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Classification according to ICD-10
Q55.6 Other specified congenital malformations of the male genital organs
ICD-10 online (WHO version 2019)

Macropenis is the medical name for an anatomically unusually large penis .

The opposite is known as a micropenis .

Synonyms : macrophallia; Macrophallus; Megalopenis; Megalophallus

A penis length of 2.5 standard deviations above the age-related mean is considered unusually large in newborns .

root cause

This is based mostly an abnormally elevated plasma levels of testosterone , but can also as an isolated anomaly occur.

A macropenis can occur in some syndromes :

Clinical manifestations

The clinical feature is an abnormally large penis, either during or shortly after birth, always before puberty .


  • D. Dayal, AK Bhalla: Cut-offs for stretched penile length in neonates. In: Indian journal of endocrinology and metabolism. Volume 19, number 1, 2015 Jan – Feb, p. 189, doi: 10.4103 / 2230-8210.146882 , PMID 25593854 , PMC 4287772 (free full text).
  • AA Kassim, H. Umans, RL Nagel, ME Fabry: Megalophallus as a sequela of priapism in sickle cell anemia: use of blood oxygen level-dependent magnetic resonance imaging. In: Urology. Volume 56, Number 3, September 2000, p. 509, PMID 10962334 .
  • MA Sabry, D. Obenbergerova, R. Al-Sawan, QA Saleh, S. Farah, SA Al-Awadi, TI Farag: Femoral hypoplasia-unusual facies syndrome with bifid hallux, absent tibia, and macrophallus: a report of a Bedouin baby . In: Journal of medical genetics. Volume 33, Number 2, February 1996, pp. 165-167, PMID 8929957 , PMC 1051846 (free full text) (review).

Individual evidence

  1. ^ Medicine, Academic
  2. ^ AO Kutlu: Normative data for penile length in Turkish newborns. In: Journal of clinical research in pediatric endocrinology. Volume 2, number 3, 2010, pp. 107-110, doi: 10.4274 / jcrpe.v2i3.107 , PMID 21274323 , PMC 3005681 (free full text).
  3. ^ SR Prabhu, S. Mahadevan, R. Bharath, S. Jagadeesh, J. Kumutha, S. Suresh: Normative data for stretched penile length in term neonates born in Tamil Nadu. In: Indian journal of endocrinology and metabolism. Volume 18, number 4, July 2014, pp. 585-586, doi: 10.4103 / 2230-8210.137500 , PMID 25143923 , PMC 4138922 (free full text).
  4. ^ AS Al-Herbish: Standard penile size for normal full term newborns in the Saudi population. In: Saudi medical journal. Volume 23, Number 3, March 2002, pp. 314-316, PMID 11938424 .
  5. M. Fahmi: megalopenis. In: Congenital Anomalies of the Penis. 2017. ISBN 978-3-319-43310-3 , [1]
  6. Bernfried Leiber (founder): The clinical syndromes. Syndromes, sequences and symptom complexes . Ed .: G. Burg, J. Kunze, D. Pongratz, PG Scheurlen, A. Schinzel, J. Spranger. 7., completely reworked. Edition. tape 2 : symptoms . Urban & Schwarzenberg, Munich et al. 1990, ISBN 3-541-01727-9 .
  7. N. Okumus, A. Zenciroglu, N. Demirel, AY Bas, S. Ceylaner: Apparent Lenz microphthalmia syndrome: a patient with unusual manifestations. In: Genetic counseling. Volume 19, Number 2, 2008, pp. 177-182, PMID 18618992 .