An unusual mastoid lesion.

The article describes the case of a three-year-old child reported to the ear, nose and throat (ENT) outpatient department of a hospital with the chief complaints of left ear discharge for the last six months and post-auricular swelling gradually increasing over a period of time for the past four months. Topics include description of the ear discharge, findings on ear examination, and a final diagnosis of Langerhans cell histiocytosis (LCH) of mastoid.