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Pseudo-pneumatosis of the gastrointestinal tract: its incidence and the accuracy of a checklist supported by artificial intelligence (AI) techniques to reduce the misinterpretation of pneumatosis

Abstract

Purpose

To assess the incidence of erroneous diagnosis of pneumatosis (pseudo-pneumatosis) in patients who underwent an emergency abdominal CT and to verify the performance of imaging features, supported by artificial intelligence (AI) techniques, to reduce this misinterpretation.

Methods

We selected 71 radiological reports where the presence of pneumatosis was considered definitive or suspected. Surgical findings, clinical outcomes, and reevaluation of the CT scans were used to assess the correct diagnosis of pneumatosis. We identified four imaging signs from literature, to differentiate pneumatosis from pseudo-pneumatosis: gas location, dissecting gas in the bowel wall, a circumferential gas pattern, and intramural gas beyond a gas-fluid/faecal level. Two radiologists reevaluated in consensus all the CT scans, assessing the four above-mentioned variables. Variable discriminative importance was assessed using the Fisher exact test. Accurate and statistically significant variables (p-value < 0.05, accuracy > 75%) were pooled using boosted Random Forests (RFs) executed using a Leave-One-Out cross-validation (LOO cv) strategy to obtain unbiased estimates of individual variable importance by permutation analysis. After the LOO cv, the comparison of the variable importance distribution was validated by one-sided Wilcoxon test.

Results

Twenty-seven patients proved to have pseudo-pneumatosis (error: 38%). The most significant features to diagnose pneumatosis were presence of dissecting gas in the bowel wall (accuracy: 94%), presence of intramural gas beyond a gas-fluid/faecal level (accuracy: 86%), and a circumferential gas pattern (accuracy: 78%).

Conclusion

The incidence of pseudo-pneumatosis can be high. The use of a checklist which includes three imaging signs can be useful to reduce this overestimation.

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Data availability

Data for this study were obtained through PubMed search. Original material and data from the presented research support our claim and comply with field standards.

Code availability

Matlab code was used in this research.

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Author information

Affiliations

Authors

Contributions

A.A.E, L.C., S.Z., and C.G. contributed to the study conception and design, and literature search and data analysis were performed by E.C., S.Z., C.G., E.A., O.C.

First draft of the manuscript was written by A.A.E., S.Z., E.C., L.C., C.G., and E.A. and was critically reviewed and edited by A.A.E, E.C., E.A., L.C., O.C, and G.C. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Andrea Alessandro Esposito.

Ethics declarations

Ethics approval

The study was approved by the Ethics Committee of Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico and the patient’s informed consent was waived for its retrospective nature.

Consent to participate

The patient’s informed consent was waived by the Ethics Committee of Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico for the retrospective nature of the study.

Conflict of interest

The authors declare that they have no conflict of interest.

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Cite this article

Esposito, A.A., Zannoni, S., Castoldi, L. et al. Pseudo-pneumatosis of the gastrointestinal tract: its incidence and the accuracy of a checklist supported by artificial intelligence (AI) techniques to reduce the misinterpretation of pneumatosis. Emerg Radiol 28, 911–919 (2021). https://doi.org/10.1007/s10140-021-01932-3

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Keywords

  • Pneumatosis intestinalis
  • Pseudo-pneumatosis intestinalis
  • Multidetector computed tomography
  • Abdomen, acute
  • Emergency