A benign smooth muscle neoplasm arising from the trachea. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. The disease is Monarch Disease Ontology identifier MONDO_0002318 (trachea leiomyoma). Also known as: leiomyoma of the trachea, leiomyoma of trachea, tracheal leiomyoma.