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Erdheim–Chester disease (ECD), a type of systemic non‐Langerhans cell histiocytosis, is uncommon and characterized by the accumulation of CD68+CD1a− foamy histiocytes. It is extremely rare in children. The skin lesions of paediatric ECD have not been systemically described before. We report a case of ECD in a 3·5‐year‐old Chinese boy. The patient presented with generalized skin and bone involvement...
Tumoral melanosis describes a pigmented lesion clinically similar to melanoma but on histology reveals dense aggregates of melanin‐laden, benign macrophages without malignant cells. In the few reported cases so far, tumoral melanosis has arisen in the skin or lymph node of a patient with a regressed melanoma or an epithelioid tumour. As a marker of regressed primary melanoma, its discovery may prompt...
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