Osteosarcoma in a Young Patient

Figures

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  Figure 1. Electrocardiogram Findings Twelve-lead electrocardiogram showing sinus rhythm at 70 beats/min, complete right bundle branch block, left anterior hemiblock, and T-wave inversion in leads V1 to V3.

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  Figure 2. Intraoperative Findings Surgical specimen showing a lobulated intracardiac tumor mass attached to the tricuspid subvalvular apparatus, without evidence of myocardial infiltration, allowing complete resection.

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  Figure 3. Histopathologic Findings (Low Magnification) Hematoxylin-eosin staining (10×) demonstrating spindle-shaped hyperchromatic cells with prominent nucleoli at the periphery, embedded within a myxoid stroma.

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  Figure 4. Histopathologic Findings (High Magnification) Hematoxylin-eosin staining (40×) showing chondroid cells with hyperchromatic nuclei, some binucleated, with vesicular chromatin and pleomorphic features, consistent with metastatic osteosarcoma.

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  Visual Summary. Multimodality Evaluation of Cardiac Metastasis From Osteosarcoma A 17-year-old patient with a history of osteosarcoma presented with dyspnea and palpitations. Multimodal imaging including transthoracic and transesophageal echocardiography and cardiac magnetic resonance identified a heterogeneous intracardiac mass involving the tricuspid subvalvular apparatus. Surgical resection was performed, and histopathology confirmed metastatic osteosarcoma. This case highlights the importance of multimodality imaging in the diagnosis and management of intracardiac masses.