Congenital lateral upper lip sinus: a rare case.

Congenital lateral sinuses of upper lip are malformations with uncertain etiology. These blind sinuses through orbicularis oris muscle have no intra-oral communication, with surgical excision being treatment of choice. We present our case referred to us as a patient of posttraumatic salivary fistula. Surgical management and possible etiology is discussed briefly. Also highlighted is the importance good history taking and meticulous clinical examination to accurately diagnose the entity in order to avoid expensive supportive radiological investigations.