# Trichoblastic Carcinoma of the Right Clavicular Region: A Case Report With a Review of the Literature

## TL;DR

A rare case of trichoblastic carcinoma on the clavicle is reported, highlighting the need for accurate diagnosis and multidisciplinary treatment.

## Contribution

This case adds to the limited literature on trichoblastic carcinoma and emphasizes its management challenges.

## Key findings

- Trichoblastic carcinoma was diagnosed via histopathology and immunohistochemistry after surgical excision.
- The case involved muscle and clavicle invasion, requiring a trapezius flap for reconstruction.
- The tumor was classified as low-grade, treated with wide local excision.

## Abstract

Trichoblastic carcinoma is a rare skin adnexal malignancy. It often resembles other skin malignancies in its gross and histopathological picture. While the definitive treatment for low-grade lesions is wide local excision, high-grade or inoperable lesions require chemo-radiation. It is important to ensure excision of an adequate clear skin margin while doing a surgical resection.

The present case reports a 75-year-old male with a malignant skin lesion on his right clavicle. Magnetic resonance imaging showed it to involve the muscles and clavicle. Preoperative biopsy showed features of a trichilemmal carcinoma.

A wide local excision of the part of the clavicle was done. A trapezius flap was mobilized to cover the defect. Histopathology and immunohistochemistry analysis confirmed the diagnosis of a low-grade trichoblastic carcinoma.

This case report aims to emphasize that trichoblastic carcinoma can be considered one of the differentials of skin adnexal malignancies, and it needs a multidisciplinary approach to manage such rare malignancies.