Castleman's disease, giant lymph node hyperplasia, is a rare benign tumor which was originally reported by Castleman in 1956. It has two types of pathological characteristics of hyaline-vascular and plasma cell. Surgery is usually perferred because of the giant mass shadow on the chest roentgenogram rather than symptomes it causes. It is cured completely by resection without recurrence. We have experienced a case of Castleman's disease in the right anterosuperior mediastinum in a 36-year-old female. She was treated by surgical resection with good result She is well one year after surgeny.

Spontaneous pneumomediastinum is an uncommon disease that is defined as the presence of free air in the mediastinum in the absence of any obvious precipitating cause. This condition occurs as a rare complication of acute exacerbation of asthma. Classic symptoms include retrosternal chest pain, dyspnea and cough, but are not specific. Spontaneous pneumomediastinum complicated by asthma is usually self-limiting and well controlled with conservative management, but this condition can be potentially life threatening. We report a case of 18-year-old woman with asthma who presented with spontaneous pneumomediastinum. The patient was treated conservatively with oxygen and steroid therapy, and her clinical conditions were improved. Spontaneous pneumomediastinum disappeared.