Table of Contents
- Overview
- Treatment
- Prevention
- Images
A simian crease is a single line that runs across the palm of the hand. People usually have three creases in their palms.
The term "simian crease" is not used much anymore since it tends to have a negative meaning (it refers to monkey or ape). The crease is usually just referred to as a single palmar crease.
Alternative Names
Single palmar crease; Transverse palmar crease; Palmar crease
Considerations
Strong lines (called palmar flexion creases) appear on the palms of the hands and soles of the feet. The palm usually has three of these creases. But sometimes, the horizontal creases join together to form a single one.
Palmar creases develop while the baby is growing in the womb, usually by the 12th week of
A single palmar crease appears in approximately 1 out of 30 people. Males are twice as likely as females to have this condition. Some palmar creases indicate problems with development and are associated with disorders like Down syndrome.
Common Causes
A single palmar crease is often a normal finding. However, it may also be associated with:
Down syndrome Aarskog syndrome - Cohen syndrome
Fetal alcohol syndrome Trisomy 13 Rubella syndrome Turner syndrome Klinefelter syndrome Pseudohypoparathyroidism Gonadal dysgenesis Cri du chat syndrome
Images
Review Date: 12/10/2010
Reviewed By: A.D.A.M. Editorial Team: David Zieve, MD, MHA, and David R. Eltz.
Previously reviwed by Neil K. Kaneshiro, MD, MHA, Clinical
Assistant Professor of Pediatrics, University of Washington School
of Medicine (5/12/2009).
A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)
