Dermatopathologic features of cutaneous squamous cell carcinoma and actinic keratosis: Consensus criteria and proposed reporting guidelines.

Background: There is considerable variation in the literature regarding the dermatopathologic diagnostic features of and reporting guidelines for actinic keratosis (AK) and cutaneous squamous cell carcinoma (cSCC).

Objective: To develop consensus recommendations regarding diagnostic criteria, nomenclature, and reporting of AK and cSCC.

Methods: Literature review and cross-sectional multiround Delphi process including an international group of expert dermatopathologists followed by a consensus meeting.