Pathologic Diagnosis: Localized Hyaline-Vascular-Type Castleman Disease (Angiofollicular Lymphoid Hyperplasia)
Castleman disease (angiofollicular lymphoid hyperplasia) is a rare disorder that was first described in 1952 as a localized mediastinal lymph node hyperplasia resembling thymoma.[1] Localized Castleman disease of the thorax typically manifests as either a solitary, well-circumscribed mass or as an infiltrative mass with associated lymphadenopathy on CT.