Diseases

Conjoined Twins

MONOZYGOTIC TWINS who are joined in utero. They may be well developed and share only a superficial connection, often in the frontal, transverse or sagittal body plane, or they may share a partial duplication of a body structure. Alternatively, there may be a small and incompletely developed twin conjoined to a larger, more fully developed twin.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

MONOZYGOTIC TWINS who are joined in utero. They may be well developed and share only a superficial connection, often in the frontal, transverse or sagittal body plane, or they may share a partial duplication of a body structure. Alternatively, there may be a small and incompletely developed twin conjoined to a larger, more fully developed twin.

MeSH Record

Classification

Broader headings

Narrower headings

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MeSH Record

Synonyms

7 entry terms
  • Siamese Twins
  • Twins, Conjoined
  • Twins, Siamese
  • Conjoined Twin
  • Siamese Twin
  • Twin, Conjoined
  • Twin, Siamese

MeSH Record

Aspects Covered

6 allowable subheadings

Indexed with the subheadings classification, embryology, pathology, physiopathology, psychology, surgery.

MeSH Record

History Note

66

MeSH Hierarchy

Tree Number

  1. C16w.131w.085w.806w

MeSH Record

NLM Classification

QS 675

AMA Style

References

  1. National Library of Medicine. Conjoined Twins. Medical Subject Headings (MeSH). 2026. Unique ID D014428. http://id.nlm.nih.gov/mesh/2026/D014428
  2. Conjoined Twins. In: Wikipedia. https://en.wikipedia.org/wiki/Conjoined_twins
  3. Conjoined Twins. In: Wikidata. https://www.wikidata.org/wiki/Q216866