Calculators

Adrenal adenoma vs. non-adenoma at CT

Pre-contrast HU:

Post-contrast HU (60-75 sec):

Delayed phase HU (15 min):

 

Absolute washout:  

Relative washout:  

 

Text Module

 

Additional Info

Caveat: Washout measurements may be the same in adenomas and metastases from hypervascular extraadrenal primary tumors, e.g. renal cell carcinoma (RCC) or hepatocellular carcinoma (HCC).

Caveat: Markedly decreased sensitivity (66.7%) of washout measurements in large adenomas (≥ 3 cm).

Sources
  • Caoili EM, Korobkin M, Francis IR, et al. Delayed enhanced CT of lipid-poor adrenal adenomas. Am J Roentgenol. 2000 Nov;175(5):1411-5. DOI:10.2214/ajr.175.5.1751411
  • Choi YA, Kim CK, Park BK, et al. Evaluation of adrenal metastases from renal cell carcinoma and hepatocellular carcinoma: use of delayed contrast-enhanced CT. Radiology. 2013;266 (2): 514-20. DOI: 610.1148/radiol.12120110
  • Park SY, Park BK, Park JJ, et al. CT sensitivity for adrenal adenoma according to lesion size. Abdom Imaging. 2015 Oct;40(8):3152-60. DOI: 10.1007/s00261-015-0521-x