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Original Investigation
May 2016

Association of Shiny White Blotches and Strands With Nonpigmented Basal Cell CarcinomaEvaluation of an Additional Dermoscopic Diagnostic Criterion

Author Affiliations
  • 1Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, Hauppauge, New York
  • 2Department of Dermatology, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
  • 3currently a medical student, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
  • 4Skin and Cancer Associates, Plantation, Florida
JAMA Dermatol. 2016;152(5):546-552. doi:10.1001/jamadermatol.2015.5731
Abstract

Importance  Basal cell carcinoma (BCC) is the most common type of skin cancer and is usually nonpigmented. Shiny white structures (SWSs) are frequently present in BCC.

Objective  To determine the diagnostic accuracy of various morphologies of SWSs for diagnosis of nonpigmented BCC.

Design, Setting, and Participants  Nonpigmented skin tumors, determined clinically and dermoscopically, were identified from a database of lesions consecutively biopsied over a 3-year period (January 2, 2009, to December 31, 2012) from a single dermatology practice. Data analysis was conducted from October 9, 2014, to November 15, 2015. Investigators blinded to histopathologic diagnosis evaluated the polarized dermoscopic images for the presence of SWSs, which were categorized as blotches, strands, short white lines, and rosettes. Measures of diagnostic accuracy for BCC were estimated. Participants included 2375 patients from a dermatologic clinic in Plantation, Florida. Review of the medical records identified 2891 biopsied skin lesions; 457 of these were nonpigmented neoplasms.

Main Outcomes and Measures  Diagnosis of BCC with dermoscopy compared with all other diagnoses combined was the primary outcome; the secondary outcome was diagnosis of BCC compared with amelanotic melanoma. We calculated diagnostic accuracy measured as odds ratios (ORs), sensitivity, and specificity of shiny white blotches and/or strands for the diagnosis of BCC.

Results  Of the 457 nonpigmented neoplasms evaluated, 287 (62.8%) were BCCs, 106 (23.2%) were squamous cell carcinoma, 39 (8.5%) were lichen planus–like keratosis, 21 (4.6%) were melanomas, and 4 (0.9%) were nevi. The prevalence of SWSs was 49.0% (n = 224). In multivariate analysis (reported as OR [95% CI]) controlling for age, sex, and anatomical location, the presence of any SWS was associated with a diagnosis of BCC (2.3 [1.5-3.6]; P < .001). Blotches (6.3 [3.6-10.9]; P < .001), strands (4.9 [2.9-8.4]; P < .001), and blotches and strands together (6.1 [3.3-11.3]; P < .001) were positively associated with BCC. Shiny white blotches and strands together had a diagnostic sensitivity of 30% and specificity of 91%.

Conclusions and Relevance  The combined presence of shiny white blotches and strands is associated with high diagnostic specificity for nonpigmented BCC.

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