Hemiscrotal agenesis: new variation in a rare anomaly.

Scrotal agenesis is a rarely encountered developmental anomaly of the scrotum, with only 6 cases of complete agenesis reported in published studies. We report, to our knowledge, the first case of hemiscrotal agenesis. The specific embryologic basis of scrotal agenesis is unknown but is likely multifactorial, involving localized androgen insensitivity, localized 5α-reductase deficiency, and/or failure of labioscrotal fold formation.