Primary synovial sarcoma of the shoulder: Case report of the “triple sign” on proton density magnetic resonance imaging

Mediastinal liposarcoma: Case report with radiology review

“…Lipomas appear hyperintense on MRI T1 and T2 weighted images denoting its homogenous fatty architecture, while liposarcomas exhibit low intensity on T1 images with associated larger size and thicker septa [ 3 , 8 ]. An MRI finding in sarcomas on T2 weighted sequences is the “triple sign” due to the inhomogeneity of the lesion which can be represented by low, intermediate and high signal areas within the lesion [ 9 ]. In our particular case, CT scan and MRI imaging revealed that the liposarcoma was located in the posterior mediastinum extending into the soft tissues of the posterior neck, abuts bilateral carotid arteries, and displaced the trachea and esophagus.…”

Synovial sarcoma in the prevertebral space can mimic malignant neurogenic neoplasm: Case report and literature review

“…Typical MRI findings include a large, heterogeneous mass with well-defined margins (53%-91%) and variable T1-weighted and T2-weighted signal intensity, appearing hypo-, iso-, or hyperintense compared to muscle due to different stages of hemorrhage within the lesion [ 16 , 19 , 20 ]. Therefore, a combination of cystic and solid elements with hemorrhage and fibrous tissue, known as the "triple sign," could be observed in up to 35% of cases on T2-weighted imaging [ 19 , 21 ]. Additional imaging features may include a "bowl of grapes" appearance (10%-13%), internal septa (67%-87%), cysts (29%-42%), perilesional edema (45%-75%), and neurovascular encasement (17%-24%) within the lesion [ 4 , 16 , 22 ].…”