1998 Volume 12 Issue 5 Pages 602-606
A 23-year-old female had been pointed out a mediastinal abnormal shadow on chest X-ray film during antithyroid medication for Basedow's disease. She was referred to our hospital for recurrence of hyperthyroidism and increased size of the mediastinal shadow. Chest CT and MRI showed a diffusely enlarged thymus, which was suggestive of thymic hyperplasia. Median sternotomy and total thymectomy were performed on August 6, 1997. The thymus weighed 85 g, and the right lobe was 12.5×5.0 cm in size, and the left lobe 13.5×6.3 cm. Histological examination revealed lymphoid hyperplasia. Her postoperative course was uneventful, and she has been taking medicine for Basedow's disease.
