<unk>  is a type of<unk>  which arises from the anus, the distal orifice of the gastrointestinal tract. It is a distinct entity from the more common colorectal<unk> . The etiology, risk factors, clinical progression, staging, and treatment are all different.<unk>  is typically a squamous cell carcinoma that arises near the squamocolumnar junction and its often linked to human papillomavirus (HPV) infection. It may be keratinizing (basaloid) or non-keratinizing (cloacogenic). Other types of<unk>  are adenocarcinoma, lymphoma, sarcoma or melanoma. Treatment depends on the stage of the disease at the time of diagnosis.
Anal cancer
Anal fissure
Anal abscess
Anal fistula
Genital ulcer
Genital ulcer disease
Perianal abscess
Anal dysplasia