MedGen

Inability to conceive for at least one year after trying and having unprotected sex. Causes of female infertility include endometriosis, fallopian tubes obstruction, and polycystic ovary syndrome. Causes of male infertility include abnormal sperm production or function, blockage of the epididymis, blockage of the ejaculatory ducts, hypospadias, exposure to pesticides, and health related issues. [from NCI]

The inability of the male to effect fertilization of an ovum after a specified period of unprotected intercourse. Male sterility is permanent infertility. [from MONDO]

Any deviation from the normal circulation of leucine in the blood circulation. [from HPO]

A structural anomaly of a male reproductive cell. [from HPO]

A structural abnormality of the sperm tail. [from HPO]

Asymmetry of the bones of the skull. [from HPO]