Spontaneous Regression of Congenital Cutaneous Histiocytosis X: Report of a Case with Discussion of Nosology and Pathogenesis

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Abstract
Spontaneous regression of histiocytosis X is a rare biologic event as judged by the extensive recorded experience in the literature. We present a case of congenital cutaneous histiocytosis X that resolved without specific therapy in the first week of life. Histologic and ultrastructural studies confirmed the interpretation. This child is an example of so-called pure cutaneous histiocytosis, which, like the other unisystem forms of the disorders, has an excellent prognosis.