Pilo-leiomyoma
A benign tumor of smooth muscle (erector pili muscle).
Gross Appearance:
Solitary or multifocal
Well-circumscribed, ovoid, and firm
Histology:
Unencapsulated
Composed of interwoven fascicles of long, plump spindle to straplike cells
Abundant pink cytoplasm
Indistinct cell borders
Collagen production is negligible
Nuclei are elongate, but tend to be blunt-ended (used to distinguish from fibromas and well-differentiated
fibrosarcomas)
Mitotic figures are absent
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