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. 2012 May 17;2(5):516–522. doi: 10.7150/thno.3613

Figure 1.

Figure 1

A transaxial CT image without contrast enhancement shows a 5 cm homogenous circumscribed well delineated tumor in the right adrenal. The attenuation in the tumor was measured by placing a circular region of interest (ROI) in three contiguous slices and resulted in a mean attenuation of minus 15 Hounsfield Units consistent with a benign adrenocortical adenoma.