Mastocytosis is a heterogeneous group of disorders with a variable clinical course, ranging from indolent disease with normal life expectancy to highly aggressive disease. In the skin, mast cells may show a spindle-shape appearance or appear as round cells with wide, polygonal cytoplasm. In this study, we present a case series of 4 patients with cutaneous childhood-onset mastocytosis in whom skin mast cells showed striking nuclear pleomorphism with bilobed and multilobed nuclei. Such finding does not seem to represent a malignant phenotype of the disease in the skin, although the true biological significance and the potential prognostic impact remain to be determined.
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