Agminated blue nevus (ABN) is a melanocytic nevus rarely mentioned in the literature and not well known. The term agminated is used when many blue nevi are clustered together in a sharply demarcated area ≤10 cm. Specific dermatoscopic features have not currently been clearly defined. We describe two cases of ABN and provide a review of the literature, reporting the main points in order to facilitate the diagnosis of this rare entity.
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Diagnostic Imaging of Agminated Blue Lesions and Blue Lesions with Satellitosis: Case Series with a Concise Review of the Current Literature.
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Department of Dermatology, Sapienza University of Rome, 00185 Rome, Italy.
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- Agmination and satellitosis in pigmented blue lesions are poorly understood phenomena that can appear in various skin conditions, including benign and malignant lesions like blue nevi and melanoma.
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Halo nevus is a benign type of melanocytic nevi commonly found in children and manifests as a central pigmented part surrounded by a well-defined hypopigmented area. Halo nevi are commonly located on the trunk. The central nevus may show partial or complete regression, whereas the associated halo may persist or enlarge.
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Blue nevi, usually presenting as solitary, bluish, asymptomatic macules or nodules, are formed by collections of dermal melanocytes that failed to complete their migration from the neural crest to the dermo-epidermal junction. The term "agminated blue nevi" refers to multiple lesions grouped, linear, or arranged in a blashkoid distribution. It is a relatively rare phenomenon with less than 35 cases reported in the literature, but only 14 cases with dermoscopic features.
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