Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas

Background: Fistula-in-ano can be defined as a hollow tract or cavity which is lined by granulation tissue. In case of fistula-in-ano, one end of this fistula opens in the anal canal whereas the other end is located in perianal area. Fistula-in-ano can considerably affect quality of life of an indiv...

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Autores principales:	Saurabh S Kakani, Devidas B Dahiphale, Saurabh G Padiya, Vimal G Dugad, Shivaji M Pole, Tanushree A Poddar
Formato:	article
Lenguaje:	EN
Publicado:	Manipal College of Medical Sciences, Pokhara 2021
Materias:	magnetic resonance imaging mr fistulogram secondary tracts/ramifications sphincter muscles transmural inflammation Medicine R
Acceso en línea:	https://doi.org/10.3126/ajms.v12i12.39695 https://doaj.org/article/de296b9252754df38b9ad6363a109997
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spelling	oai:doaj.org-article:de296b9252754df38b9ad6363a1099972021-12-01T14:28:14ZRole of magnetic resonance imaging in diagnosis and grading of perianal fistulashttps://doi.org/10.3126/ajms.v12i12.396952467-91002091-0576https://doaj.org/article/de296b9252754df38b9ad6363a1099972021-12-01T00:00:00Zhttps://www.nepjol.info/index.php/AJMS/article/view/39695https://doaj.org/toc/2467-9100https://doaj.org/toc/2091-0576Background: Fistula-in-ano can be defined as a hollow tract or cavity which is lined by granulation tissue. In case of fistula-in-ano, one end of this fistula opens in the anal canal whereas the other end is located in perianal area. Fistula-in-ano can considerably affect quality of life of an individual because of perianal discharge of blood and pus. Imaging of these fistulas is an important part of management and MR imaging is important in assessing relationship between the fistulous tract and sphincter muscles. Moreover, MR imaging can reliably demonstrate transmural inflammation, secondary tracts/ramifications, and abscesses which cannot be diagnosed on the basis of conventional fistulography. Aims and Objectives: The aim of the study was to evaluate role of MRI in diagnosis and grading of perianal fistulae. Materials and Methods: This was a retrospective observational study, in which 60 patients with fistula-in-ano were included on the basis of a predefined inclusion and exclusion criteria. MR imaging of patients was done by 1.5 T MRI machine. Before MR imaging normal saline was injected in the fistulous tract from secondary/external opening, that is, opening around perianal area. Three plane images were obtained in all the cases. T1W, T2W, and STIR image sequences were obtained parallel to pelvic diaphragm. Coronal cuts were imaged parallel to anal canal. FAT suppressed T1W and T2W images in all cases. Type and grade of fistula were determined in all the cases. P < 0.05 was taken as statistically significant. Results: Out of total 60 patients, there were 46 (76.66%) males and 14 (23.33%) were females with a M:F ratio of 1:0.30. The mean age of male and female patients was found to be 41.93±8.96 years and 44.04±7.46 years, respectively. The most common type of fistula was found to be trans-sphincteric fistula which was seen in 31 (51.6%) cases followed by intersphencteric fistula 22 (36.6%). Extrasphincteric and suprasphincteric fistulae were relatively uncommon and were seen in 4 (6.66%) and 3 (5%) cases, respectively. MRI was accurate in diagnosis of the tract with position of internal opening and any abscess cavity or secondary tract in 23 patients. Therefore, the diagnostic accuracy of MRI was found to be 95.4%. Conclusion: MRI is an excellent tool in assessment of perianal fistula. It not only helps in precisely locating fistulous tract but also can demonstrate relationship between the fistulous tract and sphincter muscles. Moreover, it can very well demonstrate transmural inflammation, secondary tracts/ramifications, and abscesses which cannot be assessed by conventional fistulograms.Saurabh S KakaniDevidas B Dahiphale Saurabh G Padiya Vimal G Dugad Shivaji M Pole Tanushree A Poddar Manipal College of Medical Sciences, Pokharaarticlemagnetic resonance imagingmr fistulogramsecondary tracts/ramificationssphincter musclestransmural inflammationMedicineRENAsian Journal of Medical Sciences, Vol 12, Iss 12, Pp 140-146 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	magnetic resonance imaging mr fistulogram secondary tracts/ramifications sphincter muscles transmural inflammation Medicine R
spellingShingle	magnetic resonance imaging mr fistulogram secondary tracts/ramifications sphincter muscles transmural inflammation Medicine R Saurabh S Kakani Devidas B Dahiphale Saurabh G Padiya Vimal G Dugad Shivaji M Pole Tanushree A Poddar Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
description	Background: Fistula-in-ano can be defined as a hollow tract or cavity which is lined by granulation tissue. In case of fistula-in-ano, one end of this fistula opens in the anal canal whereas the other end is located in perianal area. Fistula-in-ano can considerably affect quality of life of an individual because of perianal discharge of blood and pus. Imaging of these fistulas is an important part of management and MR imaging is important in assessing relationship between the fistulous tract and sphincter muscles. Moreover, MR imaging can reliably demonstrate transmural inflammation, secondary tracts/ramifications, and abscesses which cannot be diagnosed on the basis of conventional fistulography. Aims and Objectives: The aim of the study was to evaluate role of MRI in diagnosis and grading of perianal fistulae. Materials and Methods: This was a retrospective observational study, in which 60 patients with fistula-in-ano were included on the basis of a predefined inclusion and exclusion criteria. MR imaging of patients was done by 1.5 T MRI machine. Before MR imaging normal saline was injected in the fistulous tract from secondary/external opening, that is, opening around perianal area. Three plane images were obtained in all the cases. T1W, T2W, and STIR image sequences were obtained parallel to pelvic diaphragm. Coronal cuts were imaged parallel to anal canal. FAT suppressed T1W and T2W images in all cases. Type and grade of fistula were determined in all the cases. P < 0.05 was taken as statistically significant. Results: Out of total 60 patients, there were 46 (76.66%) males and 14 (23.33%) were females with a M:F ratio of 1:0.30. The mean age of male and female patients was found to be 41.93±8.96 years and 44.04±7.46 years, respectively. The most common type of fistula was found to be trans-sphincteric fistula which was seen in 31 (51.6%) cases followed by intersphencteric fistula 22 (36.6%). Extrasphincteric and suprasphincteric fistulae were relatively uncommon and were seen in 4 (6.66%) and 3 (5%) cases, respectively. MRI was accurate in diagnosis of the tract with position of internal opening and any abscess cavity or secondary tract in 23 patients. Therefore, the diagnostic accuracy of MRI was found to be 95.4%. Conclusion: MRI is an excellent tool in assessment of perianal fistula. It not only helps in precisely locating fistulous tract but also can demonstrate relationship between the fistulous tract and sphincter muscles. Moreover, it can very well demonstrate transmural inflammation, secondary tracts/ramifications, and abscesses which cannot be assessed by conventional fistulograms.
format	article
author	Saurabh S Kakani Devidas B Dahiphale Saurabh G Padiya Vimal G Dugad Shivaji M Pole Tanushree A Poddar
author_facet	Saurabh S Kakani Devidas B Dahiphale Saurabh G Padiya Vimal G Dugad Shivaji M Pole Tanushree A Poddar
author_sort	Saurabh S Kakani
title	Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
title_short	Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
title_full	Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
title_fullStr	Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
title_full_unstemmed	Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
title_sort	role of magnetic resonance imaging in diagnosis and grading of perianal fistulas
publisher	Manipal College of Medical Sciences, Pokhara
publishDate	2021
url	https://doi.org/10.3126/ajms.v12i12.39695 https://doaj.org/article/de296b9252754df38b9ad6363a109997
work_keys_str_mv	AT saurabhskakani roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas AT devidasbdahiphale roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas AT saurabhgpadiya roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas AT vimalgdugad roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas AT shivajimpole roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas AT tanushreeapoddar roleofmagneticresonanceimagingindiagnosisandgradingofperianalfistulas
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Role of magnetic resonance imaging in diagnosis and grading of perianal fistulas

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