Background: The evaluation of hepatic size is a daily question in abdominal ultrasound, especially to determine the presence of hepatomegaly. In the literature, different methods of measurement are described, mostly as a subcostal measured organ diameter in one direction. This method has its limits in patients with obesity, accumulation of abdominal gas or in uncooperative patients (lack of coordinative respiration) so that alternative measurements are necessary.
Methods: In 241 patients hepatic size was first measured in two conventional sections: midclavicular line (MCL) and anterior axillary line (AAL). Additionally, we measured the organs in midaxillary line craniocaudal (MAL) by determination of the cranio-caudal diameter. In 58 patients additional computed tomography was performed due to special diagnostical reasons so that liver size in MCL could be revealed and compared with ultrasonographical values.
Results: The mean value in MCL was 10.7 +/- 2.1 cm measured by ultrasound, 11.4 +/- 3.7 cm measured by computed tomography, 14.0 +/- 1.9 cm in AAL and 14.9 +/- 2.0 cm in MAL. In 5% of the cases the liver could not be measured in the conventional subcostal sections due to obesity or masking by gas, but this was possible in MAL.
Conclusions: We revealed a good correlation of liver size in MCL between ultrasound and computed tomography, as well as in the measurement of AAL and MAL diameters. However, even in cases with difficult subcostal approach intercostal diameters allow for an accurate determination of hepatic size.
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