A patient came to me, Ms. Liu, female, 60 years old, complained of anal swelling and discomfort for more than 2 years, stool 1-2 times a day, smooth discharge, no perianal pain and abnormal discharge, treated with many drugs, but still no improvement, seriously affecting Ms. Liu’s daily life; after a series of examinations, anal finger diagnosis can be found in the 6-point anal sinus hard nodules, anoscopy can be seen in the same direction of anal papilla hypertrophy; rectal 3D ultrasound suggests that her 1-point and The 6-point sinus infection lesion was detected by rectal 3D ultrasound. Sinusitis is an acute and chronic inflammatory disease occurring in the anal flap, sinuses and anal glands. It is an important potential site of infection, and it is estimated that about 85% of rectal lesions are related to anal sinus infection. The symptoms include: 1, anal discomfort: patients initially no obvious symptoms, often have a sense of incomplete defecation, a sense of foreign body in the anus and a feeling of falling, serious cases can be accompanied by a sense of urgency and heaviness. Pain: sometimes there is burning and stinging pain, when defecating because of fecal pressure anal fossa, can make the anal pain increased, the initial not very intense, a few minutes can disappear. If the anal sphincter is contracted due to inflammatory stimulation, it can be aggravated, and in serious cases, it can spread to the buttocks and the posterior part of the femur. 3, anal dampness, secretions: due to the inflammatory edema of the anal saphenous fossa and anal flap can cause anal atresia, anal dampness, itching; the acute stage is often accompanied by difficulty in stool, stool often with mucus, usually before defecation, sometimes accompanied by a small amount of blood in the stool. Sinusitis is usually treated non-surgically, but for those with recurrent attacks and/or pus in the anal fossa, or with anal papillomegaly or fistula formation, surgical treatment is appropriate.