title: Multiple basal cell carcinomas in two cases of ankylosing spondylitis treated with X-ray therapy.
mesh_terms: D000328:Adult; D002280:Basal Cell Carcinoma / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000209:etiology*; D009381:Neoplasms, Radiation-Induced / Q000209:etiology*; D011878:Radiotherapy / Q000009:adverse effects*; D012878:Skin Neoplasms / Q000209:etiology*; D013167:Spondylitis, Ankylosing / Q000532:radiotherapy*