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Micropenis. I. Criteria, etiologies and classification
The Johns Hopkins Medical Journal
|April 1, 1980
Summary
Micropenis, a sign of an abnormally small penis, has various causes including hormonal issues and idiopathic factors. This study defines diagnostic criteria and discusses management strategies for this condition.
Area of Science:
- Pediatric Endocrinology
- Urology
- Genetics
Background:
- Micropenis is defined as an abnormally small penis with normal configuration, serving as a clinical sign rather than a diagnosis.
- The etiologies of micropenis are diverse, encompassing hypogonadotropic hypogonadism, primary hypogonadism, androgen insensitivity, and idiopathic causes.
Purpose of the Study:
- To establish clear diagnostic criteria for micropenis.
- To outline the etiologic classification and management strategies for micropenis.
Main Methods:
- Defining micropenis based on phallic length, specifically 2.5 or more standard deviations below the mean.
- Establishing a lower limit of 1.9 cm for penile length in infants aged 0 to 5 months.
- Reviewing clinical syndromes associated with micropenis and their classification.
Main Results:
- Among 45 patients, hypogonadotropic hypogonadism accounted for 31%, primary hypogonadism for 24%, androgen insensitivity for 2%, and idiopathic causes for 7%, with 36% remaining undiagnosed.
- A phallic length 2.5 standard deviations below the mean is proposed as the abnormal threshold.
- Specific penile length criteria for infants (0-5 months) were established at 1.9 cm.
Conclusions:
- Micropenis requires a thorough diagnostic approach to determine its underlying etiology.
- Established criteria and understanding of etiologies guide the management, including sex of rearing and medical/surgical interventions.
- Further research is needed to diagnose the significant percentage of undiagnosed cases.