Mesenteric Adhesion and Poorer Perioperative Outcomes in Gastric Submucosal Tumors: A Retrospective Study of Endoscopic Full-Thickness Resection

Inside the human body, the stomach is a muscular sac that churns food, but it is not a solitary organ floating in a vacuum. It is suspended and supported by a network of fatty tissue and membranes known as the mesentery, which acts like a biological anchor, connecting the stomach to the rest of the abdominal cavity. Sometimes, tumors that grow beneath the stomach's inner lining, called submucosal tumors, can become stuck to this supporting tissue. When this happens, the tumor and the mesentery fuse together, creating a challenge for doctors who need to remove the growth. For years, the standard approach to removing these tumors has been to use a long, flexible tube with a camera and tools at the end, inserted through the mouth. While this method works well for many cases, removing larger or deeper tumors often requires cutting all the way through the stomach wall, a technique known as full-thickness resection. The critical question for surgeons has been how to predict when a tumor will be stuck to the surrounding tissue, as this adhesion can turn a routine procedure into a complex and risky operation.

A team of researchers at the Second Affiliated Hospital of Zhejiang Chinese Medical University set out to understand exactly when these adhesions occur and what happens to patients when they do. They looked back at the medical records of 202 patients who had undergone this full-thickness removal procedure for stomach tumors between 2022 and 2026. The team divided the patients into two groups: those whose tumors were free-floating and those whose tumors were stuck to the mesentery. By comparing the two groups, they aimed to identify the specific features of a tumor that signal a higher risk of sticking, and to measure how much this sticking affects the patient's recovery, the time spent in the operating room, and the cost of the hospital stay.

The study revealed that adhesions were not a rare occurrence; they were found in nearly one-third of the patients, specifically 64 out of the 202 individuals. When a tumor was stuck, the surgery took significantly longer. On average, the operations for the adhesion group lasted about 46 minutes, compared to roughly 25 minutes for those without adhesions. This extra time was not just a matter of efficiency; it had a direct impact on the patient's body. Those with stuck tumors showed a sharper rise in white blood cell counts after surgery, a sign that the body was mounting a stronger inflammatory response to the procedure. The financial toll was also higher, with the adhesion group incurring greater hospitalization costs. While the length of the hospital stay was similar for both groups, the data suggested that the presence of an adhesion makes the entire medical journey more demanding for the patient and the healthcare system.

The researchers then worked to find the "red flags" that could predict these adhesions before the surgery even began. They discovered that three specific characteristics of the tumor were strong indicators. First, the location mattered greatly; tumors growing on the back wall of the stomach were far more likely to be stuck than those on the front. Second, size played a major role; tumors larger than 30 millimeters were much more prone to adhesion than smaller ones. Third, the direction in which the tumor grew was crucial. Tumors that pushed outward, toward the abdominal cavity rather than inward toward the stomach opening, were the most likely to form these sticky connections. Interestingly, the study also found that patients with a history of high blood pressure were less likely to have these adhesions, though the reason for this protective effect remains unclear.

Perhaps most importantly, the study clarified what does not cause these adhesions. While some might assume that the specific type of tumor, such as a gastrointestinal stromal tumor, is the primary driver of sticking, the data showed that the tumor type itself was not the deciding factor. Instead, it was the physical attributes of the tumor—where it sat, how big it was, and which way it grew—that determined the risk. This distinction is vital for doctors planning a procedure. By looking at preoperative images, such as ultrasounds or CT scans, a surgeon can now identify a tumor on the back wall that is larger than 30 millimeters and growing outward. If these signs are present, the medical team can anticipate a more difficult dissection, prepare for a longer operation, and counsel the patient on the increased risks. The findings suggest that for tumors with these specific traits, the decision to proceed with this minimally invasive technique should be made with extra caution, ensuring that the potential benefits outweigh the challenges posed by the hidden adhesions.