Upper Labial Mucosa Schwannoma: A Rare Case Report

Abstract

An upper lip swelling, asymptomatic, and benign-looking lesion may be attributed to numerous aetiologies. About 25% to 45% of Schwannomas/Neurilemmomas occur in the head and neck region and are seldom seen in oral sites, accounting form only 1% of cases. Herein, the authors presented a case report of a 36-year-old female patient with a clinical appearance of upper labial mucosa swelling is mentioned, which mimicked a mucocele. It was a single, smooth, oval, fluctuant, and non tender swelling. Complete surgical excision was performed following proper protocol, and histological diagnosis revealed a well-outlined lesion enclosed within a fibrous capsule. The connective tissue mass of the tumour consisted predominantly of neural tissue arranged in Antoni A structures, characterised by a palisaded nuclear arrangement and the presence of distinctive eosinophilic Verocay bodies. Another area with a myxoid appearance, representing Antoni B structure, was also present, suggesting a Schwannoma/Neurilemmoma. During follow-up, complete healing with no recurrence of swelling was observed. Schwannomas/Neurilemmomas in the head and neck region are less common, particularly in the oral cavity. According to various studies, the occurrence of neurilemmomas in the intraoral aspect accounts for only 19.24% of cases, specifically involving the mucosa of the lip. Practitioners should consider this rare entity of Schwannoma/Neurilemmoma when evaluating an upper lip swelling routinely.

Keywords

• immunohistochemistry
• neurilemmoma
• upper lip swelling
• verocay bodies