Throat & Head and Neck surgery - Dhingra 6th edition