Atypical Intradermal Smooth Muscle Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A rare, mitotically active spindle cell neoplasm arising from the smooth muscle in the dermis. It has an excellent prognosis, as compared to the deep soft tissue leiomyosarcomas.

**Synonyms:** - AISMN - Atypical Intradermal Smooth Muscle Tumor - Cutaneous Leiomyosarcoma - Leiomyosarcoma of Skin - Leiomyosarcoma of the Skin - Skin Leiomyosarcoma