Geant Solitary Osteochondroma of Distal Femur Managed with Complete Excision: A Case Report

Case Report

Geant Solitary Osteochondroma of Distal Femur Managed with Complete Excision: A Case Report

Daoudi M ^*

Department of Traumatology - Orthopedics, Avicenna Military Hospital. Marrakech. Morocco.

*Corresponding Author: Daoudi M, Department of Traumatology - Orthopedics, Avicenna Military Hospital. Marrakech. Morocco.

Citation: Daoudi. M. (2025). Geant Solitary Osteochondroma of Distal Femur Managed with Complete Excision: A Case Report, Clinical Case Reports and Studies, BioRes Scientia Publishers. 11(1):1-3. DOI: 10.59657/2837-2565.brs.25.285

Copyright: © 2025 Daoudi. M, this is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Received: October 16, 2025 | Accepted: October 30, 2025 | Published: November 06, 2025

Abstract

Osteochondromas are benign bone tumors that usually occur between the ages of 10 and 30. An osteochondroma or exostosis is a benign bone tumor consisting of a bony outgrowth covered by a cartilage cap that occurs commonly in the metaphysis of long bones (distal femur, proximal tibia, proximal humerus) and pelvis. We describe an unusual case of a osteochondroma affecting the distal fémur of a young boy.

Keywords: osteochondroma; distal femur; complete excision

Introduction

Osteochondromas are the most common benign bone tumors, accounting for 20-50% of benign bone tumors and 9% of all bone tumors [1,2]. The majority are solitary and occur due to sporadic mutations, which is different from multiple osteochondromas which is an autosomal dominant trait [3].

Case Report

We present the case of 18-year-old young man who consulted us for pain and bone swelling above the Right knee joint, which had persisted for 4 years. At the outset, the swelling presented as compact, painless, and featured a firm osseous texture. associated pain and limitations in knee movement were observed at 90° degrees. Clinical examination revealed an oval-shaped osseous mass originating from the anteromedial aspect of the lower end of the left femur (Figure 1).

Conventional radiographic images of the left femur, encompassing the knee joint, illustrated a pedunculated osseous mass originating from the anteromedial region of the lower extremity of the left femur. The tumor demonstrated continuous alignment with the femur (Figure 2).

The patient underwent surgery using an anteromedial approach to the distal femur, during which the tumor was exposed and resected end bloc (Figure 3, 4).

Figure 1: Clinical picture of tumour.

Figure 2: Face knee radiographillustrated a pedunculated osseous mass.

Figure 3: Intraoperative picture of Osteochondroma with Perichondrium

Figure 4: Total excision of osteochondroma

Discussion

Osseocartilaginous exostoses are bony protuberances enveloped by a cartilaginous layer, appearing only during the growth period. Although their congenital origin brings them closer to hamartomas, they are categorized as benign bone tumors. Two clinical forms have been identified: solitary exostoses and existing disease [4]. Osteochondromas are frequently observed in adolescents and more rarely in newborns. In the case of solitary exostosis, there is no disparity between the sexes. These tumors show a marked preference for the metaphyseal side of the growth plate, which is in full activity. Frequently, X-rays and CT scans deliver precise diagnostic insights, facilitating the anatomical characterization of the lesion [5]. In imaging, osteochondromas typically present as pedicles or projections resembling sessile bone. Recurrence of exostosis is exceptionally rare and usually occurs when fragments of the cartilage cap remain after excision. For this reason, excision must be performed extraperiosteally. Moreover, recurrence should raise concerns about possible malignant transformation [6.7].

Conclusion

Osteochondromas, prevalent benign bone tumors, usually manifest with cosmetic changes and symptoms arising from mechanical compression of adjacent structures. Any abrupt enlargement associated with pain should raise concerns about potential malignant transformation.

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