Tsai C.-M.TSEN-FANG TSAIKuo F.-S.Chen Y.-F.Hung C.-M.2020-10-222020-10-2220071027-8117https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947253416&partnerID=40&md5=8f8e4334179550874e074434af11ebf5https://scholars.lib.ntu.edu.tw/handle/123456789/517720Disseminated superficial actinic porokeratosis (DSAP) is a hereditary disease which involves mainly the extremities, especially sun-exposed areas. The typical lesions show papules or plaques with slightly atrophic centers and peripheral ridges, and the pathological features reveal characteristic cornoid lamella - a parakeratotic column on the epidermis. DSAP is not a rare disease, but the hyperkeratotic variant is uncommon. Only one case was reported previously. We report a 81-year-old man whose clinical and pathological finding was consistent with hyperkeratotic variant of DSAP. This form of DSAP is often misdiagnosed as other benign or premalignant keratosis and warrants special clinical consideration.Disseminated superficial actinic porokeratosis; Hyperkeratotic[SDGs]SDG3actinic porokeratosis; aged; article; case report; clinical examination; diagnostic error; disseminated superficial actinic porokeratosis; family history; human; hyperkeratosis; keratosis; male; onset age; skin defect; symptomjournal article2-s2.0-33947253416