Brown sign is seen in
Glomus tumor
Cholesteatoma
Aoustic neuroma
Hypothyroidism
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
Urology