• Ömer Faruk Elmas, Necmettin Akdeniz, Emine Müge Acar, and Asuman Kilitçi.
• Department of Dermatology and Venereology, Faculty of Medicine, Ahi Evran University, Kırşehir, Turkey
• Turk J Med Sci. 2019 Oct 24; 49 (5): 147114781471-1478.

Background/AimPyogenic granuloma (PG)-like nodular Kaposi’s sarcoma (KS) has been previously demonstrated in several studies. However, to the best of our knowledge, no original study investigating the dermoscopic differential diagnosis of PG and KS exists in the relevant literature. In this study we aimed to identify dermoscopic findings providing useful clues to differential diagnosis between the two entities.Materials And MethodsPatients with histopathologically confirmed PG or nodular KS were included in the study. Demographic, clinical, dermoscopic, and histopathological findings of the cases were retrospectively reviewed.ResultsThe most common finding observed in PG was red structureless areas (80.00%), followed by intersecting thick white lines (56.66%), ulceration (36.66%), and collarette scale (33.33%). The most common findings detected in nodular KS were polychromatic structures (56.66%) and red (46.66%) and white (13.33%) structureless areas, respectively.ConclusionIntersecting thick white lines seem to be the strongest dermoscopic clue to PG. Striate surface scaling (n = 6) was a novel finding identified for PG. Here we also described a new vascular pattern (widespread vessels composing a network) for nodular KS.This work is licensed under a Creative Commons Attribution 4.0 International License.

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