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Objective: Determining the tumor margin is the main problem in penoscrotal extramammary Paget's disease (PEMPD) surgery. This study aimed to explore the role of modified slow Mohs circular skin biopsy in determining the tumor margin in patients with PEMPD before operation. Methods: Thirty-six PEMPD patients were divided into the control group and the observation group according to the simple randomization method. The control group, which consisted of 16 patients, underwent wide local excision, and the observation group, which consisted of 20 patients, underwent a modified slow Mohs circular skin biopsy to determine the tumor margin before surgery. The duration of surgery, number of frozen sections, satisfaction with the appearance of the skin, tumor recurrence rate, and incidence of functional sequelae were statistically analyzed. Results: The number of frozen sections, duration of surgery, incidence of functional sequelae, and tumor recurrence rate in the observation group were lower than in the control group. The satisfaction with the appearance of the skin was higher in the observation group than in the control group, and the difference was statistically significant (P

Determining the tumor margin is the main problem in penoscrotal extramammary Paget's disease (PEMPD) surgery. This study aimed to explore the role of modified slow Mohs circular skin biopsy in determining the tumor margin in patients with PEMPD before operation. Thirty-six PEMPD patients were divided into the control group and the observation group according to the simple randomization method. The control group, which consisted of 16 patients, underwent wide local excision, and the observation group, which consisted of 20 patients, underwent a modified slow Mohs circular skin biopsy to determine the tumor margin before surgery. The duration of surgery, number of frozen sections, satisfaction with the appearance of the skin, tumor recurrence rate, and incidence of functional sequelae were statistically analyzed. The number of frozen sections, duration of surgery, incidence of functional sequelae, and tumor recurrence rate in the observation group were lower than in the control group. The satisfaction with the appearance of the skin was higher in the observation group than in the control group, and the difference was statistically significant (P < 0.05). Modified slow Mohs circular skin biopsy can determine the tumor margin before surgery and reduce the number of frozen sections, tumor recurrence rate, and the incidence of functional sequelae. It also increases the postoperative satisfaction of patients. [ABSTRACT FROM AUTHOR]