Anorchia or microorchidia

**Definition:** A disorder affecting males, caused by an abnormality occurring in sex development during the antenatal period. This disorder is characterised by individuals who are born with absence of the testes, or with testes that are deficient in size and function. Confirmation is by physical examination, identification of low testosterone levels but elevated follicle stimulating hormone and luteinizing hormone levels in a blood sample, or imaging.