The hepatic flexure is the sharp bend in the large intestine where the ascending colon ends and the transverse colon begins, located just beneath the right lobe of the liver. Its name comes from the Latin word for liver (“hepar”), because the bend tucks directly under the liver’s surface. This bend sits high in the right side of the abdomen, roughly at the level of the lowest ribs, and acts as both a structural turning point and a zone where several clinical problems can arise. Understanding where this bend lives and what it does helps make sense of everything from colonoscopy reports to surgical decisions about right-sided colon cancer.
Where Exactly It Sits and What It Touches
The colon forms a rough frame around the abdominal cavity. On the right side, the ascending colon climbs upward from the cecum toward the underside of the liver, then makes a roughly 90-degree turn to the left. That turn is the hepatic flexure. After the bend, the colon continues across the upper abdomen as the transverse colon. Because the liver is the largest solid organ in the abdomen and occupies much of the right upper quadrant, the hepatic flexure is pressed against its underside. In many people there is a visible impression on the liver’s surface where the colon rests.
Several other organs neighbor the hepatic flexure. The gallbladder hangs from the liver just medially, and the right kidney and the second part of the duodenum sit behind it. These tight relationships matter clinically: diseases in one organ can spread to, compress, or erode into another. A case report, for instance, documented aggressive gallbladder cancer invading directly through the wall of the hepatic flexure, creating an abnormal passage between the gallbladder and the colon called a cholecystocolic fistula.1PubMed Central. Transmural invasion of hepatic flexure of colon causing cholecystocolic fistula by aggressive gallbladder carcinoma That kind of complication is rare, but it illustrates how proximity to the liver and gallbladder makes this stretch of colon a crossroads for abdominal pathology.
Blood Supply to the Hepatic Flexure
The blood supply to the right colon, including the hepatic flexure, comes from branches of the superior mesenteric artery. Three arteries share the job. The ileocolic artery is the most consistent, present in virtually all people. The right colic artery is the most variable, appearing in only about two-thirds of cases. And the middle colic artery, which feeds the transverse colon, is present roughly 95% of the time but varies in its exact origin and branching pattern.2PubMed. Arterial vascularization of the right colon with implications for surgery The hepatic flexure sits at the junction of the territories supplied by the right colic and middle colic arteries, so its blood supply can come from either or both.
Running along the inner border of the colon is the marginal artery, a continuous arcade that connects all of these feeding vessels. This marginal artery is present in nearly everyone and serves as the only peripheral arterial arc on the right side of the colon.2PubMed. Arterial vascularization of the right colon with implications for surgery For surgeons, all of this variability means that no two patients have exactly the same plumbing in this region. Preoperative imaging and careful dissection are standard when removing a hepatic flexure tumor, because clipping the wrong vessel or failing to account for a missing right colic artery can compromise blood flow to the remaining colon.
What the Hepatic Flexure Does During Digestion
By the time digested material reaches the hepatic flexure, most nutrients have already been absorbed in the small intestine. The colon’s main jobs are to absorb water and electrolytes from the remaining slurry and to store what is left until it can be expelled. The hepatic flexure is part of the proximal colon, where water absorption is most active. Stool in this region is still fairly liquid; it only becomes more solid as it moves through the transverse and descending colon.
Gastroenterologists can measure how fast material moves through the colon using transit studies. One common method divides the colon into seven segments, with the hepatic flexure as the second segment after the cecum and ascending colon. A low score on the transit measurement means the center of activity is still sitting in the proximal colon, while a higher score means material has moved to the left side or been expelled.3Journal of Nuclear Medicine Technology. Gastrointestinal Motility, Part 2: Small-Bowel and Colon Transit If transit slows at or near the hepatic flexure, the proximal colon absorbs extra water from the stool, which can contribute to constipation. Conversely, rapid transit through this region can mean the colon never gets the chance to dry things out adequately, leading to loose stools.
Cancer at the Hepatic Flexure
Colorectal cancer is often discussed in terms of “right-sided” versus “left-sided” tumors, and the hepatic flexure falls on the right. Right-sided colon cancers tend to behave somewhat differently from left-sided ones. They are more likely to be diagnosed at a later stage because they can grow quite large before causing noticeable symptoms like obstruction or visible bleeding. The hepatic flexure is a recognized site for these tumors, and a rare subtype called adenosquamous carcinoma of the colon is reported to favor the right side, including the hepatic flexure specifically.4PubMed Central. Adenosquamous carcinoma of the hepatic flexure of colon: a case report
One ongoing clinical question has been whether tumors located at the hepatic flexure carry a worse prognosis than tumors elsewhere in the right colon. A study comparing outcomes in patients with hepatic flexure tumors versus those with tumors in the cecum and ascending colon found that five-year overall survival was actually slightly higher for the hepatic flexure group, and the hepatic flexure location was not identified as an independent poor prognostic factor.5PubMed. Right-Sided Colon Cancer: Is Hepatic Flexure Location a Factor of Poor Oncologic Prognosis? Other factors, such as a patient’s existing health conditions and whether surgery was performed on an emergency basis, had a much bigger impact on survival than the exact location within the right colon.
Surgery for Hepatic Flexure Tumors
Removing a hepatic flexure cancer is surgically trickier than removing a tumor in a straighter segment of the colon. The hepatic flexure sits at the boundary between the ascending and transverse colon, so the surgeon sometimes needs to perform an extended right hemicolectomy, taking out more of the colon than a standard right-sided resection. The variable blood supply discussed earlier is part of what makes this area challenging: the surgeon must identify which arteries feed the tumor-bearing segment and ensure the remaining colon still has enough blood flow after those vessels are cut.
Lymph node dissection around the hepatic flexure adds another layer of complexity. Several ligaments attach the colon to nearby structures in this region, including the gastrocolic ligament that connects the transverse colon to the greater curvature of the stomach. Studies have examined whether surgeons should routinely dissect lymph nodes in these ligaments. The rate of finding cancer cells in the nodes of the gastrocolic ligament near the hepatic flexure is quite low, but selective dissection in higher-risk patients may still improve outcomes.6PubMed Central. Fascial anatomy of ligamentous structures associated with colon cancer surgery A systematic review of infrapyloric and gastroepiploic node dissection for hepatic flexure and transverse colon cancers found that the rate of metastasis to those node groups ranged widely, from under 1% to as high as 22%, depending on the study and the patient population.7PubMed Central. Infrapyloric and gastroepiploic node dissection for hepatic flexure and transverse colon cancer: A systematic review The complication rates from these extended dissections were not trivial either, ranging from roughly 9% to 37%, though most complications were mild. This is the kind of trade-off surgeons weigh on a case-by-case basis.
Chilaiditi Sign and Syndrome
One of the more unusual conditions involving the hepatic flexure is Chilaiditi sign, where a loop of colon slips between the liver and the diaphragm. On an abdominal X-ray, this creates a pocket of air that looks like it is trapped under the right side of the diaphragm, which can be alarming because free air under the diaphragm usually signals a perforated organ. Chilaiditi sign is specifically defined as the interposition of the hepatic flexure between the liver surface and the dome of the diaphragm.8Gastroenterology Review. Chilaiditi sign in a plain abdominal X-ray – why is it worth remembering? It is found incidentally on imaging in a small percentage of people and usually causes no problems at all.
When the condition does cause symptoms, such as abdominal pain, bloating, nausea, or difficulty with bowel movements, it is upgraded from “Chilaiditi sign” to “Chilaiditi syndrome.” One reported case involved a patient whose hepatic flexure had developed a cystic dilation measuring over 8 centimeters at its widest point, along with liver atrophy on the right side that left extra room for the colon to migrate upward.9PubMed Central. Intermittent abdominal pain accompanied by defecation difficulties caused by Chilaiditi syndrome: A case report Most cases are managed conservatively with dietary changes and laxatives. Surgery is reserved for people who develop obstruction, volvulus (twisting of the colon), or other complications that do not respond to simpler measures.
How the Hepatic Flexure Differs from the Splenic Flexure
The colon has two major bends. The hepatic flexure on the right side turns the ascending colon into the transverse colon; the splenic flexure on the left side turns the transverse colon into the descending colon. Though they are mirror-image bends, they are not identical in either anatomy or clinical behavior.
The splenic flexure sits higher in the abdomen than the hepatic flexure, tucked near the spleen and the tail of the pancreas, and it is anchored by three separate ligaments: the gastrocolic, phrenocolic, and splenocolic ligaments.10PubMed Central. Recurrent splenic flexure colonic volvulus: A case report These attachments make the splenic flexure notably more fixed in position than the hepatic flexure, which has fewer ligamentous tethers. Paradoxically, the splenic flexure’s tighter fixation also means that when those attachments are congenitally absent or damaged by previous surgery, the freed colon is at risk of twisting on itself, a condition called volvulus. Splenic flexure volvulus is very rare precisely because those ligaments usually hold things in place. The hepatic flexure, being less rigidly tethered, can shift position more easily, which is part of why it is the bend that migrates upward in Chilaiditi sign.
The blood supply at the two flexures also differs. The splenic flexure lies at the watershed between the superior mesenteric artery (which feeds the right and transverse colon) and the inferior mesenteric artery (which feeds the left colon). That makes the splenic flexure more vulnerable to ischemia when blood pressure drops, because it depends on the overlap between two arterial territories. The hepatic flexure, by contrast, is supplied entirely by branches of the superior mesenteric artery and its marginal artery arcade, so it does not sit at the same kind of vascular boundary.
Navigating the Hepatic Flexure During Colonoscopy
If you have ever had a colonoscopy, the endoscopist navigated past the hepatic flexure on the way to inspecting the ascending colon and cecum. The hepatic flexure is one of the tighter turns the colonoscope must negotiate, and it can be a source of discomfort during the procedure. As the scope rounds the bend, the angle can cause the instrument to push against the abdominal wall or stretch the surrounding mesentery, which some patients feel as a cramping sensation even under sedation.
From the endoscopist’s perspective, the hepatic flexure is a landmark. Seeing the characteristic bluish hue of the liver through the colon wall confirms that the scope has reached the right upper quadrant. The area just around the bend is also a known spot where polyps or early cancers can hide behind folds, so careful inspection during withdrawal of the scope is important. Guidelines generally recommend a slow, deliberate withdrawal with adequate insufflation to flatten the folds and get a good look at the mucosal surface, especially at both flexures where the angles can create blind spots.
When Symptoms Point to the Hepatic Flexure
Pain or discomfort originating at the hepatic flexure tends to show up in the right upper quadrant of the abdomen, which is exactly the same area where gallbladder and liver problems cause pain. This overlap is a common source of diagnostic confusion. A patient presenting with right upper quadrant pain, nausea, and bloating might initially be worked up for gallstones, only for imaging to reveal a colon mass at the hepatic flexure or an impaction of stool in that region. Gas trapped at the hepatic flexure can also mimic gallbladder symptoms; some gastroenterologists informally refer to this as “hepatic flexure syndrome,” though it is not a formal diagnosis.
Because right-sided colon tumors can grow silently, anemia from slow, invisible blood loss is sometimes the first clue. A person might feel fatigued and be found to have low iron levels on routine blood work, prompting further investigation that eventually reveals a mass at the hepatic flexure. This pattern is more common with right-sided lesions than left-sided ones, where obstruction and visible rectal bleeding tend to appear earlier. The practical takeaway is that unexplained iron-deficiency anemia in an adult, especially someone over 50, usually warrants a colonoscopy to rule out a right-sided source.
Hepatic Flexure Syndrome and Functional Complaints
Beyond structural diseases like cancer and Chilaiditi, the hepatic flexure can be the site of functional complaints. “Hepatic flexure syndrome” is an older, somewhat informal term for pain and bloating caused by gas distention at the bend. The theory is straightforward: the sharp angle at the hepatic flexure can temporarily trap gas as it moves through the colon, stretching the colon wall and producing a crampy, pressure-like pain in the right upper quadrant. Changing position, passing gas, or having a bowel movement typically relieves it.
This is not considered a disease so much as a nuisance, and it overlaps heavily with symptoms of irritable bowel syndrome. If you experience it repeatedly, the standard advice is to reduce gas-producing foods, eat slowly to swallow less air, and stay physically active. The hepatic flexure is not unique in trapping gas; the splenic flexure is actually more commonly associated with this pattern, probably because it sits at a sharper angle higher in the abdomen. But the hepatic flexure version is worth knowing about because it mimics gallbladder and liver pain and can lead to unnecessary worry or testing if the possibility is not on the radar.