A case of unicentric Castleman’s disease located in the mediastinum is presented. A 20 years old male suffering from cough had an image of right hilar enlargement on chest X-ray. Thorax CT revealed multiple enlarged lymph nodes both in right paratracheal and hilar region. Radionuclide accumulation was detected by 67Ga scintigraphy. Surgical removal of lymph nodes at paratracheal region was performed by mediastinoscopic excision and reported as reactive hyperplasia. Lymph nodes located in right hilum was excised by thoracotomy and histopathologic examination confirmed Castleman’s disease. Our thought about this case was a dominant infiltrative mass with an associated lymphadenopathy. 67Ga scintigraphy imaging that we performed in our case can be a useful method in detection of Castleman’s disease.