RESUMO
Objective To investigate the CT findings of primary abdominal dedifferentiated liposarcoma(DDL),and to improve the diagnostic accuracy.Methods CT images of 23 cases with primary abdominal DDL confirmed by pathologically were analyzed retrospectively,and the CT findings were compared with pathological results.Results The masses in 20 cases out of 23 cases were located in retroperitoneal region,2 in abdominal cavity and 1 in the pelvic extraperitoneal space.The mean diameter of the masses was 26.5 cm.CT showed the fatty and non-fatty regions in the masses.In 2 1 cases,the non-fatty region was manifested as a single mass and was located at the edge or on the surface of fatty region.In 2 cases,the non-fatty region was manifested as multiple well-defined masses and was located within the fatty region.In 2 1 cases,the fatty region showed misty density with strip and reticular septa.In 2 other cases,the fatty region showed slightly low density,mingled with some fat tissue density,which showed no enhancement with mild enhanced internal septa.In 20 cases,the non-fatty region showed soft tissue density,with mild to moderate heterogeneous enhancement.In 3 other cases,the density of non-fatty region varied between liquid and soft tissue with patchy enhancement on delayed phase.In addition,stippled calcification was found in 4 cases.Conclusion The primary abdominal DDL has relatively specific CT findings,which different dedifferentiated components pro-duce different CT characterizes.Finding well-differentiated fat components around non-fatty mass may help to improve the accuracy of diagnosis and reduce the misdiagnosis.