PMC7490981_01
A. Plain radiograph of left ankle AP and B. lateral view C. MRI T2 image in coronal section showing high signal small (1.7 x 1.4 x 1 cm) lobulated juxtacortical cystic lesion in the anterolateral aspect of the ankle region, superficial to the distal fibula with small subperiosteal component and relative thinning of fibula. Incidental finding of simple calcaneal bone cyst also noted.
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Antero-posterior and lateral radiographs of the ankle revealed a soft tissue swelling over the lateral malleolus, without any degenerative changes (Fig. 1A). Magnetic resonance imaging showed lobulated juxta-cortical cystic lesion in the anterolateral aspect of the ankle joint with calcification and minimal wall enhancement (Fig. 1B).
A. Intra - operative images after skin and subcutaneous dissection B. Meticulous en mass dissection removing adhesions C. showing the continuity with the underlying tendon sheath.
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Intra-operatively a large encapsulated firm to hard lesion measuring 3 x 2 x 1 cm without communication to the joint or attachment to the bone was excised and sent for examination (Fig. 2).
Histopathology showing lobules of mature hyaline cartilage with foci of ossification.
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The histopathological finding was that of a benign lesion composed of lobules of mature hyaline cartilage with foci of ossification, with surrounding fibrosis and synovial tissue without any evidence of malignancy, hence suggestive of synovial chondromatosis (Figs. 3, 4).
Histopathology showing cartilage with ossification and surrounding fibrosis.
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The histopathological finding was that of a benign lesion composed of lobules of mature hyaline cartilage with foci of ossification, with surrounding fibrosis and synovial tissue without any evidence of malignancy, hence suggestive of synovial chondromatosis (Figs. 3, 4).