Secondary chondrosarcoma from a solitary osteochondroma of the fibula head: a case report

Kasun Tharaka Kuruwitaarachchi,Dilshan Munidasa

doi:10.4038/jpgim.8307

Kasun Tharaka Kuruwitaarachchi, Dilshan Munidasa

Open Access

https://doi.org/10.4038/jpgim.8307

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Abstract

Secondary chondrosarcoma from a solitary osteochondroma of the fibula head: a case report

Highlights

Osteochondromas are the most common primary, benign tumors of the bone
Chondrosarcoma is an unusual sequel of osteochondroma, the conditions are frequent enough to deserve discussion
Ahmed et al reported 107 secondary chondrosarcomas arising in osteochondromas and found that 97 tumors were grade 1 and the rest were grade 2 [4]

Summary

Introduction

Osteochondromas are the most common primary, benign tumors of the bone. They account for nearly 35% of all primary benign bone tumors [1,2]. A plain radiograph showed a large, irregular, exophytic, postero-lateral growth localized to the head of the fibula with sclerotic margins of adjacent tibia (Figure 1). An irregular, firm, bony mass was seen to have extended from the fibular head posteriorly towards the popliteal fossa displacing the popliteal artery medially (Figure 2.1). AP and lateral view radiographs of the right knee after surgery showed evidence of a completely resected tumor mass with intact normal joint space. Morphological features were of an osteochondroma, findings such as focal areas of cellular atypia, crowding and fibrous bands, along with a 20mm thick cartilaginous cap, which are beyond the benign spectrum, are in favor of possible low grade chondro-sarcomatous changes. MRI was found to be normal one year after surgery

Discussion

Findings

Conclusion