Objective: To evaluate the prevalence of normal variants of the intra-abdominal arteries detected by computed tomography angiography in Songklanagarind Hospital.

Material and Method: Retrospective review of all patients who underwent computed tomography angiography (CTA) of the abdominal aorta from January 2010 to January 2011 was made. Data analysis was performed using frequency and percentage. The kappa coefficient was used to evaluate the agreement between three radiologists who interpreted the variation of intra-abdominal arteries. Types of the hepatic artery were classified by Michels’s classification.

Results: 340 CTA of the abdominal aortas were included in this study. The most common variation of the hepatic artery was type 2, which was found in 34 patients (10%). The most common origin of the right inferior phrenic artery was from the aorta, which was found in 116 patients (38.8%). The most common origin of the left inferior phrenic artery was from the celiac artery, which was found in 133 patients (49.4%). Double renal arteries were the most common normal variation of the renal artery. Precaval renal artery was found in 11 patients (3.2%). Overall of kappa value in this study was 0.740-1.000.

Conclusion: Type 2 was the most common variation of the hepatic artery. Most common variation of the left inferior phrenic artery was that originating from the celiac artery. Double renal arteries were the most common type of renal artery variation.