SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Obstructed urethra. Coloured urogram (X-ray) of the penis of a man with stenosis (narrowing, bottom) of the urethra (orange, centre). The urethra is the tube that carries urine from the bladder (top right) out of the body. Narrowing of the urethra may be due to inflammation, infection or scar tissue from surgery. It causes painful urination. Treatment is of the underlying cause.
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