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{"current_user":null,"inclusions":[{"imageId":21222315,"studyId":47797,"caseSlug":"schematic-anorectal-clock-for-reporting","caption":"Figure 1: clock schematic for reporting","thumbnail":"https://prod-images-static.radiopaedia.org/images/21222315/a83685b5eb86de8fb6b0c485ebe9ed_big_gallery.jpeg","isStack":false,"diagnosticCertainty":"not_applicable"},{"imageId":63784511,"studyId":142666,"caseSlug":"goodsalls-rule","caption":"Figure 2: Goodsall's rule","thumbnail":"https://prod-images-static.radiopaedia.org/images/63784511/1eedd74c64ffe43e2e54ae9016bea8304e0aeff6ad2a01ba2d0afb4aea267a04_big_gallery.jpeg","isStack":false,"diagnosticCertainty":"not_applicable"},{"imageId":65362084,"studyId":148440,"caseSlug":"parks-classification-of-perianal-fistula-illustrations","caption":"Figure 3: Park’s classification (illustrations)","thumbnail":"https://prod-images-static.radiopaedia.org/images/65362084/a977ba59ae7780c59b4482f1f56258c1e336c64c1c8d5a29fa5e42d9bd48ef79_big_gallery.jpeg","isStack":false,"diagnosticCertainty":"not_applicable"},{"imageId":24090000,"studyId":51283,"caseSlug":"perianal-fistula-communicating-with-the-rectum-on-fistulogram-1","caption":"Case 1: on fistulography","thumbnail":"https://prod-images-static.radiopaedia.org/images/24090000/67bb47e2abc929e9ab30ac41abda08_big_gallery.jpeg","isStack":false,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":5338750,"studyId":26573,"caseSlug":"perianal-fistula-3","caption":"Case 2: on ultrasound","thumbnail":"https://prod-images-static.radiopaedia.org/images/5338750/21bde5d4467fe1bba0cf0981392d85_big_gallery.jpg","isStack":false,"diagnosticCertainty":"probable"},{"imageId":8536030,"studyId":32002,"caseSlug":"perianal-fistula-high-trans-sphincteric-1","caption":"Case 3: on 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fistula","thumbnail":"https://prod-images-static.radiopaedia.org/images/24733007/eeb9a9076049a386b1877cbe602f1a_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":4061334,"studyId":23616,"caseSlug":"peri-anal-fistula-trans-sphincteric-1","caption":"Case 7: grade 3 transsphincteric fistula","thumbnail":"https://prod-images-static.radiopaedia.org/images/4061334/9ce1c8dcc4f98907f6bbdb4e61ec97_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":9344329,"studyId":33575,"caseSlug":"suprasphincteric-perianal-fistula-1","caption":"Case 8: grade 5 suprasphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/9344329/e94b3b9e0a174874b11e389131b229_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":9375342,"studyId":33638,"caseSlug":"perianal-fistula-grade-4-transsphincteric-3","caption":"Case 9: transsphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/9375342/718e87d898048c897521eadff8683f703e3407fb9879019b3e6aab11b7585c93_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":13615893,"studyId":39405,"caseSlug":"perianal-fistula-communicating-with-the-vagina-1","caption":"Case 10: with vaginal communication","thumbnail":"https://prod-images-static.radiopaedia.org/images/13615893/a94576df24e086ee97a7b863217f8e_big_gallery.jpg","isStack":false,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":1896990,"studyId":17249,"caseSlug":"perianal-fistula-with-supralevator-abscess","caption":"Case 11: grade 5, with supralevator abscess","thumbnail":"https://prod-images-static.radiopaedia.org/images/1896990/42c31cd52d3d00d3af0bd9601eb41a_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":3099685,"studyId":22371,"caseSlug":"intersphincteric-anal-fistula","caption":"Case 12: grade 1 posterior intersphincteric fistula","thumbnail":"https://prod-images-static.radiopaedia.org/images/3099685/97d8a08a601688b6038f97dd30db88_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":4732877,"studyId":25247,"caseSlug":"perianal-sinus","caption":"Case 13","thumbnail":"https://prod-images-static.radiopaedia.org/images/4732877/0a6516f0f1286f093e4cc7a1c79d1a_big_gallery.jpg","isStack":true,"diagnosticCertainty":null},{"imageId":5490829,"studyId":26883,"caseSlug":"perianal-fistula-4","caption":"Case 14: transsphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/5490829/dd25717b24165e585fef26cab96b29_big_gallery.jpg","isStack":false,"diagnosticCertainty":"possible"},{"imageId":8323034,"studyId":31757,"caseSlug":"perianal-fistula-5","caption":"Case 15","thumbnail":"https://prod-images-static.radiopaedia.org/images/8323034/726f11f7144b5ee0a942d910472206_big_gallery.jpg","isStack":false,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":23983096,"studyId":51136,"caseSlug":"perianal-fistula-volume-mri-1","caption":"Case 16: transsphincteric fistula","thumbnail":"https://prod-images-static.radiopaedia.org/images/23983096/218dcf1fece28acd3676ba980a379d_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":29509080,"studyId":58224,"caseSlug":"perianal-fistula-grade-v","caption":"Case 17","thumbnail":"https://prod-images-static.radiopaedia.org/images/29509080/79016d14696a05f94735365aff6316_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":14826656,"studyId":40739,"caseSlug":"perianal-fistula-intersphincteric-with-intersphincteric-abscess","caption":"Case 18: intersphincteric with abscess","thumbnail":"https://prod-images-static.radiopaedia.org/images/14826656/975cfc2b87a6885c427d7078d4db5f_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":39502424,"studyId":68602,"caseSlug":"perianal-fistula-complex-with-multiple-ramifications-3","caption":"Case 19","thumbnail":"https://prod-images-static.radiopaedia.org/images/39502424/64e0c8e74c9d88cc276e03167b93d5_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":39819271,"studyId":68777,"caseSlug":"transsphincteric-perianal-fistula-1","caption":"Case 20: transsphincteric perianal fistula","thumbnail":"https://prod-images-static.radiopaedia.org/images/39819271/0a455f95b61d6b49e5883436173424_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":38678676,"studyId":67747,"caseSlug":"perianal-abscess-10","caption":"Case 21: intersphincteric fistula with perianal abscess","thumbnail":"https://prod-images-static.radiopaedia.org/images/38678676/4adc5df4b62972a5e6fd0c74281ce4_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":54357444,"studyId":102802,"caseSlug":"perianal-fistula-intersphincteric-2","caption":"Case 22: intersphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/54357444/022_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":56937348,"studyId":116288,"caseSlug":"suprasphincteric-anal-fistula","caption":"Case 23: suprasphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/56937348/432299e12f59452a07f19548be76d489fccf87c707e8e1c4de9391ce8bd87bd9_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":59784867,"studyId":127146,"caseSlug":"perianal-fistula-inter-sphincteric-type-6","caption":"Case 24: intersphincteric ","thumbnail":"https://prod-images-static.radiopaedia.org/images/59784867/f5fd9fbebe15f398ad3fafa9dd6c4f9829b02e2ede94765337b1faeb4c44edf9_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":59900825,"studyId":127727,"caseSlug":"perianal-fistula-intersphincteric-type","caption":"Case 25: intersphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/59900825/41371fd0b40b20115e5b352ffbb92f0664e61fc6627738fca25e3db3d15befd9_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":62682724,"studyId":138148,"caseSlug":"perianal-fistula-intersphincteric-type-2","caption":"Case 26: intersphincteric","thumbnail":"https://prod-images-static.radiopaedia.org/images/62682724/3b1d7b36198b439a2aefa8fffc6286895fecef1ae69ea37a3c67e6e16bd3c6d9_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_unsubstantiated"},{"imageId":63078973,"studyId":139740,"caseSlug":"perianal-fistula-fistulogram-1","caption":"Case 27: contrast fistulogram","thumbnail":"https://prod-images-static.radiopaedia.org/images/63078973/963fc60f70f0ed8c29c83ae3e8b417ef66c3bbbebba145a5dc5f9f0fa5d1626b_big_gallery.jpeg","isStack":false,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":64770181,"studyId":146425,"caseSlug":"perianal-fistula-23","caption":"Case 28: fistulography","thumbnail":"https://prod-images-static.radiopaedia.org/images/64770181/346197e32609544bac9bbe167c949d485589464f7418acd201c39f2ed7edc2ff_big_gallery.jpeg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"}],"ddx_inclusions":[{"imageId":925555,"studyId":13646,"caseSlug":"perianal-abscess","caption":"Perianal abscess","thumbnail":"https://prod-images-static.radiopaedia.org/images/925555/626bf5a8bf57906755ad7069056e1e_big_gallery.jpg","isStack":false,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":9278489,"studyId":33450,"caseSlug":"perianal-abscess-8","caption":"Perianal abscess","thumbnail":"https://prod-images-static.radiopaedia.org/images/9278489/0f8f5251ad85c454b23f40a8cf1696_big_gallery.jpg","isStack":true,"diagnosticCertainty":"confirmed_substantiated"},{"imageId":55526644,"studyId":109330,"caseSlug":"pilonidal-sinus-intergluteal-mri","caption":"Pilonidal 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