Casal collar

The Casal collar or casal necklace is a clinical sign in which there is an erythematous pigmented skin rash in the distribution of a broad collar (dermatomes C3 and C4). It is seen in patients with pellagra,[1] as a result of niacin (vitamin B₃) deficiency.

A boy with casal collar caused by pellagra.

The sign is named after Gaspar Casal, who first described pellagra.

References

Barry G. Firkin, Judith A. Whitworth. Dictionary of Medical Eponyms. Informa Health Care, 2001, page 60. ISBN 978-1-85070-333-4.

External links

Image of Casal collar at phoenity.com Accessed on 22 March 2009.

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[1] Barry G. Firkin, Judith A. Whitworth. Dictionary of Medical Eponyms. Informa Health Care, 2001, page 60. ISBN 978-1-85070-333-4.