Rare coexistence of multiple osteochondromas and solitary osteoid osteoma: A case report

Katsuki,Ryo; Oshiro,Hiromichi; Aoki,Yusuke; Mizuta,Kohei; Tome,Yasunori; Nishida,Kotaro

doi:10.3892/mco.2023.2711

Rare coexistence of multiple osteochondromas and solitary osteoid osteoma: A case report

Authors:
- Ryo Katsuki
- Hiromichi Oshiro
- Yusuke Aoki
- Kohei Mizuta
- Yasunori Tome
- Kotaro Nishida
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Affiliations: Department of Orthopedic Surgery, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
Published online on: December 15, 2023 https://doi.org/10.3892/mco.2023.2711
Article Number: 13
Copyright: © Katsuki et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Multiple osteochondromas (MOs) are inherited in an autosomal‑dominant manner, with a penetrance of ~96 and 100% in female and male patients, respectively. Osteochondromas primarily involve the metaphyses and diaphyses of long bones, including the ribs. Osteoid osteomas account for ~3 and 11% of all bone tumors and benign bone tumors, respectively. Furthermore, the male‑to‑female ratio is 2‑3:1, and they generally occur in the long bones of the lower extremities, with the femoral neck being the most frequent site. The present study describes the case of a 16‑year‑old male patient with a bony mass around the left knee joint and pain in the left calf. Radiography revealed MOs in the upper and lower extremities, while computed tomography showed a nidus in the cortex of the tibial shaft. The patient's family history included the presence of MOs, and the patient was diagnosed with MOs and a solitary osteoid osteoma. Surgical excision of the osteochondroma and curettage of the osteoid osteoma in the proximal tibia and tibial shaft, respectively, were performed simultaneously. Postoperative pathological examination revealed osteochondroma and osteoid osteoma. Furthermore, the pain resolved, and no recurrence was observed 7 months post‑operation. To the best of our knowledge, no reports exist on coexisting MOs and osteoid osteoma; therefore, the present study describes the first case of such a condition. Marginal excision for osteochondroma and curettage for osteoid osteoma effectively improved the symptoms.

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