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  • 1. The Road Less Traveled: The Often IgnoredLesser Branches of the Celiac AxisAram Lee, MDJustin McWilliams, MD UCLA Radiology

2. The Road Less Traveled: The Often Ignored LesserBranches of the Celiac AxisLearning Objectives: To highlight the clinical relevance of lesscommonly encountered vascular branches of the celiacaxis, specifically in liver-directed interventional treatment.Organization:Part 1: Review of classic hepatic arterial anatomy and commonhepatic arterial variantsPart 2: Extrahepatic collateral vessels originating from the celiacaxis which can be parasitized by liver tumorsPart 3: Extrahepatic branches arising from the hepatic arterialcirculation to recognize in liver embolotherapy 3. Part 1:CLASSIC HEPATIC ARTERIAL ANATOMYAND COMMON ARTERIAL VARIANTS 4. Conventional hepatic arterial anatomyRHALHA PHA CHA GDA61%Conventional hepatic artery anatomy; the CHA gives off the GDA and continues as the PHA, which splits into RHA andLHA. In the surgical literature, 55-70% of the population has this configuration; in the largest DSA study, 61%.Michels et al. Blood supply and antaomy of the upper abdominal organs with a descriptive atlas. Philadelphia, PA: Lippincott, 1955.Hiatt et al. Surgical anatomy of the hepatic arteries in 1000 cases. Ann Surg 1994; 220: 50-52.Covey et al. Variant hepatic arterial anatomy revisited: DSA performed in 600 patients. Radiology 2002; 224: 542-547. 5. Left hepatic arteryOrigin-Proper hepatic artery-Left gastric artery (5%)-Celiac trunk (rare, double hepaticartery)Supplies -Segments 2 and 3, and sometimes 4Recognized by -Arch over L portal vein-Distribution to L lobe of liverCovey et al. Variant Hepatic Arterial Anatomy Revisited: DSA Performed in 600 Patients. Radiology. August 2002. 224: 542-547. 6. Right hepatic arteryOriginProper hepatic arterySMA (12%)Celiac trunk (double hepatic artery)DestinationSegments 5-8Recognized byDistribution to right lobe of liverCovey et al. Variant Hepatic Arterial Anatomy Revisited: DSA Performed in 600 Patients. Radiology. August 2002. 224: 542-547. 7. Replaced or accessory right hepatic artery Replaced right hepatic artery (12%)-No right hepatic artery from PHA-Instead originates from the SMA,or rarely the right phrenic artery orother Accessory right hepatic artery (5.5%)-Right hepatic artery from PHA-Second right hepatic artery fromelsewhere-Usually SMA Replaced RHA from SMA-Also GDA, LGA, celiac axis,right phrenic arteryHiatt et al. Surgical Anatomy of the Hepatic Arteries in 1000 Cases. Annals of Surgery. July 1994. 220: 50-52.Covey et al. Variant Hepatic Arterial Anatomy Revisited: DSA Performed in 600 Patients. Radiology. August 2002. 224: 542-547 8. Replaced or accessory left hepatic artery Replaced left hepatic artery-Entire left hepatic artery originates elsewhere other than the PHA (4.5 %) -Commonly originates from the left gastric artery Accessory left hepatic - Part (but not all) of the left hepatic artery has an anomalous origin (15%) - Almost always originates from leftReplaced left hepatic artery arising from left gastric gastric artery, very rarely from RHAartery. Left gastric branches (arrowheads) can mimic segment 2 or 3 branches; true left hepatic branches take off beyond the umbilical point (arrow).Hiatt et al. Surgical Anatomy of the Hepatic Arteries in 1000 Cases. Annals of Surgery. July 1994. 220: 50-52.Covey et al. Variant Hepatic Arterial Anatomy Revisited: DSA Performed in 600 Patients. Radiology. August 2002. 224: 542-547 9. Middle hepatic arteryMiddle hepatic artery from RHAMiddle hepatic artery from Proper Hepatic Artery (trifurcation)A middle hepatic artery supplying segment 4 can arise from PHA as atrifurcation, or from the right hepatic artery 10. Double replaced hepatic artery Celiac injection demonstrates absence of RHA and LHA. Expected course of CHA (arrow) terminates in GDA and RGA.0.5%Replaced LHA from LGA Replaced RHA from SMACovey et al. Variant hepatic arterial anatomy revisited: DSA performed in 600 patients. Radiology 2002; 224: 542-547. 11. Replaced common hepatic artery2% Injection of celiac axis demonstrates splenic and left Common hepatic artery arises from the superior mesenteric gastric arteries, but no common hepatic artery.artery.Hiatt et al. Surgical Anatomy of the Hepatic Arteries in 1000 Cases. Annals of Surgery. July 1994. 220: 50-52. 12. Part 2:EXTRAHEPATIC COLLATERAL VESSELSORIGINATING FROM THE CELIAC AXISWHICH CAN BE PARASITIZED BY LIVERTUMORS 13. Extrahepatic collaterals in liver tumor therapyOnly tumors with surface location17% overall likelihood of extrahepatic supply at initial presentation 3% for tumors 6 cmLikelihood of extrahepatic supply increases with repeated embolizationsChung et al. Transcatheter Arterial Chemoembolization of Hepatocellular Carcinoma: Prevalence and Causative Factors of Extrahepatic CollateralArteries in 479 Patients. Korean J Radiol. 2006 Oct; 7(4): 257-266. 14. Extrahepatic collaterals to considerWhere to look based on tumor location Bare area of liver (seg 7/8): R phrenic and R adrenal Superior-anterior liver (cardiophrenic area): R internal mammary Exophytic toward kidney: R renal and R adrenal Any peritoneal surface: Omental branches from R gastroepiploic Contacts chest wall: Lower intercostal Left lateral segment: L gastric Contacts colon: Colic branches of SMA Gallbladder fossa: CysticBare area = Posterior surfaceof segment 7 and posteriorhalf of the diaphragmaticsurface of segment 8 .Chung et al. Transcatheter Arterial Chemoembolization of Hepatocellular Carcinoma: Prevalence and Causative Factors of Extrahepatic CollateralArteries in 479 Patients. Korean J Radiol. 2006 Oct; 7(4): 257-266. 15. Right inferior phrenic artery Origin Aorta 50% (12% as common trunk with LIPA) Celiac trunk 40% (16% as common trunk with LIPA) Right renal artery 5% Left gastric artery 4% Rarely other Supplies Right hemidiaphragm Suspect HCC supply for tumors in segment 7 abutting the diaphragm 50% of collateral supply Effects of embolization Usually well-tolerated Shoulder pain Pleural effusion Basal atelectasis Transient hemoptysis Diaphragmatic weakness (usually asymptomatic)Basile A et al. MDCT anatomic assessment of right inferior phrenic artery origin related to potential supply to hepatocellular carcinoma and itsembolization. CVIR 2008. 16. HCC involvement of the right inferior phrenic arteryReplaced RHA angiogram demonstrates tumor supply. DEB- Infiltrative HCC of the right lobeTACE was performed. 1 month post-TACE, tumor necrosis is seen, but persistent Right phrenic angiography demonstrates copious enhancement is seen at the posterior diaphragmatic margin.tumor supply. DEB-TACE was performed from this location. 17. Omental arteriesOrigin Right or left gastroepiploic arterySupplies Greater omentum (mobile!) Can supply tumors on almost any surface of the liverEffects of embolization Usually well-tolerated15%of collateral supplyAfter multiple TACEs, common hepatic injection demonstrates multipleomental branches (arrows) from the R gastroepiploic artery supplyingright lobe HCC (arrowheads).Kim HC et al. Recognizing extrahepatic collateral vessels that supply hepatocellular carcinoma to avoid complications of transcatheter arterialchemoembolization. Radiographics 2005.Image courtesy of Antoinette Gomes, MD. 18. Cystic ArteryOrigin Usually first branch of right hepatic arterySupplies Gallbladder HCC in gallbladder fossaRecognized by Proximal bifurcation Curved shape outlining viscusEffects of embolizationCystic artery injection demonstrates parasitic Cholecystitis/gallbladder infarction Often asymptomatic9%of collateral supply supply to HCC (arrow).Kim HC et al. Recognizing extrahepatic collateral vessels that supply hepatocellular carcinoma to avoid complications of transcatheter arterialchemoembolization. Radiographics 2005.Image courtesy of David Liu, MD. 19. Right adrenal artery Origin Superior adrenal artery from right inferior phrenic artery Middle adrenal artery from lateral aorta between the celiac and renal arteries 6% of collateral supply Inferior adrenal artery from superior aspect of right renal artery Supplies Right adrenal gland May supply tumor which extends inferomedially Effects of embolization Usually well-toleratedKim HC et al. Recognizing extrahepatic collateral vessels that supply hepatocellular carcinoma to avoid complications of transcatheter arterialchemoembolization. Radiographics 2005. 20. Uncommon sources of collateral supply Right adrenal artery (6%) Right intercostal arteries (5%) Right or left gastric artery (3%) Right internal mammary artery (3%) Superior mesenteric artery (2%) Right renal capsular artery (2%) Left inferior phrenic artery (2%)Right adrenal arteryKim HC et al. Recognizing extrahepatic collateral vessels that supply hepatocellular carcinoma to avoid complications of transcatheter arterial chemoembolization.Radiographics 2005. 21. Part 3:EXTRAHEPATIC BRANCHES ARISINGFROM THE HEPATIC ARTERIALCIRCULATION TO RECOGNIZE IN LIVEREMBOLOTHERAPY 22. Vascular optimizationProtective coil embolization of extrahepatic branches arising from the hepatic circulation prior to embolotherapy 1. Gastroduodenal artery 2. Right gastric artery 3. Accessory left gastric artery Other vessels to consider: 4. Retroduodenal artery -Dorsal pancreatic artery 5. Supraduodenal artery -Left phrenic artery -Esophageal branches 6. Falciform artery 7. Cystic arteryCoil embolization of these vessels (when necessary) prevents passage of particles (DEB or Y90) into sensitive structures 23. Accessory left gastricRight gastricFalciformLeft phrenicCysticSupraduodenalRetroduodenal Right gastric Supraduodenal Retroduodenal Dorsal pancreatic 24. Gastroduodenal ArteryOrigin Common hepatic arterySupplies Pylorus of stomach Proximal duodenum Pancreatic head (via pancreaticoduodenals) Greater curvature of stomach (via R gastroepiploic)Anatomic Clues Near constant origin fr