18) reported that the volume of the contralateral descended testis was not a reliable criterion for differentiating an absent testis from an intra-abdominal testis in a boy with a unilateral impalpable testis, since in their cohort of 109 children, 80% of
monorchid patients (47% of all cohort) had a contralateral testicular size smaller than 2 cm.
Monorchidism refers to the complete absence of a second testicle--only one ever developed--and it's so rare, we've yet to find a vet who has ever seen a
monorchid dog
Equine castration: review of anatomy, approaches, techniques and complications in normal, cryptorchid and
monorchid horses.
A seminoma in a
monorchid guinea fowl (Numida meleagris).
