Castleman disease is a rare disorder of the lymphoid system characterized by noncancerous growths that may develop in lymph node tissues throughout the body. Most often this occurs in the neck, mediastinum, and abdomen where lymph nodes aggregate. Here we describe a case of asymptomatic intrapulmonary Castleman disease adjacent to the left pulmonary hilum that mimicked central pulmonary malignancy in a 27-year-old man who underwent curative surgical removal of the mass.