%0 Case Reports
%T FDG PET/CT and MRI Findings of Extraskeletal Myxoid Chondrosarcoma Showing a Nonmyxoid Cellular Variant.
%A Hirasawa M
%A Kikuchi Y
%A Sato K
%A Yoshida A
%A Yamamoto A
%J Clin Nucl Med
%V 49
%N 5
%D 2024 May 1
%M 38557577
%F 10.782
%R 10.1097/RLU.0000000000005146
%X <B>UNASSIGNED: </B>We present a new, extremely rare nonmyxoid cellular variant of extraskeletal myxoid chondrosarcoma. Although diagnosis is radiologically and pathologically challenging, FDG PET/CT and MRI accurately showed the malignancy and high tumor density. A 52-year-old woman complained of a left dorsal mass, which presented inhomogeneous intermediate signals on T2-weighted images, with diffusion restriction, strong enhancement, and increased accumulation of FDG (SUV max , 5.2). Although biopsy was inconclusive, a highly malignant tumor was suspected radiologically. The resected specimen was histologically diagnosed as extraskeletal myxoid chondrosarcoma by detection of EWSR1::NR4A3 fusion using fluorescence in situ hybridization.