Dermoscopy of chondrodermatitis nodularis helicis

Area of Science:

• Dermatology
• Oncology
• Medical Imaging

Background:

• Chondrodermatitis nodularis helicis (CNH) is a benign ear condition requiring differentiation from nonpigmented tumors.
• Clinical features of CNH are known, but dermoscopic characteristics for distinguishing it from skin cancers are lacking.

Purpose of the Study:

• To describe the dermoscopic appearance of CNH.
• To develop a differential diagnostic model for CNH using dermoscopy.
• To assess dermoscopy's utility in differentiating CNH from non-melanoma skin cancers.

Main Methods:

• Retrospective, single-center, observational dermoscopic study.
• Involved 189 biopsy-proven lesions: 25 CNH, 26 squamous cell carcinomas, 62 basal cell carcinomas, and 76 other tumors.
• Logistic regression analysis was used for univariate and multivariate assessments.

Main Results:

• A distinctive global dermoscopic pattern, termed 'daisy pattern,' was identified in CNH.
• This pattern features thick, radially arranged white lines converging to a central yellow/brown clod (erosion/crust).
• The 'daisy pattern' demonstrated high specificity (92% for SCC, 98% for BCC) in differentiating CNH.

Conclusions:

• Dermoscopy is a valuable first-line screening tool for diagnosing CNH.
• The consistent 'daisy pattern' aids significantly in differentiating CNH from common skin cancers.
• This dermoscopic finding improves diagnostic accuracy for auricular lesions.