The simultaneous occurrence of four primary malignant tumours.
D000230:Adenocarcinoma / Q000473:pathology*; D000236:Adenoma / Q000473:pathology*; D000368:Aged; D001344:Autopsy; D001984:Bronchial Neoplasms / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D006801:Humans; D008103:Liver Cirrhosis / Q000150:complications; D008113:Liver Neoplasms / Q000473:pathology*; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D013274:Stomach Neoplasms / Q000473:pathology*; D014134:Tracheal Neoplasms / Q000473:pathology* / Q000601:surgery