Sinonasal Undifferentiated Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** A rare, highly aggressive carcinoma that arises from the sinonasal tract. It is characterized by the presence of small to medium size malignant cells. The prognosis is poor.

**Synonyms:** - Sinonasal Anaplastic Carcinoma - Undifferentiated Sinonasal Cancer