Patients with primary aldosteronism (PA) are complicated by metabolic syndrome more frequently than those without PA. Hyperaldosteronism has been reported to be associated with a higher prevalence of non-alcoholic fatty liver disease (NAFLD). We aimed to clarify the risk factors for hepatic steatosis in the two subtypes of PA, comparing the status of hepatic steatosis in each of these subtypes. This was a retrospective observational study. We enrolled patients with an aldosterone producing adenoma (APA) (n = 33) or idiopathic hyperaldosteronism (IHA) (n = 56). Hepatic fat content was evaluated using the ratio of liver to spleen (L/S) X-ray attenuation on unenhanced computed tomography. L/S ratio <1.0 was utilized for assessing as hepatic steatosis. Age, sex distribution, visceral fat percentage (VF%), and visceral fat area (VFA) did not differ between patients with the two PA subtypes. The percentages of patients with L/S ratio <1.0 was not different between the two subtypes (APA: 21.2 % (7/33) vs. IHA: 19.6 % (11/56), p = 1.00). In both subtypes, the L/S ratio negatively correlated with VF% (APA: r = -0.66, p < 0.001; IHA: r = -0.66, p < 0.001) and with VFA (APA: r = -0.44, p < 0.01; IHA: r = -0.37, p < 0.01). The status of hepatic steatosis, evaluated using L/S ratio, did not differ between patients with APA or IHA. Hepatic steatosis was affected by the amount of visceral fat.
Keywords: Computed tomography; Intra-abdominal fat; Non-alcoholic fatty liver disease; Obesity; Primary aldosteronism.