According to Lee et al. a micropenis is “an abnormally small penis with a normal configuration.” In other words, a micropenis has a normal anatomical configuration, but is significantly smaller than the average adult penis size (about 7cm (3 inches) flaccid and 12.5cm (5 inches) erect). The term microphallus is used to describe a penis that is both small in size and abnormal in the positioning of its urethral opening (a condition known as hypospadia).
If micropenis is present during infancy and is diagnosed as being caused by a hormone deficiency, hormonal replacement therapy is administered to facilitate genital growth.
Testosterone Therapy in Infants and Children
In cases where the condition is caused by a testosterone deficiency, testosterone therapy is generally highly effective in treating micropenis. Appropriate hormonal replacements in infants with other hormonal deficiencies (growth hormone deficiency, hypothyroidism, adrenal insufficiency).