Dermatologic Surgery
Extramammary Paget's disease: Surgical treatment with Mohs micrographic surgery

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Background

Extramammary Paget's disease (EMPD) is an uncommon tumor that has a high rate of recurrence after conventional surgical treatments.

Objective

Our purpose was to establish the efficacy of Mohs micrographic surgery (MMS) in the treatment of EMPD, and to make treatment recommendations with regard to surgical margins. We also attempted to summarize the published recurrence rates of EMPD after standard surgical management.

Methods

In a retrospective chart review, pertinent demographic data, tumor data, treatment characteristics, and follow-up data were tabulated. A search of the literature for recurrence rates after MMS and non-MMS surgical treatment modalities was performed.

Results

The recurrence rate after treatment with MMS was 16% for primary EMPD and 50% for recurrent EMPD. The 5-year tumor-free rates (Kaplan-Meier analysis) were 80% for primary tumors and 56% for recurrent tumors. Using MMS, the salvage rate (and, hence, overall cure rate) was 100%. Margins of 5 cm were required to clear 97% of the tumors. The recurrence rate after non-MMS (from the literature) is 33% to 60%.

Conclusion

MMS is effective, and superior to standard surgical management in the treatment of EMPD. We recommend a 5-cm margin of normal skin if MMS cannot be offered.

Section snippets

Methods

Daily surgical logs for all the cases performed by the authors (J. A. Z.: 1983-2003; D. G. B.: 1997-2003) were reviewed and all cases of EMPD were noted. Detailed review of each patient's medical record was undertaken and all relevant data collected (Table I). Follow-up visits and telephone surveys were performed for all patients. Examination of the affected area by a physician was required to establish the presence or absence of recurrence. Recurrence was defined as the

Results

In all, 25 patients with 27 lesions of EMPD were referred for MMS. There were 12 male and 13 female patients. All patients were Caucasian. Of the tumors, 52% (14/27) involved the male gentialia/groin (including one perianal). The remaining 13 tumors were in women and consisted of 26% (7/27) vulvar, 11% (3/27) axillary, 7% (2/27) perianal, and 4% (1/27) pubic.

A total of 34 cases of MMS were performed on 19 primary tumors, 8 tumors recurrent after non-MMS, and 7 tumors recurrent after MMS. Table I

Discussion

It is clinically difficult to distinguish the margins of EMPD from normal skin. Standard surgical management of EMPD are associated with an inherently high recurrence rate, and repeated operations lead to significant morbidity and deformity. MMS offers an alternative to blind excision of EMPD, or excision with frozen-section sampling of a fraction of the margins. It offers the ability to microscopically visualize the entire margin and remove only the affected tissue and, hence, a lower

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    Funding sources: None.

    Conflicts of interest: None identified.

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