More Severe Presentations of Acute Appendicitis During COVID-19


Coronavirus disease (COVID-19) has caused unprecedented changes to almost every aspect of society. On March 11, 2020, the World Health Organization declared COVID-19 a pandemic. In order to contain the spread, Argentinian government rapidly declared a mandatory stay-at-home order on March 20th.1 We aimed to evaluate differences in imaging findings and postoperative outcomes of acute appendicitis (AA) patients between the COVID-19 pandemic period and a non-pandemic period.


We prospectively collected data of all patients who underwent laparoscopic appendectomy (LA) for AA between April 1, 2020, and August 31, 2020, during COVID-19 quarantine (G1) and compared them to a control group of patients who underwent LA during the same period in 2018 and 2019 (G2). Abdominal ultrasound (US) and computed tomography (CT) findings were reviewed and classified according to a modified score based on a reported classification: 1 normal, 2 non-diagnostic study, 3 uncomplicated AA, and 4 complicated AA.2 Complicated appendicitis was defined intraoperatively as a gangrenous or perforated appendix and severe peritonitis as the presence of fecal peritonitis in any quadrant or purulent fluid in more than one quadrant. The Kruskal-Wallis test was used to compare continuous variables, whereas the χ2 test was used for categorical variables. A p value < 0.05 was considered statistically significant.


A total of 202 LA were included for the analysis: 60 during COVID-19 quarantine (G1) and 142 in the control group (G2). Clinical diagnosis of AA was supported by US in all cases, and the number of CT scans performed for AA diagnosis (G1: 30% vs. G2: 35%, p = 0.43) remained similar in both groups. US grade 4 AA (G1: 13% vs. G2: 4%, p = 0.02), periappendiceal fluid presence (G1: 63% vs. G2: 37%, p = 0.0005), and wider appendix diameter in US (G1: 11 mm vs. G2: 9 mm, p = 0.002) were more frequent in G1. CT grade 4 AA (G1: 67% vs. G2: 23%, p = 0.03) and higher appendix diameter in CT (G1: 14 mm vs G2: 11 mm, p = 0.008) were also found in G1 (Fig. 1). Significant delays in consultation (G1: 54 vs. G2: 34 h, p = 0.0008), higher rates of severe peritonitis (G1: 42% vs. G2: 15%, p < 0.0001), and more complicated appendicitis (G1: 38% vs. G2: 19%, p = 0.004) were noted in G1. Patients in G1 also had higher rates of postoperative intraabdominal abscess (G1: 17% vs. G2: 7% p = 0.04), readmissions (G1: 12% vs. G2: 4%, p = 0.03), reoperations (G1: 5% vs. G2: 1%, p < 0.0001), and longer total LOS (G1: 3 vs. G2: 2 days, p = 0.04) (Table 1).

Fig. 1

Uncomplicated (grade 3) and complicated (grade 4) acute appendicitis by US and CT

Table 1 Perioperative variables and outcomes after laparoscopic appendectomy


Our study found that the use of abdominal ultrasound and CT scan for the diagnosis remained similar during the COVID-19 pandemic. However, we indeed found higher rates of complicated appendicitis by both imaging modalities. Contrary to our results, previous reports have shown a significant decrease in the overall number of radiological examinations for AA.3 An increased proportion of severe cases identified by CT scan have been also reported during the pandemic.3

Our findings could be partially explained by significant delays in consultation due to the “stay-at-home” order during the quarantine.4 Higher rates of complicated appendicitis and severe peritonitis were also detected intraoperatively, along with greater postoperative morbidity. Some authors have advocated for a shift in the management of AA during the pandemic towards the use of medical treatment with antibiotics.5 Although this treatment strategy seems reasonable in uncomplicated AA, it is likely to fail in patients with complicated appendicitis and/or peritonitis.6


We objectively demonstrated through imaging and intraoperative findings that patients with AA during COVID-19 pandemic have a more severe disease at presentation. Further studies are needed to determine potential detrimental effects of quarantine and “stay home” policies during a pandemic.


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Correspondence to Cristian A. Angeramo.

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Angeramo, C.A., Dreifuss, N.H., Schlottmann, F. et al. More Severe Presentations of Acute Appendicitis During COVID-19. J Gastrointest Surg (2021).

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  • COVID-19
  • Acute appendicitis
  • Imaging findings
  • Computed tomography
  • Abdominal ultrasound