PMC4969088_01
Axial contrast-enhanced CT scan images of foot show dystrophic appearing subcutaneous calcifications scattered throughout the outlines of a well defined non-enhancing soft tissue mass-like lesion (arrows) just anterior to the head of the first metatarsal bone and metatarsal phalangeal joint with normal underlying bony structures.
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Contrast-enhanced computed tomography (CT) of the foot (Fig. 1) demonstrated dystrophic appearing subcutaneous calcifications scattered throughout the outlines of a well defined 18 x 9 mm non enhancing soft tissue mass-like lesion just anterior to the head of the first metatarsal bone and metatarsal phalangeal joint without osseous involvement.
a) Macroscopic image of the surgical specimen that consisted of one tissue fragment measuring 2.3 x 1.6 x 1.5 cm. b) Histopathological examination showing a central zone of immature fibroblastic spindle cells intersecting a myxochondroid stroma and the periphery comprised calcification and mature lamellar bone.
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The resected specimen was well circumscribed, totally seperated from the extensor hallucis longus tendon sheath and showed a distinct zonal pattern of myositis ossificans (Fig. 2a). The definitive histopathological analysis described a central zone of immature fibroblastic spindle cells intersecting a myxochondroid stroma and the periphery comprised calcification and mature lamellar bone compatible with MO (Fig. 2b).