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21.06.2020 | Original Contributions | Ausgabe 11/2020 Open Access

Obesity Surgery 11/2020

Swallow Magnetic Resonance Imaging Compared to 3D-Computed Tomography for Pouch Assessment and Hiatal Hernias After Roux-en-Y Gastric Bypass

Obesity Surgery > Ausgabe 11/2020
Daniel M. Felsenreich, Michael A. Arnoldner, Felix B Langer, Christoph Bichler, Natalie Vock, Katharina Steinlechner, Mahir Gachabayov, Aram Rojas, Dietrich Beitzke, Thomas Mang, Gerhard Prager, Christiane Kulinna-Cosentini
Wichtige Hinweise
Daniel M. Felsenreich and Michael A. Arnoldner contributed equally to this work.

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Weight regain and weight loss failure after bariatric surgery are important issues that may require a weight regain procedure. Three-dimensional-computed tomography (3D-CT) is a well-established method allowing exact measurements of pouch volume. The aims of this study were to prove the applicability of swallow MRI as a non-ionizing procedure and compare it to 3D-CT in patients after weight regain procedures following RYGB.

Materials and Methods

Twelve post-RYGB patients who had a follow-up operation for weight regain before 12/2017 were included in this prospective study. Swallow MRI and 3D-CT were performed in each patient to evaluate the size of the anastomosis, pouch volume, and intrathoracic pouch migration (ITM).


Mean pouch volume in swallow MRI and 3D-CT were 40.4 ± 21.0 ml and 43.5 ± 30.2 ml, respectively (p = 0.83), and pouch diameter at the maximal distention was 35.3 ± 5.9 ml (MRI) and 31.0 ± 10.0 ml (CT) (p = 0.16). The rate of ITM was 75% in both examinations (p = 1.0).


Swallow MRI is a valid method for the assessment of pouch volume in different phases of the swallowing process and is comparable to 3D-CT. The diagnosis of ITM using swallow MRI was equal to 3D-CT.

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