Short Appendiceal Stump on CT Predicts Complex Resection and Open Conversion

Refining Surgical Strategy in Complicated Appendicitis

The management of acute complicated appendicitis remains a point of clinical contention, particularly regarding the choice between immediate operative intervention and initial nonoperative management with antibiotics or percutaneous drainage [1, 2, 3]. While laparoscopic appendectomy is the established standard for uncomplicated cases, the presence of a phlegmon (an inflammatory mass involving the appendix and adjacent viscera) or abscess significantly increases the technical difficulty of the procedure [4, 2]. Surgeons must frequently navigate decisions regarding the optimal method for appendiceal stump closure, weighing the use of endoloops, clips, or staplers to prevent postoperative leaks and abscesses [5, 6, 7]. Despite advancements in energy devices (surgical instruments that use ultrasonic or electrical current to seal and transect tissue), the risk of conversion to open surgery or the need for extended bowel resection remains a concern in severe inflammatory presentations [8, 9]. A multicenter retrospective review of 152 patients now indicates that an appendiceal stump length of less than 2 cm on preoperative computed tomography (CT) is associated with a significantly increased risk of extended resection (OR 20.2, 95% CI: 4.43 to 92.15, p < 0.001) and a higher likelihood of conversion to open surgery (OR 5.9, 95% CI: 1.97 to 17.63, p < 0.001) [10, 11]. These findings suggest that preoperative imaging markers can help clinicians anticipate intraoperative challenges and tailor their surgical approach to reduce the mean length of hospital stay, which was significantly longer in patients with shorter stumps (4.6 days versus 3.0 days, p = 0.01) [10].

Quantifying the Risk of Extended Resection

The multicenter retrospective review analyzed 152 patients with acute complicated appendicitis who were managed operatively between January 2018 and May 2024. To determine the predictive value of preoperative imaging, the researchers established the primary outcome as the need for extended resection, which involves the surgical removal of additional bowel segments, such as the cecum or terminal ileum, beyond the appendix itself. Secondary outcomes tracked by the study included conversion from laparoscopic to open surgery, hospital readmission rates, length of stay, the development of postoperative abscesses, and overall mortality. By comparing patients based on the measurement of the appendiceal stump on computed tomography, the study sought to provide clinicians with a concrete metric for anticipating surgical complexity before entering the operating room. The analysis revealed that an appendiceal stump length of less than 2 cm was associated with a twenty-fold increase in the risk of needing an extended resection (OR 20.2, 95% CI: 4.43 to 92.15, p < 0.001). This finding was observed in a cohort where 54 patients had a stump length under 2 cm, while 98 patients had a stump length of 2 cm or greater. Beyond the primary outcome, the data showed that patients with a stump size under 2 cm also faced significantly increased odds of conversion to open surgery (OR 5.9, 95% CI: 1.97 to 17.63, p < 0.001). These metrics suggest that a shorter visible stump on imaging may indicate more extensive inflammation or necrosis at the base of the appendix, necessitating more invasive surgical maneuvers to ensure a secure closure.

Patient Characteristics and Imaging Metrics

The study methodology centered on the precise measurement of the appendiceal stump, which refers to the remaining portion of the appendix visible on imaging, to determine its predictive value for surgical outcomes. These measurements were performed on preoperative computed tomography (CT) scans by an attending acute care surgeon to ensure clinical consistency. The researchers evaluated whether an appendiceal stump size of 2 cm or greater on preoperative CT scan could accurately predict intraoperative complexity and postoperative outcomes in patients presenting with acute complicated appendicitis. By establishing this specific anatomical threshold, the study aimed to provide a standardized metric for surgeons to assess the likelihood of difficult dissections or the need for more extensive bowel resection before the first incision is made. The study cohort consisted of 152 patients who were categorized into two primary groups based on their imaging findings. Among these participants, 98 patients had a stump size of 2 cm or greater, while 54 patients had a stump length of less than 2 cm. When analyzing the baseline demographics and medical histories of these two groups, the researchers found that patients with a stump size of 2 cm or greater were significantly more likely to have chronic kidney disease (the long-term loss of kidney function), with a prevalence of 9.9 percent compared to 0.0 percent in the group with shorter stumps (p = 0.002). Aside from this specific comorbidity, the authors noted that there were no other differences in baseline characteristics between the two groups, suggesting that the cohorts were otherwise well matched for comparison. For the practicing clinician, these findings indicate that the measurement of the appendiceal stump on preoperative imaging may serve as a useful adjunct (a supplementary tool used to assist in clinical decision-making) in operative planning for patients with acute complicated appendicitis. Because the shorter stump length correlates so strongly with increased surgical difficulty and longer hospital stays, identifying this metric on a CT scan allows the surgical team to anticipate the need for additional resources or a potential conversion to an open procedure.

Postoperative Recovery and Safety Profiles

The anatomical challenges associated with a shorter appendiceal stump translate directly into a more protracted recovery period for the patient. The researchers found that the length of stay (the total duration of the hospital admission) was significantly longer in patients with appendiceal stumps measuring less than 2 cm, who required a mean of 4.6 plus or minus 3.7 days of inpatient care. In contrast, patients with a stump length of 2 cm or greater experienced a shorter length of stay, averaging 3.0 plus or minus 2.3 days (p = 0.01). This 1.6 day difference in hospital duration suggests that the increased intraoperative complexity associated with shorter stumps necessitates more intensive postoperative monitoring or a slower return to baseline function. Despite the increased risk of extended resection and longer hospitalizations, the study indicates that the anatomical length of the stump does not adversely affect the overall safety profile of the procedure. The researchers reported that there was no difference in readmissions, postoperative abscess formation, or mortality (death) between the two groups. These findings suggest that while a stump length under 2 cm predicts a more technically demanding operation and a longer initial recovery, it does not necessarily portend a higher rate of infectious complications or death if the surgical team manages the case appropriately. For the clinician, this provides reassurance that the primary impact of a short appendiceal stump is on the complexity of the index hospitalization rather than on long term survival or the likelihood of subsequent surgical site infections. Integrating this measurement into the preoperative workup provides a concrete data point that assists in risk stratification and patient counseling prior to emergency surgery.

References

1. Saverio SD, Podda M, Simone BD, et al. Diagnosis and treatment of acute appendicitis: 2020 update of the WSES Jerusalem guidelines. World Journal of Emergency Surgery. 2020. doi:10.1186/s13017-020-00306-3

2. Dahiya DS, Akram H, Goyal A, et al. Controversies and Future Directions in Management of Acute Appendicitis: An Updated Comprehensive Review. Journal of Clinical Medicine. 2024. doi:10.3390/jcm13113034

3. Zhou S, Cheng Y, Cheng N, Gong J, Tu B. Early versus delayed appendicectomy for appendiceal phlegmon or abscess. Cochrane Database of Systematic Reviews. 2024. doi:10.1002/14651858.cd011670.pub3

4. Saverio SD, Birindelli A, Kelly MD, et al. WSES Jerusalem guidelines for diagnosis and treatment of acute appendicitis. World Journal of Emergency Surgery. 2016. doi:10.1186/s13017-016-0090-5

5. Ihnát P, Tesař M, Tulinský Ľ, Rudinská LI, Okantey O, Durdík Š. A randomized clinical trial of technical modifications of appendix stump closure during laparoscopic appendectomy for uncomplicated acute appendicitis. BMC Surgery. 2021. doi:10.1186/s12893-021-01279-z

6. Lv B, Zhang X, Li J, et al. Absorbable polymeric surgical clips for appendicular stump closure: A randomized control trial of laparoscopic appendectomy with lapro-clips. Oncotarget. 2016. doi:10.18632/oncotarget.9283

7. Zorzetti N, Lauro A, Bellini MI, et al. Laparoscopic appendectomy, stump closure and endoloops: A meta-analysis. World Journal of Gastrointestinal Surgery. 2022. doi:10.4240/wjgs.v14.i9.1060

8. Singh A, Anand S, Pakkasjärvi N, Verma A, Bajpai M. Energy Devices for Clipless–Sutureless Laparoscopic Appendectomy: A Systematic Review and Meta-Analysis on Utility and Safety. Medicina. 2022. doi:10.3390/medicina58111535

9. Turial S, Schwind M, Nyiredi A. Evaluation of the Appropriate LigaSure™ Device to Transect the Appendix—A Comparison between 5 mm and 10 mm Laparoscopic Devices in an Ex Vivo Trial. Medicina. 2023. doi:10.3390/medicina59050927

10. Gerard J, Knapp C, Nemykina Y, et al. Appendiceal stump length as a predictor of operative outcomes in complicated appendicitis.. The journal of trauma and acute care surgery. 2026. doi:10.1097/TA.0000000000005002

11. Gerard J, Knapp C, Nemykina Y, et al. Appendiceal stump length as a predictor of operative outcomes in complicated appendicitis. The Journal of Trauma: Injury, Infection, and Critical Care. 2026. doi:10.1097/ta.0000000000005002