Squamous Cell Carcinoma of Unknown Primary

**Semantic type:** Neoplastic Process

**Definition:** A squamous cell carcinoma which has metastasized to another anatomic site and the original site of growth has not been identified.

**Synonyms:** - Epidermoid Carcinoma of Unknown Primary Origin - Squamous Cell Cancer of Unknown Primary Origin - Squamous Cell Carcinoma of Occult Primary Site - Squamous Cell Carcinoma of Unknown Primary Origin - Squamous Cell Carcinoma of Unknown Primary Site