The image demonstrates an example of Amniotic Constriction Band syndrome, also known as Streeter's syndrome. The band depth varies from a superficial skin constriction to strangulation of the distal limb.
Most cases are sporadic.
Streeter proposed a genetic predisposition. Recent reports suggest that interference with embryonic circulation in the first month of gestation can derange the graded expression of organizational genes resulting in local defects in the organization of the embryo. Others suggest that amniotic bands alone cause the constrictions. Band excision and Z or V-Y plasty repair may suffice for soft tissue lesions. Club feet in association with constriction bands are relatively rigid and difficult to treat.