Diagnostic Accuracy of Magnetic Resonance Imaging in Detection of Perianal Fistula keeping Surgical Findings as Gold Standard

Abstract

An abnormal connection between the rectum or canal and the anal skin is called as a perianal fistula (PAF). MRI is considered as a gold standard for the imaging of PAF because of its operator dependence, non-invasive nature, excellent soft tissue contrast, superior field of view and multiplanar capabilities. Objective: To assess the validity of magnetic resonance imaging in detecting perianal fistulas while using surgical findings as the gold standard. Methods: From 1 January 2021 to 30 January 2022, a cross-validation research was carried out in the radiology department at Memon Medical Institute Hospital in Karachi, Pakistan. The research comprised 153 individuals with PAF ranging in age from 18 to 70 years and of either gender. A 1.5 T MR scanner was used to obtain the MRI. All techniques used a phased-array coil for image capture in all circumstances. The imaging volume encompassed the distal rectum, anal canal, and subcutaneous tissues. Fat saturation pictures were taken in the oblique, axial, and coronal planes. A radiologist examined images, and pertinent patient data were noted on a pre-drafted proforma. Histopathological and post-surgical results were acquired and documented. Results: The validity of MRI for the diagnosis of PAF was 82.4% by taking surgical findings as gold standard. Conclusion: For the assessment of PAF and the detection of abscesses, MRI is a beneficial and reliable preoperative examination