The urachus is a tube-like structure that forms in a developing embryo. It connects the umbilical cord to the urinary bladder before birth. After birth, the urachus usually shrinks into a small ligament. However, traces of the urachus (called urachal residues) can be detected in up to one-third of adults. Urachal residues usually do not cause any symptoms.
A growth of cancerous cells that starts in the urachus is called urachal cancer. Urachal carcinoma is rare and comprises 0.35 to 0.7 % of all bladder cancers and 22-35% of vesical adenocarcinomas.
The male patient, 61 years old. When he had made regular check-ups, accidentally discovered a tumor near the bladder. The patient did not have abdominal pain, no hematuria, no painful urination, and no fluid excretion in the umbilicus.
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