The Value of Ultrasound in Characterizing and Determining the Etiology of Ascites

The aim of this study was to assess the role of transabdominal ultrasonography in characterizing and determining the etiology of ascites in comparison with laboratory ascitic fluid analysis and other methods used to establish the final diagnosis.

A prospective descriptive study was conducted on 61 patients with ascites attending outpatient department (OPD) or admitted to wards of Tikur Anbesa Specialized Hospital (TASH) and referred to radiology department for imaging from June 2017 to November 2017. Data were collected following the internationally recommended scanning technique in consecutive bases. The data were analyzed using SPSS version 20. The comparison of ultrasound and laboratory findings with final clinical diagnosis was analyzed using Chi-square test (X²).

Of 61 patients with ascites enrolled in this study, females were 35(57.4%) with age range of 16 to 75 and mean age of 43.2±14.11. The cause of ascites was established in 59 cases using a combination of clinical, pathological, imaging evidences and tumor markers. However there were two cases who had ascites with indeterminate cause. US suggested the diagnosis in 54(91.5%) patients. Excluding mixed and indeterminate cases, ultrasound characterized ascites correctly as exudate and transudate in 95% cases.

Ultrasound has significant accuracy to distinguish transudate and exudate ascites and in suggesting the underlying cause. It can be a valuable method of investigation of ascites in places where CT and MRI are not available, and it is the best complement for laboratory investigations on ascites in suggesting the etiology based on ascitic fluid texture and ancillary findings.