Diagnostic value of CT and MRI in myxoid soft tissue tumours / 中华放射学杂志

ABSTRACT

Objective To study the CT and MRI characteristics of myxoid soft tissue tumours.Methods Fifty-three myxoid soft tissue tumours pathologically confirmed were retrospectively studied.MR and CT scan were performed before operation.Noncontrast T1 and T2 weighted images,fat-suppressed T2 weighted images were obtained before contrast-enhanced scan with fat-suppressed T1 weighted sequence was underwent.Plain and contrast-enhanced CT was performed with tube potential of 120 kV,matrix 512 × 512,and automatic tube current modulation technique.Results There were 18 myxoid liposarcoma,3 ganglioneuroma,8 myxofibrosarcoma,2 extraskeletal myxoid chondrosarcoma,10 intramuscular myxoma,and 2 juxta-articular myxoma.Microscopic examination showed myxoid soft tissue tumours which were consisted of abundant myxoid stroma with tumour cells and blood vessels associated with fibrous bands.Low density in CT images,hypointensity in T1 weighted images,significantly hyperintense in T2 weighted images were their common manifestations in the area of abundance of extracellular myxiod matrix.Plain CT images demonstrated equidensite,T1 weighted images isointensity,and fat-suppressed T1 weighted images significant enhancement relatively in the areas of increased number of tumor cells.Hemorrhage,necrosis and capsule of the lesion were revealed in high grade malignant tumors.The septa can be identified in most of myxoid tumours of soft tissue.Conclusion CT and MRI can definitely show the image characteristics of myxiod soft tissue tumours,which can help make a qualitative diagnosis before operation.