Mediastinal Leiomyoma

**Semantic type:** Neoplastic Process

**Definition:** A benign smooth muscle neoplasm arising from the mediastium. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern.

**Synonyms:** - Leiomyoma of Mediastinum - Leiomyoma of the Mediastinum