Squamous metaplasia

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Bronchial squamous metaplasia. H&E stain. (WC/Yale Rosen)

Squamous metaplasia, abbreviated SM, is a benign transformation of an epithelium to a squamous morphology.

Immature squamous metaplasia is important to recognize, as it can histologically mimic high-grade squamous intraepithelial lesion (HSIL).

It is seen in a number of contexts - including:

See also


  1. Miranda, MC.; Mazur, MT. (May 1995). "Endometrial squamous metaplasia. An unusual response to progestin therapy of hyperplasia.". Arch Pathol Lab Med 119 (5): 458-60. PMID 7748076.