[Multiple superficial basal cell carcinomas following chronic ingestion of sodium hydrogen carbonate containing arsenic].

Basal cell carcinomas (BCC) are caused by various factors such as ultraviolet light, ionizing radiation, possibly human papilloma viruses and chemical agents. Among the latter inorganic trivalent arsenic has long been recognized as an important cause of BCC. A 70-year-old woman developed multiple basal cell carcinomas mainly on the trunk after taking sodium hydrogen carbonate contaminated with arsenic for many years for chronic gastritis.