title: A case of an occupational double tumour.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D002295:Carcinoma, Transitional Cell / Q000175:diagnosis*; D005005:Ethmoid Sinus; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis; D009784:Occupational Diseases / Q000175:diagnosis*; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis*; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis*