Tumors of the skin composed principally of smooth muscle cells (leiomyomata) are classified, according to their derivation, as follows: (A) Multiple cutaneous leiomyomas, from arrectores pilorum muscles (Fig. 1); (B) Solitary angioleiomyomas, from the walls of blood vessels, principally veins (Fig. 2), and (C) Solitary genital leiomyomas, from the muscularis sexualis or muscularis mammillae.1
Each group has clinical and histologic features as shown in the Table.
Solitary angioleiomyoma is difficult to diagnose clinically and simulates other painful small tumors of the subcutaneous tissue (neuroma and glomus tumor). In the earlier literature leiomyomata and glomus tumors were grouped together as "painful subcutaneous tubercles." According to Stout,2 the first reported case of ``leiomyomatous tuberculum dolorosum'' occurred in the subcu