Value of dynamic contrast-enhanced CT combined with MRI in differential diagnosis of adrenal adenoma and metastatic tumor

Objective To investigate the clinical significance of dynamic contrast-enhanced computed tomography (CT) combined with magnetic resonance imaging (MRI) in differential diagnosis of adrenal adenoma and metastasis. Methods 120 patients with adrenal adenoma who were examined by enhanced MRI and enhanced CT before operation were collected. According to the pathological examination after operation, they were divided into adrenal adenoma group (86 cases) and adrenal metastasis group (34 cases). The difference of time-density curve between the two groups was compared, and the diagnostic criteria were evaluated by using receiver operating characteristic (ROC) curve. Results Dynamic CT and dynamic MRI were mainly type A, followed by type C, B, D and E. Dynamic CT and dynamic MRI were mainly type B, followed by type D/E, type A and type C. There were significant differences in type A, B, C, E dynamic CT and dynamic MRI between the two groups (P 0.05). The AZ value of adrenal adenomas ranged from 0.714 to 0.825 and that of adrenal metastasis ranged from 0.872 to 0.965 at 3-30 minutes delay. Conclusions Dynamic contrast-enhanced CT combined with MRI in patients with adrenal adenoma and metastasis has a time-density difference, 5min has high discriminant value in time lapse. Key words: Image enhancement; Tomography, X-ray computed; Magnetic resonance imaging; Adrenal gland neoplasms