Chordee is a birth defect of the penis. It causes the penis to be curved downward during an erection.

The Male Reproductive System
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Chordee occurs when the baby is developing in the womb. It is sometimes due to a shortened urethra or having thick tissue around the urethra. The urethra is the tube that connects the bladder to the outside of the body so that urine can exit. Other times, the problem may be due to the skin on the bottom side of the penis being too short.