First-Line Diagnostic Evaluation with MRI of Children Suspected of Having Acute Appendicitis

Authors

Raza Mushtaq, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.Follow
Sarah M. Desoky, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Frank Morello, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Dorothy Gilbertson-Dahdal, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Geetha Gopalakrishnan, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Aaron Leetch, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Srinivasan Vedantham, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Bobby Kalb, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Diego R. Martin, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.
Unni K. Udayasankar, From the Departments of Medical Imaging (R.M., S.M.D., F.M., D.G., S.V., B.K., D.R.M., U.K.U.), Pediatrics (G.G.), and Pediatric Emergency Medicine (A.L.), University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724.

Document Type

Article

Abstract

Background Advances in abdominal MRI have enabled rapid, free-breathing imaging without the need for intravenous or oral contrast material. The use of MRI as the primary imaging modality for suspected appendicitis has not been previously studied. Purpose To determine the diagnostic performance of MRI as the initial imaging modality in children suspected of having acute appendicitis. Materials and Methods The study included consecutive patients 18 years of age and younger presenting with acute abdominal pain at a tertiary care institution from January 2013 through June 2016 who subsequently underwent an unenhanced MRI examination as the primary diagnostic imaging modality. Electronic medical records and radiology reports were retrospectively evaluated for the feasibility and diagnostic performance of MRI, with surgical pathology and follow-up electronic records as reference standards. Statistical analyses were performed by using simple binomial proportions to quantify sensitivity, specificity, and accuracy, and exact 95% confidence intervals (CIs) were obtained. Results After exclusions, 402 patients (median age: 13 years; interquartile range [IQR], 9-15 years; 235 female patients; 167 male patients) were included. Sedation for MRI was required in 13 of 402 patients (3.2%; 95% CI: 1.7%, 5.5%). The appendix was visualized in 349 of 402 patients (86.8%; 95% CI: 83.1%, 90%); for the remaining patients, a diagnosis was provided on the basis of secondary signs of appendicitis. The sensitivity, specificity, and accuracy of MRI as the primary diagnostic imaging modality for the evaluation of acute appendicitis were 97.9% (95 of 97; 95% CI: 92.8%, 99.8%), 99% (302 of 305; 95% CI: 97.2%, 99.8%), and 98.8% (397 of 402; 97.1%, 99.6%), respectively. Among patients with negative findings for appendicitis at MRI, an alternate diagnosis was provided in 113 of 304 patients (37.2%; 95% CI: 31.7%, 42.9%). Conclusion When performed as the initial imaging modality in children suspected of having acute appendicitis, MRI examinations had high diagnostic performance for the diagnosis of acute appendicitis and in providing alternative diagnoses. © RSNA, 2019 See also the editorial by Dillman and Trout in this issue.

Medical Subject Headings

Abdominal Pain (etiology); Acute Disease; Adolescent; Appendicitis (diagnosis); Child; Child, Preschool; Feasibility Studies; Female; Humans; Infant; Infant, Newborn; Magnetic Resonance Imaging (standards); Male; Retrospective Studies; Sensitivity and Specificity

Publication Date

4-1-2019

Publication Title

Radiology

E-ISSN

1527-1315

Volume

291

Issue

1

First Page

170

Last Page

177

PubMed ID

30747595

Digital Object Identifier (DOI)

10.1148/radiol.2019181959

Recommended Citation

Mushtaq, Raza; Desoky, Sarah M.; Morello, Frank; Gilbertson-Dahdal, Dorothy; Gopalakrishnan, Geetha; Leetch, Aaron; Vedantham, Srinivasan; Kalb, Bobby; Martin, Diego R.; and Udayasankar, Unni K., "First-Line Diagnostic Evaluation with MRI of Children Suspected of Having Acute Appendicitis" (2019). Neuroradiology. 67.
https://scholar.barrowneuro.org/neuroradiology/67