Macroorchidism is a disorder found in males where a subject has abnormally large testes. The condition is commonly inherited in connection with fragile X syndrome, which is also the second most common genetic cause of mental disabilities. The opposite side of the spectrum is called microorchidism, which is the condition of abnormally small testes.
^Álvarez-Acevedo García, M.; Molina Rodríguez, M.aA.; González Casado, I.; Nistal Martín De Serrano, M.; Gracia Bouthelier, R. (2006). "Macroorquidismo: A propósito de un caso" [Macroorchidism: a case report]. Anales de Pediatría (in Spanish) 64: 89–92. doi:10.1016/S1695-4033(06)70015-7. PMID16539923.