Imaging manifestations and pathologic basis for hepatic capsular retraction syndrome caused by benign and malignant liver tumors

Objective: To investigate the imaging manifestations of CT, MRI and pathological basis for hepatic capsular retraction syndrome caused by benign and malignant liver tumors. Methods: CT or MRI images and pathological features for hepatic capsular retraction syndrome were retrospectively analyzed in 50 patients with benign and malignant liver tumors. Picture archive and communication system(PACS) was used to observe and compare the morphology, size, width, depth, edge of the capsular retraction and the status of liquid under the liver capsule. The structure, differentiation and proliferation of the tumor were analyzed under the microscope. Results: There were malignant liver tumors in 44 patients and benign tumor in 6 patients. The smooth or rough for the edge of capsular retraction was significant difference between the benign tumors and the malignant tumors with three differentiated grades(all P0.05). There were significant difference in the width and depth for capsule retraction with different amount of fibrous tissues(all P0.05). The width and depth of capsule retraction were positively correlated to the size of the tumors(r=0.557, 0.309 respectively, both P0.05). Conclusion: Benign and malignant hepatic tumors may appear capsule retraction syndrome, but there are morphological differences between them. The differences are closely related with the lesion size, differentiated degree of tumor and fibrous tissue proliferation.