A boy with<unk>  caused by pellagra. The<unk>  or<unk>  necklace is a clinical sign in which there is an erythematous pigmented skin rash in the distribution of a broad<unk>  (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<unk> , who first described pellagra.
Casal collar
Bone collar
Cervical collar
SAM splint
Mandibular advancement splint
Spinal board
Glossectomy
Endoclip