%0 Journal Article %A Hideyuki Sakurai %A Norio Mitsuhashi %A Kazushige Hayakawa %A Hideo Niibe %T Giant Cell Tumor of the Thoracic Spine Simulating Mediastinal Neoplasm %D 1999 %J American Journal of Neuroradiology %P 1723-1726 %V 20 %N 9 %X Summary: A case of giant cell tumor of the thoracic spine simulating mediastinal neoplasm was identified on plain films, CT scans, MR images, and with scintigraphy. CT showed a hypervascular soft-tissue mass with shell-like calcification in the right upper mediastinum. MR imaging showed a collapse of the T1 vertebral body and a mass extending to the mediastinum. The mass had a low signal on T1-weighted MR images and a predominantly high signal on T2-weighted images with heterogeneity. Technetium-99m methylene diphosphonate bone scintigraphy showed intense uptake in both the T1 and marginal parts of the mediastinal mass. There was no accumulation of gallium-67 citrate, but 18-fluorine fluorodeoxyglucose positron emission tomography showed marked uptake. The variation in these imaging findings played an important role in the differential diagnosis of this uncommon mediastinal mass. %U https://www.ajnr.org/content/ajnr/20/9/1723.full.pdf