Zosteriform lentiginous naevus with ipsilateral rigid cavus foot.

A patient is presented with a rigid cavus deformity associated with a painful linear keratotic lesion on the lateral plantar border. A unilateral zosteriform lentiginous naevus is found on the same side as the foot deformity. Electrodiagnostic evaluation suggests the presence of a non-specific neuromuscular process on the affected side. This association has not previously been reported.