Atypical Proliferating Trichilemmal Tumor

**Semantic type:** Neoplastic Process

**Definition:** A proliferating trichilemmal tumor with atypical morphological characteristics and absence of metastatic potential.

**Synonyms:** - Atypical Proliferating Pilar Tumor - Atypical Proliferating Tricholemmal Tumor - Intermediate Proliferating Pilar Tumor - Intermediate Proliferating Trichilemmal Tumor - Intermediate Proliferating Tricholemmal Tumor