# The Rarity in the Rarity: Presentation of Three Cases of Cutaneous Carcinosarcoma with Clinical and Histopathological Insights

## TL;DR

This paper presents three rare cases of cutaneous carcinosarcoma, a dual-component skin cancer, and discusses their clinical and histopathological features.

## Contribution

The novelty lies in presenting three new clinical cases and insights into the histopathological diversity of cutaneous carcinosarcoma.

## Key findings

- Cutaneous carcinosarcoma presents as rapidly growing, painful nodules on sun-exposed skin.
- The tumor contains both epithelial and sarcomatous components with possible heterologous differentiation.
- The rarity and varied presentation of cCS complicate its understanding and management.

## Abstract

A cutaneous carcinosarcoma (cCS) is a rare and aggressive skin cancer characterized by both carcinomatous (epithelial) and sarcomatous (mesenchymal) components, making it a biphasic tumor. Despite its occurrence in various organs, a cCS is exceptionally rare in the skin, predominantly affecting older males. The etiology of a cCS is unclear, but it may originate from a single progenitor cell capable of dual differentiation or from a collision of carcinoma and sarcoma cells. Clinically, a cCS presents as a rapidly growing, painful, ulcerated nodule or plaque on sun-exposed skin, with a high risk of local invasion and metastasis. Histopathologically, a cCS includes various epithelial components, such as squamous cell carcinoma and basal cell carcinoma, along with undifferentiated sarcomatous components resembling atypical fibroxanthoma. The tumor may also exhibit heterologous differentiation like angiosarcomatous or rhabdomyosarcomatous features. We present three cases of a cCS, highlighting their clinical and histological characteristics and comparing them with previously reported cases. Understanding a cCS is complicated by its rarity and diverse presentation, emphasizing the need for further research to elucidate its pathogenesis and optimal management.