Objective To investigate the common and rare MRI findings of adrenal pheochromocytoma.Methods The MRI and clinical data of 62 patients with adrenal pheochromocytoma which were confirmed histopathologically at Zhong-shan Hospital,Fudan University from January 2012 to August 2019 were retrospectively analyzed.The MR image analysis of the lesion included location,size,shape,margin,homogenization,whether cystic,signal intensity of plain scan,and dynamic enhancement pattern,surrounding invasion and metastasis,etc.Results A total of 64 lesions were detected in 62 patients,with 60 cases being single lesion and 2 lesions in 2 cases each.In all lesions,28 lesions were located in the left adrenal gland,36 lesions in the right adrenal gland.The maximum diameter of the 64 lesions was 0.8 cm to 12.6 cm(mean 4.90±2.71 cm).56(87.50%)lesions were round or oval,8(12.50%)lesions were lobulated or irregular.63(98.44%)le-sions had clear boundaries and only 1 lesion had blurred boundaries.34(53.13%)lesions were solid,30(46.87%)lesions were cystic solid and 13(20.31%)lesions were highly cystic.12(18.75%)lesions were solid homogeneity,52(81.25%)lesions were heterogeneity.23(35.94%)lesions showed haemorrhages,5(7.81%)lesions contained intracellular lipid,and 3(4.69%)lesions showed CSF-like hypersignal.50(78.13%)lesions had hypointensity in T1 WI,and 14(21.87%)lesions had isointensity T1 WI;all T2 WI had hyperintensity.There were 1(1.56%)perifocal invasion,1(1.56%)lymphnodemetastasisand2(3.13%)livermetastases.Afterdynamicenhancementscan and in the arterial phase,42(65.63%)lesions showed severe enhancement while22(34.38%)lesions showed mild to moderate enhance-ment.33(51.56%)lesions contained intratoral or peritumoral tumor vessels.There were four types of lesion enhancement:16(25.00%)lesions showed"progressive filling"enhancement,12(18.75%)lesions showed"progressive uniform"en-hancement,21(32.81%)lesions showed"fast in and fast out"enhancement,and15(23.44%)lesions showed"contin-uous"enhancement.Conclusion The MRI findings of adrenal pheochromocytoma have typical common and rare features.
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