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A Novel Mohs Precision Tool

Kanevsky, Jonathan, MD*; Safran, Tyler; Viezel-Mathieu, Alex, MD*; Hemmings, Kurt; Khanna, Manish, MD, FRCP

doi: 10.1097/DSS.0000000000001297
Original Article

BACKGROUND Effective treatment by Mohs micrographic surgery requires preparation of high-quality slides.

OBJECTIVE To examine a novel tissue alignment device designed to address variability in tissue processing because of excessive sample trimming.

MATERIALS AND METHODS A device was designed to account for angular errors and unparalleled tissue embedding. A retrospective chart review was performed both with and without the use of the device over the course of a 4-year period (2012–2015).

RESULTS Between January 1, 2012, and June 10, 2014, before device implementation, mean number of stages per case was 1.65 (n = 3,680) and mean number of surgeries per day was 6.34 (n = 640). Between June 11, 2014, and October 02, 2015, with device implemented, the average number of stages per case between decreased to 1.58 (n = 2,562) and the number of daily surgeries increased to 7.05 (n = 358). This represents a significant decrease in number of stages per case by 0.07 stages (95% CI: −0.01 to −0.13, p = .02), as well as an increase in the number of cases per day by 0.71 cases (95% CI: 0.12–1.3, p < .01).

CONCLUSION Slide preparation using the novel alignment device may result in less tissue waste and more cases being performed daily.

*Division of Plastic and Reconstructive Surgery, McGill University Health Centre, Montreal, Quebec;

Division of Mohs Surgery, Jewish General Hospital, Montreal, Quebec;

Faculty of Medicine, McGill University, Montreal, Quebec

Address correspondence and reprint requests to: Jonathan Kanevsky, MD, Surgical Dermatology, Jewish General Hospital, 3755 Côte-Ste-Catherine Road, Montréal, QC H3T 1E2, or e-mail:

The authors have indicated no significant interest with commercial supporters.

K. Hemmings is the author of the patent pending for this device.

© 2018 by the American Society for Dermatologic Surgery, Inc. Published by Wolters Kluwer Health, Inc. All rights reserved.
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