Abstract

Micropenis refers to a normally structured penis, which is abnormally small, with a stretched length of less than 2.5 standard deviations (SD) below the mean of age or stage of sexual development. Patients with true micropenis usually have a 46,XY karyotype, associated to normally located male gonads, without any sign of other penile malformations. Penile length is measured from the point where the penis meets the pubic bone to the distal tip of the glans on maximal stretch, compressing any fat over suprapubic area. Differential diagnosis include buried penis (inability to adequately expose the penis, due to a severe phymosis associated to a decreased length of penile skin, which retain the shaft inside the preputial cavity), and obesity with excess fat pad over supra pubic area. The causes of congenital or true micropenis can be divided into three major groups: hypogonadotropic hypogonadism (pituitary/hypothalamic failure), hypergonadotropic hypogonadism (primary testicular failure) and idiopathic (associated with a functional hypothalamus–pituitary–testicular axis). Clinical treatment is based on testosterone therapy. Surgical treatment options are used after failed penile enlargement with testosterone therapy and include penile elongation, suprapubic fat pad aspiration and eventually neophaloplasty.

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