A boy with casal collar caused by pellagra.
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, as a result of niacin (vitamin B3) deficiency.
The sign is named after Gaspar Casal, who first described pellagra.
External links
- Image of Casal collar at phoenity.com Accessed on 22 March 2009.