重複陰茎

A CASE OF DIPHALLIA

　生後6カ月の重複陰茎を有する男子に対し，副陰茎切除術を施行した。他に左腎の形成異常両側停留睾丸，陰嚢形成不全，臍帯ヘルニア，腹壁ヘルニア，腸管脱出などの合併異常を認めた。本症例は本邦報告6例目であり，Johnsonらの分類では偽性重複陰茎の完全型に属すると思われた。成因としては生殖結節となる中胚葉原基が異所性に迷入し，これより誘導されたことが推測された。

A 6 month-old boy with diphallia was described. This patient was also complicated with infraum-bilical abdominal wall hernia, intestinal prolapse, symphyseal diastasis, agenesis of the left kidney, bilateral retentio testes, and other minor anomalies. The excision of accessory penis histologically disclosed that it had a well-formed glans with a shallow depression near its tip representing blind meatus, without a corpus spongiosm and an urethra. The cause of this rare anomaly is unknown, but was supposed to be an early ectopic displacement of mesodermal anlagen of the genital tubercle in this patient.