J Korean Foot Ankle Soc.  2020 Sep;24(3):120-123. 10.14193/jkfas.2020.24.3.120.

Plantar Keratosis Induced by Heterotopic Ossification under the Medial Sesamoid Bone: A Case Report

• Kim SJ
• Suh JS
• Kim JY
• Choi JY

• KMID: 2506529
• DOI: http://doi.org/10.14193/jkfas.2020.24.3.120

Abstract

Heterotopic ossification is the formation of extra-skeletal bone in the muscle and soft tissues, and an osteoma is a benign bone-forming tumor composed of compact or mature trabecular bone limited almost exclusively to the craniofacial bones. This paper reports an extremely rare case of heterotopic ossification mimicking an osteoma that occurred independently at the plantar side of the medial sesamoid bone. The patient was a 46-year-old male with a three-month history of pain and a hard mass on the plantar aspect of the left forefoot sole. After excising the lesion, the patient’s symptoms were relieved, and no pain or complications occurred. This paper discusses this exceedingly rare case of heterotopic ossification around the medial sesamoid bone with a review of the relevant literature.

Keyword

Heterotopic ossification; Osteoma; Plantar keratosis; Hallux; Sesamoid bone

Figure

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  Figure. 1 Clinical photographs show plantar keratosis at the plantar side of the medial sesamoid bone.

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  Figure. 2 Preoperative weight-bearing anteroposterior (A) and lateral (B) radiographs present the bony mass lesion under medial sesamoid. (C) On sesamoid axial image, bony mass lesion is more markedly observed.

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  Figure. 3 Sagittal (A) and axial (B) computed tomographic images show the bony mass lesion separated from the medial sesamoid bone.

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  Figure. 4 A 10×9×6 mm3 sized oval bony mass was excised.

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  Figure. 5 (A) A round exostotic tumorous lesion was removed (H&E stain scan view). (B) The mass was composed of compact lamellar bone with intraosseous Haversian systems (H&E stain, 10x).

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