Pediatric Urology Library - Micropenis
What is micropenis?
Micropenis is defined as a normally structured penis that is below the normal size range for an infant. Normally, the length of a newborn boy's penis is between 2.8 to 4.2 centimeters with a circumference of 0.9 to 1.3 centimeters. This measurement is taken by carefully stretching the penis and measuring from the tip of the penis to the base of the penis. A penis length of less than 1.9 centimeters is usually considered micropenis.
What causes micropenis?
Micropenis can occur alone, but usually occurs in combination with other disorders. Hormone disorders that cause an abnormal level of hormones which are involved in development of the sexual organs may be seen in combination with micropenis. This can involve the pituitary gland or the hypothalamus.
What are the symptoms of micropenis?
While each child may experience symptoms differently, the most common finding with micropenis is an infant penis size that is less than 1.9 centimeters when stretched gently. In some cases, low sperm count, resulting in infertility or decreased fertility, is found in adulthood. Micropenis may or may not be seen in conjunction with other disorders. Always consult your child's physician for a diagnosis.
How is micropenis diagnosed?
Diagnosis is usually made by physical examination. Your child may then be referred to several specialists including a pediatric urologist (a physician who specializes in disorders and care of the urinary tract and the male genital tract) and a pediatric endocrinologist (a physician who specializes in hormones).
Treatment for micropenis:
Specific treatment for micropenis will be determined by your child's physician based on:
- your child's age, overall health, and medical history
- the extent of the condition
- your child's tolerance for specific medications, procedures, or therapies
- expectations for the course of the condition
- your opinion or preference
There is no cure for micropenis. Hormone therapy may be indicated for some children to stimulate penile growth. Other treatment options will be discussed with you.