Skip to main content Accessibility help
×
Home
Hostname: page-component-684899dbb8-mhx7p Total loading time: 0.452 Render date: 2022-05-19T05:06:32.517Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "useRatesEcommerce": false, "useNewApi": true }

6 - Micropenis

Published online by Cambridge University Press:  15 February 2010

Amanda Ogilvy-Stuart
Affiliation:
University of Cambridge
Paula Midgley
Affiliation:
University of Edinburgh
Get access

Summary

Clinical presentation

Micropenis:

  • Incidental finding on newborn examination.

  • Finding on examination of an hypoglycaemic baby.

Definition

Penile size: measured from the pubic tubercle to tip of the stretched penis in a term baby is usually >3 cm. Micropenis is a measurement <2.2–2.5 cm (varies with ethnicity).

In the preterm baby the normal penile length (cm) is 2.27 + 0.16 GA, where GA is the gestational age in weeks.

Approach to the problem

History:

  • Family history of ambiguous genitalia.

  • Ethnic origin.

Examination:

  • Dysmorphism.

  • Midline defects: hypertelorism, cleft palate.

  • Ophthalmic examination: Optic nerve hypoplasia/septo-optic dysplasia.

  • Symptoms/signs hypothalamic–pituitary hormone deficiencies (see Chapter 7).

Differential diagnosis

  • Normal variant.

  • Anterior pituitary hormone deficiency.

  • Ambiguous genitalia (see Chapter 8).

  • Syndromes, such as CHARGE association, Prader–Willi syndrome.

Investigations

  • Investigate as for hypopituitarism (see Chapter 7).

  • It is essential to do pre-feed blood sugars until normal and stable.

  • Temperature.

  • Ultrasound of head for midline defects.

  • Anterior pituitary hormone levels:

  • – Adrenocorticotrophic hormone (ACTH) and cortisol.

  • – Growth hormone (GH) (insulin-like growth factor (IGF-I), insulin-like growth factor binding protein-3 (IGFBP3)).

  • – Luteinizing hormone (LH) and follicle stimulating hormone (FSH).

  • – Thyroid-stimulating hormone (TSH) and free thyroxine (fT4).

  • Magentic resonance imaging (MRI) of the head.

  • Karyotype.

  • Genetics opinion.

  • Investigate as for ambiguous genitalia if appropriate (see Chapter 8).

Type
Chapter
Information
Publisher: Cambridge University Press
Print publication year: 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

  • Micropenis
  • Amanda Ogilvy-Stuart, University of Cambridge, Paula Midgley, University of Edinburgh
  • Book: Practical Neonatal Endocrinology
  • Online publication: 15 February 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511544736.007
Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

  • Micropenis
  • Amanda Ogilvy-Stuart, University of Cambridge, Paula Midgley, University of Edinburgh
  • Book: Practical Neonatal Endocrinology
  • Online publication: 15 February 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511544736.007
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Micropenis
  • Amanda Ogilvy-Stuart, University of Cambridge, Paula Midgley, University of Edinburgh
  • Book: Practical Neonatal Endocrinology
  • Online publication: 15 February 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511544736.007
Available formats
×