19 August 2026
: Case report 
Malignant Soft Tissue Tumor Mimicking Chronic Expanding Hematoma After a Long Clinical Course: A Case Report
Rare disease
Itaru Ogawa
ABDEF 1, Yoichi Kaneuchi ABDEF 1, Takeo Suzuki ABDF 1, Fumiya Ara BF 1, Shoki Yamada BDE 2, Osamu Hasegawa BDE 3, Michiyuki Hakozaki ABDEF 1,4*, Yoshihiro Matsumoto ADE 1
DOI: 10.12659/AJCR.953515
Am J Case Rep 2026; 27:e953515
Figure 3 Magnetic resonance imaging (MRI) findings at the re-presentationMRI shows a multilocular cystic lesion measuring approximately 15.0 × 17.6 × 10.0 cm in the distal portion of the left upper arm. The lesion has iso-to-high-signal intensity on T1-weighted images (A, axial), and slightly low-signal intensity on T2-weighted images (B, axial) and short tau inversion recovery images (C, axial). Gadolinium-enhanced MRI shows solid components with contrast enhancement adjacent to the cystic lesion (arrowheads) (D, axial; E, sagittal).