Histological examination of the removed skin neoplasm revealed clusters and cords of atypical cells of stratified squamous epithelium, growing into the underlying tissue. What diagnosis can be assumed?

Answer options

1. Adenoma
2. Papilloma
3. Carcinoma in situ
4. Non-keratinizing squamous cell carcinoma
5. Keratinizing squamous cell carcinoma

Explanation

Skin neoplasms are poorly differentiated squamous carcinomas, they contain more pleomorphic cells and have no keratinization.