Acrosyndactyly with epidermoid inclusion cysts: evidence for the extrinsic theory

Case of constriction band syndrome with annular epidermal cyst

Both intrinsic and extrinsic theories have been proposed to explain the etiology of congenital constriction band syndrome. The authors report a case of construction band syndrome in which an epidermal cyst was involved. It was located along the annular band of the affected finger and formed a complete ring. This case suggests that the epidermal cyst was produced by circumferential compression, advocating the extrinsic theory for this syndrome.