Tumors occurring between the upper edge of the external anal sphincter and the dentate line are generally referred to as anal canal cancer. This type of malignant tumor is relatively rare, accounting for 1-4% of large intestine cancers. However, due to its unique location and severe consequences, it remains highly significant for patients.

bubble_chart Diagnosis

Diagnosis: Cutaneous pruritus and stabbing pain in the anal region, hardened skin or localized pre-existing scar tissue, some presenting as localized nodules or ulcer formation. A pathological examination of locally collected tissue can confirm the diagnosis.

The early symptoms of perianal cancer mainly include small lumps around the anal margin, which grow slowly and are painless and non-pruritic. As they enlarge, ulcers, bleeding, and pain may develop. The pain becomes more pronounced when the anal canal and anal sphincter are involved.

bubble_chart Treatment Measures

For small nodules with a diameter of 2 cm or less and low-grade malignancy, electrocautery or local wide excision may be performed. Otherwise, abdominoperineal resection is required. Other treatments are the same as for rectal cancer.