Incidental detection of gastrointestinal stromal tumor by Tc-99m MDP bone scan |
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Authors: | Shepherd Timothy M Idakoji Ibrahim A Pampaloni Miguel H |
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Institution: | Department of Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA. timothy.shepherd@ucsf.edu |
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Abstract: | This case demonstrates extraosseous 99m-technetium methylene diphosphonate (Tc-99m MDP) accumulation from a gastrointestinal stromal tumor. A 75-year-old woman underwent a temporal bone CT for conductive hearing loss that showed sclerosis in the right occipital condyle. Follow-up Tc-99m MDP bone scan for osseous metastases instead showed a mass-like extraosseous accumulation of Tc-99m MDP in the anterior left upper quadrant. Differential diagnoses included gastric cancer, lymphoma, metastatic melanoma, systemic hypercalcemia, or heterotopic mesenteric ossification. Contrast CT showed a well-circumscribed mass arising from the stomach, and subsequent pathology confirmed gastrointestinal stromal tumor. These tumors rarely can contain osteoclast-like giant cells and should be considered for extraosseous Tc-99m MDP accumulation. |
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