Purpose: To report a rare case of congenital histiocytosis in a newborn without skin involvement.
Design: Interventional case-report.
Methods: A full-term baby presented with a mass over the palpebral conjunctiva of his left upper lid. Ophthalmic examination was otherwise normal, and the baby was healthy. There were no skin lesions.
Results: The lesion was completely removed surgically. Pathologic examination demonstrated a cellular infiltrate composed of eosinophils and histiocytes. Immunohistochemistry disclosed positive stain for protein S-100 and CD1 antigenic determinant. Pediatric oncology evaluation was completely normal. Eighteen months after presentation, the patient remained healthy without recurrence of the lesion.
Conclusions: Rare cases of congenital histiocytosis can present as a solitary lesion over the palpebral conjunctiva, without skin or systemic involvement.
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