title: [A case of squamous cell carcinoma that developed on chronic tar dermatosis].
abstract: A 79-year-old Japanese man visited our clinic for evaluation of a large tumor on the left wrist and multiple keratotic tumors. He had handled creosote oil, which is a purified product of coal tar production, for 50 years. Physical examinations revealed poikiloderma with multiple hyperkeratotic tumors on the back of his hand and forearm bilaterally, and a cauliflower-like tumor, 80 x 60 x 15 mm in size, on the left wrist. Histopathologically, the large tumor showed a proliferation of atypical squamoid cells with many keratinization foci, indicating well-differentiated squamous cell carcinoma.
authors.affiliation: Department of Dermatology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shimauchi
authors.forename: W
authors.initials: W
authors.lastname: Rikihisa
authors.forename: H
authors.initials: H
authors.lastname: Yasuda
authors.forename: O
authors.initials: O
authors.lastname: Yamamoto
authors.forename: M
authors.initials: M
authors.lastname: Asahi
mesh_terms: D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000209:etiology* / Q000473:pathology; D002908:Chronic Disease; D003033:Coal Tar / Q000009:adverse effects*; D003877:Dermatitis, Contact / Q000150:complications* / Q000473:pathology; D009783:Dermatitis, Occupational / Q000150:complications* / Q000473:pathology; D006225:Hand; D006801:Humans; D008297:Male; D012878:Skin Neoplasms / Q000209:etiology* / Q000473:pathology
chemical_list: D003033:Coal Tar