PMC5574474_01
Macroscopic findings. The height of the left longitudinal arch appears decreased (black arrowheads) because of a soft-tissue mass on the medial aspect of the sole (black asterisk). The point of tenderness detected at the distal end of the tarsal tunnel (X).
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The pain in the medial aspect of her left sole occurred when she attempted ankle dorsiflexion and hindfoot eversion. The weightbearing exam revealed flattening of the arch consistent with pes planus (Figure 1).
CT findings. CT scans show significant hypertrophy of the abductor hallucis muscle (black asterisks) and slight hypertrophy of the flexor digitorum brevis muscle (black arrowheads) in the left foot in (a-c) coronal planes and (d) horizontal planes.
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Magnetic resonance imaging (MRI) and computed tomography (CT) scans revealed significant hypertrophy of the abductor hallucis muscle and slight hypertrophy of the flexor digitorum brevis muscle in the left foot (Figure 2).