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Differences in dermoscopic images from nonpolarized dermoscope and polarized dermoscope influence the diagnostic accuracy and confidence level: a pilot study


Wang, S Q; Dusza, S W; Scope, A; Braun, R P; Kopf, A W; Marghoob, A A (2008). Differences in dermoscopic images from nonpolarized dermoscope and polarized dermoscope influence the diagnostic accuracy and confidence level: a pilot study. Dermatologic Surgery, 34(10):1389-1395.

Abstract

BACKGROUND: Studies have demonstrated differences in colors and dermoscopic structures observed with polarized dermoscopes (PDs) and nonpolarized dermoscopes (NPDs). OBJECTIVE: The objective was to evaluate whether diagnosis and diagnostic confidence changes when viewing dermoscopic images from NPDs and PDs. METHODS: A total of 100 dermatologists participated in the study. Twenty-five pigmented lesions were shown in the study, consisting of 7 seborrheic keratoses (SK), 3 basal cell carcinomas, 2 atypical nevi, 5 malignant melanomas (MM), 3 dermatofibromas, 3 blue nevi, and 2 hemangiomas. Two images of each lesion (one NPD and one PD) were included. The McNemar test and paired t-test were used for the statistical analysis. RESULTS: Ninety-one participants completed the study. Significant differences in the diagnoses were observed for the SK, atypical nevus, and MM images. Seventy-five percent and 59% of the final participants correctly diagnosed SK when presented with the NPD and PD images, respectively. For MM, 23 and 34% made the correct diagnoses with the NPD and PD images, respectively. CONCLUSIONS: Viewing lesions with NPD versus PD can affect the diagnosis and diagnostic confidence of physicians that are novices with dermoscopy. Further studies including physicians at different expertise levels and a larger sample of lesions are needed to further explore the differences.

Abstract

BACKGROUND: Studies have demonstrated differences in colors and dermoscopic structures observed with polarized dermoscopes (PDs) and nonpolarized dermoscopes (NPDs). OBJECTIVE: The objective was to evaluate whether diagnosis and diagnostic confidence changes when viewing dermoscopic images from NPDs and PDs. METHODS: A total of 100 dermatologists participated in the study. Twenty-five pigmented lesions were shown in the study, consisting of 7 seborrheic keratoses (SK), 3 basal cell carcinomas, 2 atypical nevi, 5 malignant melanomas (MM), 3 dermatofibromas, 3 blue nevi, and 2 hemangiomas. Two images of each lesion (one NPD and one PD) were included. The McNemar test and paired t-test were used for the statistical analysis. RESULTS: Ninety-one participants completed the study. Significant differences in the diagnoses were observed for the SK, atypical nevus, and MM images. Seventy-five percent and 59% of the final participants correctly diagnosed SK when presented with the NPD and PD images, respectively. For MM, 23 and 34% made the correct diagnoses with the NPD and PD images, respectively. CONCLUSIONS: Viewing lesions with NPD versus PD can affect the diagnosis and diagnostic confidence of physicians that are novices with dermoscopy. Further studies including physicians at different expertise levels and a larger sample of lesions are needed to further explore the differences.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Dermatology Clinic
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:October 2008
Deposited On:26 Feb 2009 13:23
Last Modified:05 Apr 2016 13:01
Publisher:Wiley-Blackwell
ISSN:1076-0512
Additional Information:The attached file is a preprint (accepted version) of an article published in [Dermatologic Surgery, 2008; 34(10):1389-1395].
Publisher DOI:https://doi.org/10.1111/j.1524-4725.2008.34293.x
PubMed ID:18637816

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