Congenital Unilateral Hypertrophy of the Foot Intrinsics: A Rare Case and Review of Literature.

Introduction: Congenital hypertrophy of the intrinsic muscles of the foot is a rare disorder of unknown incidence characterized by unilateral muscular hypertrophy of one or more of the intrinsic muscles. Few cases have been reported in literature, many presenting with hypertrophy of a single muscle.

Case Report: A 12-year-oldCaucasian female with hypertrophy of all intrinsic muscles of the right foot present since birth presented with muscle imbalance resulting in hammer toe deformities of the second and third toes with the second toe crossing over the hallux. Our treatment consisted of the correction of the toe deformities without muscle debulking or excision.

Conclusions: Isolated congenital hypertrophy of muscles poses a unique challenge, particularly involving musculature of the foot. Indications for intervention include pain or functional impairment. Specific treatments should aim to address patient complaints with the understanding that debulking procedures carry the risk of abundant scar formation, neurovascular injury, and functional deficits.