Abstract
A 35-year-old man was admitted to our hospital with an abnormal shadow on chest radiograph at an annual medical check-up. Chest CT showed a mass at his left hilum in which 18F-fluorodeoxyglucose (FDG) accumulated, with a maximum standardized uptake value of 2.63. An open biopsy of the mass was conducted through a thoracotomy, and frozen sectioning showed lymphoid infiltrations without malignancy. Then, the tumor itself was excised from the surrounding lung parenchyma. The final pathological diagnosis was Castleman's disease, hyaline vascular type. Because a differential diagnosis of Castleman's disease of hilar lymph node origin is often difficult, even employing modern imaging modalities, it is important to be aware of Castleman's disease on the differential diagnosis of a hilar tumor.
