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"Making a Drug You Hope No One Will Ever Need". Regeneron Pharmaceuticals.
Partial bifid diphallia without associated anomalies
A 15-year-old boy, apart from having two penises, had normal external genitalia. His two testicles were within normal scrotum and normally positioned. He had two unequal sized glans at tip of a thick penile shaft, and only urinated through the larger glans. He had a patent anus, one bladder, one normal urethra, normal gastrointestinal and genitourinary systems. Cause
Cause of diphallia is unknown, and also because its associated anomalies vary largely, it is impossible to give a simple, single explanation of its cause. But it is thought to have started from duplication of cloacal membrane in early embryonic development stages in the fetus, between third and sixth week of gestation, because normal development of cloacal folds in the fetus is complete between this time.Normal development of penis occurs with the fusion of cloacal tubercles at anterior end of urogenital sinus. Mesenchyme migrate around cloacal membrane, proliferate and expand around cloacal plate, forming a pair of cloacal folds that fuse to form genital tubercle which develops into penis. If cloacal membrane is doubled, mesenchyme will migrate and surround both cloacal membranes, leading to the formation of two pairs of cloacal folds around two cloacal membranes, resulting in formation of two genital tubercles and thus two penises. The concept of caudal duplication syndrome is used to explain the symptoms of diphallia with associated complex anomalies in lower abdomen and urinary tract.