Castleman disease of the parotid gland: MR imaging findings with pathologic correlation

A case of a hyaline-vascular type of Castleman disease originating in the parotid gland in which MR-pathologic correlation was obtained was presented. T1- and T2-weighted MR images showed a well-circumscribed 6 cm mass of intermediate signal intensity with hypointense branching structures within the mass. Gadolinium-enhanced dynamic MR imaging demonstrated a marked homogeneous enhancement of the mass with a peak enhancement at 60 s after intravenous gadolinium injection, whereas the branching structures showed a delayed enhancement to the degree of the mass at equilibrium phase. MR-pathologic correlation revealed that the branching structures corresponded to thick fibrotic bundles in the mass. A homogeneously enhancing well-circumscribed parotid mass with hypointense branching structures may indicate Castleman disease.