<unk>  occurs in two primary forms: Type A and Type B. * Type A: The supernumerary testicle is connected to a vas deferens. These testicles are usually reproductively functional. Type A is further subdivided into: * Type A1: Complete duplication of the testicle, epididymis and vas deferens. * Type A2: The supernumerary testicle has its own epididymis and shares a vas deferens. * Type A3: The supernumerary testicle shares the epididymis and the vas deferens of the other testicles. * Type B: The supernumerary testicle is not connected to a vas deferens and is therefore not reproductively functional. Type B is further subdivided into: * Type B1: The supernumerary testicle has its own epididymis but is not connected to a vas deferens * Type B2: The supernumerary testicle consists only of testicular tissue. Type A3 is the most common form of<unk> , and types A2 and A3 together account for more than 90% of cases. In 65% of cases, the supernumerary testicle is found in the left scrotal sac. Numeric system An older system of classification structures<unk>  into similar types, but with no subdivision between connected and disconnected testicles: * Type 1: The supernumerary testicle lacks an epididymis and vas deferens and has no connection to the other testicles. * Type 2: The supernumerary testicle shares the epididymis and the vas deferens of the other testicles. * Type 3: The supernumerary testicle has its own epididymis and shares a vas deferens. * Type 4: Complete duplication of the testicle, epididymis and vas deferens.
Polyorchidism
Microorchidism
Micrognathism
Macroorchidism
Anisomastia
Loxoscelism
Hyperdontia
Bifid penis