Hypertrophy of the Abductor Hallucis Muscle. A Report of Two Cases.

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Hypertrophy of the abductor hallucis muscle is a very rare disorder. We report two cases with a mass on the plantar surface of their foot. Case 1 was a 16 month-old girl who presented to our hospital with a difference in size of the foot which had been present from birth. On examination, flat foot was observed and a soft mass was palpated on the medial aspect of the right foot. On plain radiographs, swelling of the soft tissue was noted. CT scan showed hypertrophy of the muscle, but the muscle could not be distinguished. Biopsy examination revealed normal muscle structure. At surgery, hypertrophy of the abductor hallucis muscle was diagnosed.In the second case, a ten-month-old male, a similar difference in the size of the foot was noticed by the parents. Also in this case a soft palpable mass was found around the same site. Difference in the size of the foot size, in length and width was observed. MRI examination revealed hypertrophy of the muscle and the site of the muscle coincided with the position of the abductor hallucis muscle. However, this mass showed no signal intensity similar to tumour. Surgery was not carried out in this case.In the first case with flat foot, the cause of the hypertrophy of the abductor hallucis muscle could not clearly distinguished. However, in the second case, this may be due to hemi-hypertrophy of the foot.
西日本整形・災害外科学会の論文