[Therapeutic and diagnostic problems in a patient with a pelvic tumour--case report].

Colorectal cancer has become the commonest form of cancer in gastrointestinal (GI) tract and nowadays it is the second cause of death among all malignant tumours. Bladder cancer is the fourth commonest tumour in males and eighth in females. In the article we present the case of 72-year-old patient with pelvic tumour and accompanied diagnostic and therapeutic problems. Despite repeated colon and bladder biopsies no malignancy was found. The results of imaging investigations suggested a bladder-derived tumour (from a bladder diverticulum or persisting urachus). An inflammatory tumour was also taken into consideration. The diagnosis confirmed in histological examination was adenocarcinoma of the colon. The article presents successive stages of diagnosis and therapy.