The MEF2C-SS18-positive cases arose in the oral cavity (4/5) and parotid gland (1/5) of 3 women and 2 men ranging from 21 to 80 years (mean: 46) and shared near-identical histologic features: intercalated duct-like cells with eosinophilic to clear cytoplasm and small, uniform oval nuclei, infiltrative microcysts and cords, abundant intraluminal secretions, and cellular fibromyxoid stroma.