Congenital hypertrophy of an intrinsic muscle of the foot.

Congenital hypertrophic muscles of the foot are rare and a search of the literature revealed only a few select cases on the subject. However, a case did present itself at Saint Michael's Medical Center involving a congenitally hypertrophic abductor digiti minimi muscle of the right foot. Surgical exploration also revealed slight abnormalities of the third and fourth plantar interosseous muscles. These muscles, however, were left intact because they were not symptomatic. There were no other hypertrophic muscles noticed on this foot and none in the opposite foot. Excision of the entire hypertrophic muscle eventually provided complete relief and allowed the patient to wear normal foot gear. This manuscript describes a case presentation of a single congenitally hypertrophic muscle with reference to its clinical evaluation and subsequent treatment.