Objective: To identify the characteristic MRI findings of chronic expanding hematoma correlated with the pathology.
Design and patients: Three patients who had a chronic expanding hematoma involving the musculoskeletal system were reviewed retrospectively.
Results and conclusion: Huge soft tissue masses suggestive of malignancy with destruction of the bony structure were revealed on radiography and computed tomography. MRI showed the masses to exhibit heterogeneous signal intensity on both T1 and T2-weighted images with a peripheral rim of low signal intensity, reflecting the central zones of fluid collection due to fresh and altered blood with a wall of collagenous fibrous tissue. These MRI findings were seen in all three patients and are considered to be characteristic; they assist in differentiation from neoplasm in consideration of the history of trauma or surgery.