Anatomic pathology selected abstracts
October 2025—Crystal-storing histiocytosis is a rare disorder in which crystals accumulate in the cytoplasm of histiocytes. It is usually associated with a lymphoplasmacytic neoplasm. Cutaneous crystal-storing histiocytosis (CSH) is extraordinarily rare and limited to case reports in the literature. The authors reported on two cases of CSH with cutaneous involvement. Case one was a 65-year-old male with a four-month history of a pruritic eruption that started as a solitary pink to skin-colored indurated plaque on the anterior neck before progressing to involve the whole neck, chest wall, and face.