Colonic leiomyoma

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Colonic leiomyoma, also leiomyoma of the colon, is a rare tumour of the colon.

Leiomyomas, in general, are dealt with in the leiomyoma article.

General

Gross

  • +/-Polypoid mass.

Microscopic

Features:

  • Spindle cells arranged in fascicles.
    • Fascicular appearance: adjacent groups of cells have their long axis perpendicular to one another; looks somewhat like a braided hair that was cut.

DDx:

IHC

  • SMA +ve.
  • Desmin +ve.
  • CD117 -ve.
  • S-100 -ve.

References

  1. Hirasaki, S.; Suwaki, K.; Tada, S.; Goji, T. (2010). "Pedunculated leiomyomatous polyp (pedunculated leiomyoma) of the transverse colon.". Intern Med 49 (22): 2519-20. PMID 21088361.