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Anal Fistula: What It Is, Symptoms, Treatment & Surgery

Healthdirect

Anal fissure

Albany Gastroenterology Consultants

Anal Fissure, Abscess and Fistula

Manhattan Gastroenterology

Anal Cancer: Are You at Risk? Manhattan Gastroenterology

Surgeons 101

Anal Fissures

Mayo Clinic

The anal canal

Wikipedia

Anal triangle

Cureus

Cureus

Manhattan Gastroenterology

What's That Lump in My Butt?

Dana

Anal Cancer: How to Diagnose, Staging & Treatment

Memorial Sloan Kettering Cancer Center

About Anal Fissures

MedlinePlus

Anal fissure

Healthline

Is Bleeding After Anal Sex Normal? And 5 Other FAQs

Southlake General Surgery

Anal Fissure Symptoms, Diagnosis & Treatment

Wikipedia

Anal cancer