Abstract
Purpose
This study was devised to evaluate the imaging appearances of the interureteric crest (IUC) of the bladder on magnetic resonance imaging (MRI). The primary objective was to determine how commonly the IUC was observed on pelvic MRI examinations. The secondary objectives were to determine the average size of the IUC, its MRI signal characteristics and whether there is variation between men and women.
By defining the imaging findings we hope to prevent misinterpretation of normal anatomy on MRI and, therefore, prevent unnecessary further investigations and procedures.
Methods
We retrospectively reviewed 114 adult patient’s magnetic resonance imaging examinations of the pelvis. Two readers independently recorded information about the presence and characteristics of the IUC with a third reader used to arbitrate in cases of disagreement.
Results
The IUC was demonstrated on MRI in 75% of patients. It was best observed on T2w sequences as a continual ridge of low signal intensity between the ureters. The mean AP diameter of the IUC at its mid-point on the sagittal images was 2.4 mm.
Conclusions
The IUC is often seen on MRI on T2w images of a non-collapsed bladder. Its characteristic appearance can be used to help the reporting radiologist confidently differentiate identify this normal structure from an area of focal bladder wall thickening that might be misinterpreted as a bladder tumor.
References
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PA: Data collection, manuscript writing, data analysis. PW: Data collection, manuscript writing. SF: Project development, data collection, manuscript writing.
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None of the authors have potential conflicts of interest or funding to disclose.
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This study was registered with the audit and quality improvement team at the investigating institution.
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Abernethy, P., Williams, P. & Freeman, S. The magnetic resonance imaging appearances of the interureteric crest of the urinary bladder. Surg Radiol Anat 42, 1339–1343 (2020). https://doi.org/10.1007/s00276-020-02501-y
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DOI: https://doi.org/10.1007/s00276-020-02501-y