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The adrenal gland is a common site of disease, with an abnormality prevalence as high as 9% in autopsy series. With the increasing use of CT, adrenal lesions are frequently found in the daily practice of radiology and are diagnosed in up to 5% of CT examinations performed for varied reasons. Imaging features on CT can establish a specific diagnosis of many of these lesions, including myelolipoma, hematoma and cysts. Once a diagnostic dilemma, now adenomas can be accurately diagnosed using unenhanced CT, chemical shift magnetic resonance imaging and CT contrast washout analysis. Because the adrenal gland is also a frequent site of metastasis, recent literature has focused on imaging characterization of adrenal masses for differentiation of adenomas from metastases. In patients without known malignancy, most adrenal lesions are benign and a specific diagnosis can now be made on the basis of imaging features. It is important to understand the prevalence of adrenal abnormalities because the gland is a common site of disorders, and the increased use of cross-sectional imaging has increased the frequency of detection of adrenal lesions. The prevalence of disease is important in predicting the risk of malignancy when an adrenal mass is discovered in a patient without known cancer. Detection of adrenal gland diseases has increased substantially with the advent and widespread use of imaging techniques. Although several imaging modalities can be used, CT has a central role in both detection and differential diagnosis of an adrenal lesion. The aim of this article is to review the CT findings of adrenal gland diseases.

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Superb microvascular imaging (SMI) is an innovative color Doppler technique that is used to evaluate low-velocity blood flow in particular. Our purpose in this study was to examine the sensitivity and specificity of SMI for assessing occlusion of the hepatic artery after liver transplantation. Ninety-five prospective patients who underwent liver transplantation were included in our study between April 2014 and February 2018. The patients were assessed with color power Doppler sonography and SMI method examinations in this study. Those who were suspected of having hepatic artery occlusion were assessed with computed tomography angiography. Computed tomography angiography was used in all the patients who were suspected of having occlusion of the hepatic artery on power Doppler and SMI method. The hepatic artery was considered to be patent and have normal flow on color Doppler examination in 72 (75.7%) of the total 95 patients. The hepatic artery was not observed in 23 (24.2%) of the patients with color Doppler sonography. In 3 of those 23 patients, arterial flow was detected with power Doppler sonography (31%). The sensitivity of SMI for the detection of hepatic artery occlusion was 100%, the specificity was 97.87%, the positive predictive value was 33.33%, and the negative predictive value was 100%. Thus, SMI is a noninvasive technique that is easy to use and has high sensitivity in patients who have undergone liver transplantation. In patients who are suspected of having hepatic artery occlusion with Doppler ultrasound, SMI can detect hepatic artery occlusion without the need for invasive techniques.