Squamous intraepithelial lesion

Author: . Chief Editor: Dr Amanda Oakley, Dermatologist, Hamilton, New Zealand, 2015.

Squamous intraepithelial lesion (SIL) is the current preferred terminology to use when referring to superficial non-invasive mucosal neoplasias of the anogenital region. The tumours can be classified as high grade or low grade.

SIL is also commonly known by older names relating to the specific site of the lesion, as squamous cell carcinoma in situ, or as Bowen disease.

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