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OBJECTIVE: To describe the dermoscopic features, including vascular structures and patterns associated with dermatofibromas in a large series of cases. DESIGN: Digital dermoscopic images of the prospectively collected dermatofibromas were evaluated for the presence of multiple structures and patterns. SETTINGS: Dermatofibromas were collected in the Departments of Dermatology of the Hospital de Sant Pau i Santa Tecla, Tarragona, Spain, and Hospital de Sant Llatzer, Palma de Mallorca, Spain. PATIENTS: A total of 412 dermatofibromas (from 292 patients) with complete documentation were collected. MAIN OUTCOME MEASURES: Frequency and intraobserver and interobserver agreement of the dermoscopic structures and patterns in dermatofibromas. RESULTS: A total of 19 morphological dermoscopic structures were evaluated. Pigment network was observed in 71.8% (3% atypical pigment network), white scarlike patch in 57.0%, and a white network in 17.7%. Different vascular structures were observed in 49.5% (dotted vessels in 30.6%). Ten dermoscopic patterns were observed. The most common pattern seen in our series (34.7% of cases) was central white patch and peripheral pigment network, but in 65.3% of the cases, dermatofibromas presented different patterns including simulators of melanoma. CONCLUSION: The most common pattern associated with dermatofibroma is the classic dermoscopic pattern (pigment network and central white patch), but this tumor has a wide range of presentations.
Zaballos et al. (Tue,) studied this question.