English

Abstract

INTRODUCTION: Isolated Thymic cysts are very uncommon lesions and are believed to account for approximately 3% of all anterior mediastinal masses (1). Thymus is derived from 3 rd pharyngeal pouches with only a small contribution from 4 th pharyngeal pouches. CASE REPORT: An upper lateral neck swelling on the left side of short duration which was diagnosed pre-operatively as, branchial cyst, in a 7 year female child. There were no symptoms of pain or obstruction. Excision biopsy was done and the histopathological diagnosis was confirmed as Thymic cyst. Embryological and histological aspect with review of literature has been done.