25.05.2021:
A man in his late forties was examined for suspected cancer of the anal canal with spreading to inguinal lymph nodes. When biopsies failed to confirm malignant disease, other differential diagnoses had to be considered. A previously healthy man in his late forties consulted his doctor about a lump in his anus. He believed it had been there for about a year, but had not been bothered by it and had assumed that it was a haemorrhoid. In recent weeks, however, he had noticed rectal discharge, initially clear but later blood-tinged, and for the past two weeks he had also been aware of a painful...