Abstract
Tumours of the small intestine are rare and account for about 5% of gastrointestinal tract neoplasms. The angle of Treitz (AT) could be defined as the intestinal loop comprised between the third duodenal portion and the first 10 cm of jejunum. A gold standard surgical treatment for AT neoplasm has not yet been well defined. This paper is focused on a very rare disease and at the best of our knowledge this is the largest case series in the literature about the Laparoscopic Segmental Resection (LSR) of AT tumours. Using a prospectively collected database, all data of consecutive patients, from January 2007 to May 2019, who underwent LSR for AT tumours at two different institutions were analysed. Patients’ demographics, intra and post-operative data, 30-day mortality and overall survival were collected. A total of 16 patients were retrieved from our database. The mean operative time was 206,5 ± 79 min. Conversion to open surgery was needed in two cases due to tumor size and, respectively, invasion of the transverse colon which required a multivisceral resection. The mean distal and proximal resection margins were 7.4 ± 2.2 and 3.9 ± 1.2 cm. The median number of harvested nodes was 9 ± 3. Pathological diagnosis was GIST in 11 cases, adenocarcinoma in 4 and sarcoma in 1 case. In conclusion, in experienced hands, LSR appears to be a safe and effective treatment option for tumours of the AT. Prospective studies are needed to confirm these findings.
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Introduction
Tumours of the small intestine are rare and account for about 5% of gastrointestinal tract neoplasms [1]. Both gastrointestinal stromal tumour (GIST) and adenocarcinoma (ADC) of the angle of Treitz (AT) are even rarer. The AT could be defined as the intestinal loop comprised between the third duodenal portion and the proximal 10 cm of the first jejunal loop [2, 3]. The standard treatment for AT tumours has not yet been well defined. Both segmental resection (SR) and pancreaticoduodenectomy (PD) have been proposed. Few case reports and one case series suggest an open SR as the treatment of choice, associated or not with a multi-visceral resection [3,4,5,6]. However, there is a great variability in the type of resection and subsequent reconstruction among the studies. Furthermore, despite laparoscopic approach has gained wide acceptance among surgeons [7], laparoscopic segmental resection (LSR) for AT tumours has been rarely described in the literature [8, 9]. Herein, we report our case series of AT tumours treated by LSR to evaluate its safety and feasibility. Our standardised surgical technique as well as long-term results are also reported and at the best of our knowledge this is the largest case series in literature about the Laparoscopic Segmental Resection (LSR) of AT tumours.
Materials and methods
Internal ethical committee approval was obtained for data review. Using a prospectively collected database, all data of consecutive patients who underwent laparoscopic surgery for AT tumours from January 2007 to May 2019 at two different institutions (Department of General Surgery, Monaldi Hospital, Naples; Department of Gastroenterology, Endocrinology and Surgical Endoscopy, University Federico II of Naples) were retrospectively reviewed. The AT tract was defined as the intestinal loop comprised between the third duodenal portion and the proximal 10 cm of the first jejunal loop [2, 3].
Patient demographics, the American Society of Anaesthesiologists (ASA) score, previous abdominal surgery, operative time, intraoperative complications, conversion rate, pathologic outcomes (harvested lymph nodes, tumour size, length of specimen, staging according to Wittekid et al. [10]), postoperative complications according to the Clavien–Dindo classification [11], mortality, time to first flatus, length of hospital stay and readmission rate as well as long-term survival were collected.
All patients underwent a preoperative duodenoscopy with biopsy and neoplasm tattooing (if indicated) and full-body CT scan. In case of submucosal neoplasm, endoscopic ultrasound was performed.
Anastomotic leakage was considered as all conditions with clinical or radiologic features of anastomotic dehiscence in accordance with the UK Surgical Infection study Group [12, 13]. Discharge criteria included tolerance of oral intake, absence of nausea or vomiting, return of bowel function, absence of abdominal distention, no evidence of complications, adequate mobility, and patient acceptance [14].
The short-term follow-up included the first 30 postoperative days, while all adverse events that occurred later than the thirtieth day after surgery were considered as late complications. Each patient was followed-up every 6 months during the first two years and annually thereafter. Full body computed tomography was performed every 6 months for the first year and every year thereafter. After the surgical procedure, each patient was referred to an oncologist for further evaluation and treatment.
Statistical analysis
Statistical analysis was carried out using IBM SPSS Statistics 25. Continuous data are expressed as mean ± standard deviation (SD). Categorical variables are expressed as frequencies and percentage. Estimated survival was evaluated with Kaplan–Meier methods.
Surgical technique
The patient was placed in a supine reverse Trendelenburg position (30°) with right flank rotation and legs apart. Pneumoperitoneum was established with an open Veress-assisted technique and four trocars were placed in the upper abdomen. Following abdominal exploration, the gastrocolic ligament was divided to enter the lesser sac. Then, a Kocher manoeuvre was performed, and the superior mesenteric vessels were identified. The first jejunal loop was resected using an endoscopic linear stapler with a vascular cartridge at least 10 cm distal to the Treitz ligament. Then, the third and fourth duodenal portions were mobilized dissecting from the superior mesenteric vessels. In case of malignancy, lymph node dissection along the superior mesenteric artery was performed together with ligation of the inferior pancreaticoduodenal artery and first jejunal artery. The duodenum was divided between the second and the third portion, at least 2 or 5 cm above the neoplasm [3] for GIST and adenocarcinoma, respectively; an endoscopic linear stapler with a vascular cartridge was used. An intracorporeal mechanical side-to-side isoperistaltic duodenojejunostomy was performed between the second duodenal portion and the jejunum [9]. Stapler access enterotomy was closed with a double-layer absorbable running suture [15, 16]. A methylene blue dye leak test was performed to assess anastomotic integrity. The specimen was retrieved through a Pfannenstiel incision. Fascial defects ≥ 10 mm were closed [17]. The laparoscopic segmental resection technique is demonstrated in the video (Online Resource 1).
Results
A total of 16 patients were retrieved from our database. Biometric features are reported in Table 1.
Anaemia was the most frequent preoperative symptom. Intraoperative and postoperative data are reported in Table 2. Mean operative time was 206.5 ± 79 min. Intraoperative duodenoscopy was performed in two patients to assess the proximal resection margin and distance from the papilla of Vater. Conversion was needed in two cases due to large tumour size (15 cm) and infiltration of the transverse colon, respectively; an open multi-visceral resection was needed in the latter case. Two intraoperative complications occurred including a haemorrhage from the splenic vein, which needed a distal spleno-pancreatectomy, and an ileal loop injury that was sutured. All intraoperative complications were treated without conversion.
In two cases multi-visceral resection due to advanced disease was performed laparoscopically, which included distal spleno-pancreatectomy in the former and transverse colon resection in the latter.
The mean length of hospital stay was 9.1 ± 2.77 days. Two postoperative complications were found including one atrial fibrillation (Clavien–Dindo II) and one pulmonary embolism requiring intensive care unit management (Clavien–Dindo IV).
The mean distal and proximal resection margins were 7.4 ± 2.2 and 3.9 ± 1.2 cm. The median number of harvested nodes was 9 ± 3. Pathological examination showed a GIST in eleven cases, adenocarcinoma in four cases and one sarcoma (Table 3). After a mean follow-up of 51 ± 38 months, we found an estimated survival rate of 46.2%. Six deaths occurred: two patients died for disease recurrence, while four patients died for non-tumour-related causes (Table 3). The two recurrences were observed in the patient affected by sarcoma and in a patient affected by a GIST with a Ki67 index of 45% and a mitotic count of 6/50 HPF. Both patients developed local recurrence with infiltration of the pancreas and transverse colon.
Discussion
AT tumours pose a unique challenge for both identification of the tumour location and for surgical planning as well as treatment [18]. Preoperative diagnosis by conventional endoscopy may be difficult as the duodenojejunal region is not easily reached. Although not used in the present series, new modalities such as double-balloon enteroscopy or capsule endoscopy can make diagnosis of AT tumours easier [3]. Contrast-enhanced abdominal CT gives useful information regarding the location and the anatomical relationships between the mass and the surrounding structures, including vascular infiltration and invasion of adjacent organs. Biopsy is accepted as gold standard for diagnosing gastrointestinal tumours and it could be useful to properly plan a surgical approach with radical intent. However, obtaining a histological diagnosis of AT tumours preoperatively may be challenging due to (1) the difficulty in reaching these tumours, (2) major vessels in the surrounding that hamper approach under imaging guidance and (3) the possible submucosal location as in the cases of GISTs [3].
Due to their rarity and the variety of histotypes, the surgical treatment of AT tumours is not yet well defined. As reported in Table 4, only seven case reports and one case series of 13 patients (with a laparotomic approach) have been published on this topic since 1951 [3,4,5,6, 19,20,21,22]. Other cases were reported in the context of larger series concerning the treatment of different duodenal tracts [23, 24].
Surgical resection with negative margins and no intraoperative tumour spillage is accepted as treatment of choice for GISTs without the need of regional lymphadenectomy. Thus, SR is an option for tumours not amenable to wedge resection [25, 26].
PD with regional lymph node dissection has been initially suggested as a standard treatment for AT adenocarcinoma [27, 28]. Given the high morbidity rate of PD, a SR including the third and fourth duodenal portions and at least 10 cm of the first jejunal loop has been proposed [4, 5, 27, 29,30,31,32]. Indeed, similar mortality and morbidity rates between PD and SR have been reported by some authors [31,32,33]. Kaklamanos et al. [31] reported a morbidity rate of 27% for PD compared to 18% for SRD, with a mortality rate of 3% and, respectively, 1%. However, it must be acknowledged that a higher mortality rate is expected for PD when the procedure is not carried out in centres of excellence. Han et al. reported an increase from 3% up to 13.8–16.5% in those centres performing less than 5 PD per year [29]. Moreover, pancreatic leakage is absent or extremely rare following SRD. Surgical resection with negative margins and no intraoperative tumour spillage is accepted as treatment of choice for GISTs without the need of regional lymphadenectomy. Thus, SR is an option for tumours not amenable to wedge resection [25, 26]. While the type of operation would not affect long-term survival, this may be influenced by other factors including R1 or palliative resection, a locally advanced tumour, positive regional lymph nodes, and poor response to adjuvant chemotherapy [34]. Also, cancer location seems to affect survival, since tumours of the proximal duodenum show a worse prognosis than those arising in the third or fourth duodenal portions. This may be due to the closer relationship with the surrounding organs, which may be affected early in the course of the disease, as well as to the different routes of lymphatic drainage. Based on these considerations, PD may be recommended for tumours located in the proximal duodenum, while SR seems to be appropriate for distal tumours [30].
Regardless of the extent of resection, the importance of an adequate lymphadenectomy cannot be underscored [35]. Although the number of harvested lymph nodes for accurate N staging is debated —ranging from 6 to 15—[36,37,38], this number alone may not be a surrogate for adequate lymphadenectomy [39]. Tumours of the distal duodenum commonly involve the pancreaticoduodenal (#13) and superior mesenteric (#14) lymph node stations, while metastases to the pyloric (#5/6) and hepatic (#8 and #12) stations are usually not observed. Thus, the former lymph node stations should be included when SR for AT adenocarcinoma is performed [39].
Despite the limited number of patients and the histological heterogeneity of the disease treated, we found an estimated survival rate of 46.2% after a median follow-up of 51 ± 38 months. Due to the rarity of this tumour location, it would be very difficult to make considerations about the survival considering only the biology of histotype.
Surgery for AT tumours is technically challenging because of the variability and anatomical complexity of the duodenojejunal junction, which make it difficult to expose the operation field and visualize the intestine circumferentially [9]. Therefore, laparoscopy does not yet represent a standard approach for resection of AT tumours [8]. This approach has at least two major challenges to surgeons. The first is achieving an adequate proximal resection margin. It has been suggested that R0 resection for GISTs and adenocarcinomas can be attained with a safe margin of 2–5 cm, respectively [3, 6]. In our series, the mean proximal resection margin (3.9 ± 1.2 cm) was adequate, thus providing an R0 resection in all cases (Table 3). Reconstruction is also a challenging step. Indeed, the short stump of bowel after resection of the tumour at the duodenojejunal junction makes it difficult to handle during the anastomosis [9]. Different reconstruction methods through the open approach have been reported such as hand-sewn end-to-end duodenojejunostomy [40] and mechanical end-to-side duodenojejunostomy [10]. Instead, the use of a linear stapler allows a minimally invasive reconstruction in a side-to-side fashion between the duodenal stump and the jejunum.
To overcome the hurdles of intestinal exposure and reconstruction at the duodenojejunal flexure, the intestinal derotation technique described by Valdoni has been proposed as a valid option for SR of the third and fourth duodenal portions [41]. After derotation, the duodenojejunal flexure becomes straight, thus allowing a simplified resection and reconstruction, similar to those of a jejunal loop. This complex procedure can be carried out with a minimally invasive approach by surgeons with extensive experience in both laparoscopic surgery and open intestinal derotation [42].
Laparoscopic SR remains a technically demanding procedure also for experienced surgeons. Indeed, two intraoperative complications including splenic vein injury and bowel injury occurred in our series. Moreover, conversion should be part of the surgical strategy to provide a complete resection or reconstruction based on intraoperative evaluation [43]. Despite the technical difficulties of laparoscopic approach, magnification of the image may allow a more accurate dissection and thus it could help in preventing injuries of the pancreas and mesenteric axis. Moreover, a totally laparoscopic procedure may be beneficial in terms of quick recovery and short hospital stay as well as reduced surgical site infections [8].
This paper has some limitations. First, the historical bias due to the long-time span in which the patients has been treated. Then, the retrospective nature of the study, the heterogeneity of the disease treated and the small sample size analysed. However, our paper is focused on a very rare disease and, at the best of our knowledge, this is the largest case series in the literature about LSR for tumours of the duodenojejunal flexure. A single retrospective study including eight patients undergoing LSR for a GIST has been published [9]. As in our series, all patients underwent curative resection with a similar postoperative morbidity (12.5%) and no mortality. Neither conversions to open surgery nor recurrences at 37-month follow-up were observed.
In conclusion, in experienced hands, laparoscopic segmental resection appears to be a safe and effective treatment option for tumours of the angle of Treitz. Larger prospective studies are needed to confirm these findings.
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We thank Juliet Ippolito, BA, Vassar College, MPhil, University of Dundee, for English language editing.
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FC: coordinated the study. UB, RP, AS, FP, FC contributed to the study conception and design. UB, FP, DC, MD, FC: performed the surgical procedures. FP, EP, VS, AC: collected data. RP, AR, AS: performed data analysis and interpretation. UB, RP, AS: drafted the manuscript. UB, RP, MD, RL, AS, FC: critically revised the manuscript for important intellectual content. RP and AS equally contributed to the manuscript. All authors commented on the previous version of the manuscript, read and approved the final version to be published and agree to be accountable for all aspects of the work.
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Bracale, U., Pontecorvi, E., Silvestri, V. et al. Laparoscopic segmental resection for tumours of the Angle of Treitz: a challenging but feasible surgical option. Results from a retrospective case-series analysis. Updates Surg 73, 179–186 (2021). https://doi.org/10.1007/s13304-020-00910-7
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DOI: https://doi.org/10.1007/s13304-020-00910-7