Gambardella D, Schicchi A A, Boccuto A,

Bilotta V, Caruso E, Borrello L, Tedesco M.

“Dovetail” gastric resection: a novel model

in the treatment of gastrointestinal stromal

tumors. J Gastric Surg 2020; 2(4).

Gastrointestinal stromal tumors (GISTs) are the most frequent malignant subepithelial lesions of the digestive tract. Their origin is from the interstitial cells of Cajal located within the muscle layer and their main characteristic is an overexpression of the receptor tyrosine kinase KIT. The prognosis is associated with tumor size and mitotic index while standard treatment is surgical resection for non-advanced stages of disease. The surgeon’s objective is to achieve the R0 resection with the largest possible free margin.[1] Laparoscopic surgery is a valid surgical treatment option compared to open surgery for gastric GIST.[2] It is possible to choose between an open surgery or a laparoscopic resection for gastric GIST in selected patients, especially for tumors less than 5 cm, or located on the anterior wall, greater curvature, less curvature. In these cases, laparoscopic surgery demonstrated better short-term outcomes than open resection.

[3] Large lesions located at the level of the anthro-pyloric region often need major resections. In this technical note, we propose a new gastric resection for giant GISTs of the gastric antrum as an alternative to Billroth I (B-I) and Billroth II (B-II)and Roux-en-Y (R-Y) reconstructions burdened by perioperative and postoperative effects.

A 60-year-old male patient with a history of hypertension was admitted with the chief complaint of upper abdominal pain for 3 month; The pain abdominal distension, and discomfort that was accompanied by a sour regurgitation and weight loss. He had no family history of malignant tumors. Routine blood, routine urine, blood biochemical tests were normal, and the tumor marker test results were all within normal ranges. Gastroscopy revealed a giant smooth bulge covered with normal mucosa with a maximum diameter of 7 cm in the gastric antrum that indicated a probable stromal tumor (Figure 1).

A small incision was made between the xiphoid and umbilicus. First, an exploratory laparotomy was performed.

The greater omentum of the stomach was dissected from the middle portion of the transverse colon, exposing the posterior wall of the stomach and opening the lesser sac. The gastroepiloic artery and vein at the greater curve are ligated and transected, preserving the arcade vessels of the proximal part of the stomach. The access to the epiploon retrocavity allowed to control the integrity of the gastric wall. The omentum minus was opened along the lesser gastric curvature. The right gastric artery was exposed and its branches tied. Gastrotomy was performed on the antral side. The eversion of the anterior gastric wall revealed a giant smooth bulge covered with normal mucosa with a maximum diameter of 7 cm in the gastric antrum that indicated a possible stromal tumor. “Dovetail” gastric wall resection including the tumor was performed while maintaining a safety margin of at least 2 cm. This semi-circular resection of the anterior and posterior gastric wall, posteriorly partial, allowed the removal of the lesion. Lymphnodes stations #5 and #6 were also included. A termino-terminal anastomosis was performed between the wall of the gastric body and the proximal portion of the pylorus with manual suturing. A nasogastric tube was placed and then removed on the fourth post-operative day.

The most effective treatment for gatric GIST is radical resection. This is still the only treatment option that provides the highest chance of medium to long-term overall and disease-free survival. Gastrointestinal reconstruction procedure options after distal or subtotal gastrectomy for patients with gastric disease are still controversial.[4]

The three possible reconstructions for patients with gastric cancer or benign gastric disease are reconstructions B-I and B-II, R-Y. However, patients undergoing B-I and B-II reconstruction often show reflux symptoms as a complication. On the contrary, the R-Y reconstruction is superior to the traditional B-I and B-II reconstructions in the prevention of reflux symptoms and in preventing gastritis that seems to increase the risk of gastric carcinogenesis. However, the R-Y is a more complex reconstruction and some patients show the delayed gastric emptying syndrome, known as Roux stasis syndrome. To avoid complications, some technical shrewdnesses are necessary as an adequate length of the alimentary limb.[5]

We proposed a novel atypical gastric resection technique for gastric antral GIST as an alternative to B-I, B-II and R-Y reconstructions that, as previously reported, are burdened by negative postoperative effects. The ideal reconstruction method should fit the patient’s physical condition, reduce the risk of postoperative complications, and improve the patient’s quality of life. The reconstruction method is often a matter of the surgeon’s preference. We choose the reconstruction method on the basis of the tumor location. For this Gastric antrum GIST we prefer to do a semi-cicular “Dovetail” resection including the tumor, maintaining a safety margin of 2 cm. This resection strategy led to good functional results, such as increased food intake, post-operative body weight retention and no complaints of postprandial symptoms. The “Dovetail” method has the physiological advantage of allowing the food to pass through the duodenum, with a better effect on digestion and absorption of nutrients. The natural transition improves long-term nutritional status and quality of life. We suggest to perform this type of atypical resection for GISTs or benign gastric tumors involving the antrum that seems to be effective and safe with optimal clinical and oncological outcomes.