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Langerhans cell histiocytosis (LCH) is a rare idiopathic benign disease characterized by proliferation of Langerhans cells, most commonly in the skull. In extremely rare cases, the tumor can occur in the sternum. A 4-year-old girl presented to our institution with a firm, nontender mass in her anterior chest that had indolently enlarged to approximately 2 cm in diameter over the previous several months...
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