<prompt> Brown sign is seen inGlomus tumorCholesteatomaAoustic neuromaHypothyroidism  <response>: 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 Siegels 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 