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Aim To evaluate the frequency and pattern of variations in the origins of right inferior phrenic artery (RIPA) and left inferior phrenic artery (LIPA) on 256 slice multidetector computed tomography (MDCT). Materials and Methods MDCT abdominal images of 600 patients (male: 344, female: 256; mean age 56.45 ± 12.96 years) who underwent technically successful multiphase computed tomography were assessed for IPA variations with emphasis on their origins and results analyzed. Results Both IPA origins were documented in all patients. Both RIPA and LIPA originated from the common trunk in 128 (21.3%) patients. IPAs with common trunk most commonly originated from the aorta (68, 11.3%). Without common trunk RIPA most commonly originated from the aorta (225, 37.5%) and LIPA from the celiac artery (278, 46.3%). The least frequently detected IPA variations were RIPA originating from the common hepatic artery (1, 0.2%), superior mesenteric artery (1, 0.2%), and common truncus originating from left renal artery (1, 0.2%). Conclusion MDCT demonstrates the IPA origins very well, enabling planning of interventional procedures related to IPA. Without common trunk RIPA most commonly originates from aorta and LIPA from the celiac artery. IPAs with common trunk most commonly originate from aorta.

Variations in the Origins of Inferior Phrenic Arteries—An Evaluation with 256 Slice Multidetector Computed Tomography