Incidental detection of gastrointestinal stromal tumor by Tc-99m MDP bone scan.
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.
Department of Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA. timothy.shepherd@ucsf.edu
Timothy M
TM
Shepherd
Ibrahim A
IA
Idakoji
Miguel H
MH
Pampaloni
D000368:Aged; D001842:Bone and Bones / Q000000981:diagnostic imaging*; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000000981:diagnostic imaging*; D006801:Humans; D033162:Incidental Findings; D011877:Radionuclide Imaging; D013669:Technetium Tc 99m Medronate; D014057:Tomography, X-Ray Computed; D051598:Whole Body Imaging
D013669:Technetium Tc 99m Medronate