Thoracolith Mimicking Pulmonary Osteosarcoma Metastasis

Résumé fourni par la source

A thoracolith is a small (~5 to 15 mm) smooth calcified nodule typically found incidentally in the pleural space on chest radiographs or CT scans.Its key characteristic is mobility between imaging studies.While it is a benign entity, it can rarely cause a diagnostic dilemma.In this context, we present a patient with high-grade extraosseous osteosarcoma with a thoracolith mimicking pulmonary osteosarcoma metastasis.Herein, we highlight the importance of comparing prior imaging studies to determine if there has been any positional change-indicating mobility-and diagnostic of a thoracolith, thereby obviating unnecessary workup or intervention. BACKGROUNDWe present a case of a patient with high-grade extraosseous osteosarcoma of the left thigh with a new calcified pleuropulmonary nodule during follow-up chest CT imaging.It was initially suspected to be metastatic osteosarcoma.However, simply comparing previous and subsequent follow-up chest CT studies, it was determined to be a thoracolith demonstrating mobility-the crucial diagnostic feature-throughout multiple follow-up chest CT studies.

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