Abdominal Radiology
Comparative analysis of MR imaging findings of perianal fistulas in patients with and without Crohn disease
Genghuan Ni, Hongwei Zhao, Changzhen Qi, Jie He, Peng Hu, Jihong Sun
Published 2019-04-10
Cite as Chin J Radiol, 2019, 53(4): 305-309. DOI: 10.3760/cma.j.issn.1005-1201.2019.04.012
Abstract
ObjectiveTo investigate the differences in magnetic resonance imaging characteristics between perianal-fistulas of Crohn disease (P-FCD) and perianal-fistulas of non-Crohn disease (P-FNCD).
MethodsA retrospective analysis was made of 109 patients with perianal fistula who were confirmed by clinical examinations and surgery and had complete preoperative pelvic MRI data from sir run run shaw hospital affiliated to Zhejiang University from June 2015 to March 2017. Patients were divided into P-FCD and P-FNCD groups according to whether the patient was clinically diagnosed with Crohn disease(CD).There were 59 cases in group P-FCD and 50 cases in group P-FNCD. All patients underwent pelvic MRI plain scan and enhanced scan. the classifications of perianal fistula (St. James University Hospital classification and improved Parks classification) were evaluated. The number of branches, the number of abscesses, the number of internal opening, the height of the internal opening were measured and recorded. The incidence of proctitis and anal inflammation were recorded. Van Assche score was evaluated. Measured data between patients in the P-FCD and P-FNCD groups were compared using independent sample t test (normal distribution) or non-parametric test (skewed distribution).The quantitative data were compared using cross-sectional Pearson χ2 test.
ResultsThere were significant differences in the number of branches, the number of abscesses, the number of internal opening, the height of the internal opening, the positive rate of proctitis, the positive rate of anal canalitis, and the Van Assche score between the P-FCD group and the P-FNCD group (all P<0.05). There was no significant difference in the modified Parks classification between the P-FCD group and the P-FNCD group (P>0.05).There was significant difference in the classification of St. James University Hospital between the P-FCD group and the P-FNCD group (P<0.05).
ConclusionsP-FCD is mainly composed of high complex anal fistula, which is significantly different from P-FNCD. We used St. James University Hospital classification and Van Assche score to diagnose perianal fistula in combination with clinical examinations, which was helpful for the diagnosis of P-FCD.
Key words:
Crohn disease; Perianal fistulas; Magnetic resonance image
Contributor Information
Genghuan Ni
Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou. 310006, China
Ni Genghuan is working in the Department of Radiology, the Second Hospital of Jiaxing, Jiaxing 314000, China
Hongwei Zhao
Department of Radiology, the Second Hospital of Jiaxing, Jiaxing 314000, China
Changzhen Qi
Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou. 310006, China
Jie He
Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou. 310006, China
Peng Hu
Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou. 310006, China
Jihong Sun
Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou. 310006, China
