What is a small penis considered pathological?

Patient's question:

What size penis is considered pathological? There are many reports of micropenis in clinical practice, and I don't know the specific categories of pathological micropenis. Here I ask, what kind of micropenis is considered pathological?

Doctor's answer:

Pathological micropenis is mainly caused by:
(1) Hypogonadism with high gonadotropin levels, where the hypothalamus and pituitary are normal and can issue strong commands, but the testes are diseased and unable to execute the commands to produce hormones and sperm.
(2) Hypogonadism with low gonadotropin levels, where the hypothalamus and pituitary are affected and cannot issue instructions to secrete testosterone.
(3) Partial androgen insensitivity syndrome, where the penis is insensitive to androgens. The patient's testosterone levels are normal, but secondary sexual characteristics are abnormal, and urethral duplication may occur.
(4) Idiopathic micropenis, where the cause or etiology remains unknown.

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