cqvip:BACKGROUND Epidermoid cysts can be found at any location in the human body.However,perianal epidermoid cysts are extremely rare and only a few cases have been reported.As far as we know,there is no special literature on the value of contrast-enhanced computed tomography(CT)for the diagnosis of perianal epidermoid cysts.CASE SUMMARY A 60-year-old male patient presented to the department of general surgery of PLA Strategic Support Force Characteristic Medical Center with the chief complaint of a mass in the perianal region gradually expanding for more than 30 years and perianal discomfort upon sitting for a preceding period of 2 mo.Physical examination revealed a painless mass in the left perianal region.Contrast-enhanced CT was used for preoperative diagnosis.The patient was treated by total mass excision under epidural anesthesia.Postoperative pathological examination revealed the presence of a perianal epidermoid cyst.The patient showed a satisfactory recovery during the 6-month follow-up period.CONCLUSION Contrast-enhanced CT may be a beneficial,useful,and convenient approach for assistance for preoperative diagnosis and surgical decision-making for patients with perianal epidermoid cysts.
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