Preauricular Leiomyoma: A Rare Presentation of a Cutaneous Smooth Muscle Tumor

TL;DR

A rare case of a cutaneous smooth muscle tumor was found on a man's face and confirmed through surgery and biopsy.

Contribution

This is the eighth reported case of a preauricular cutaneous leiomyoma, emphasizing the need for accurate diagnosis.

Findings

A 63-year-old man had a preauricular mass confirmed as cutaneous leiomyoma via SMA staining.

Surgical excision was performed due to the unusual facial location of the tumor.

This case highlights the importance of timely diagnosis and treatment of rare cutaneous tumors.

Abstract

Cutaneous leiomyoma, also known as leiomyoma cutis, is a rare presentation of an extra-uterine leiomyoma, often found on the extremities, trunk, and genitalia. Solitary lesions rarely occur on the face. This case presents a 63-year-old man with a one-year history of a growing mass in the preauricular region. On examination, a well-defined, painless mass was noted. Given the unusual yet visible location on the face, the decision was made to excise it surgically. After surgical resection, the biopsy specimen stained positively for smooth muscle actin (SMA), confirming a cutaneous leiomyoma. To the best of our knowledge, this is the eighth reported case of a preauricular cutaneous leiomyoma and stresses the importance of an accurate diagnosis for timely surgical treatment.

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