RT Journal Article SR Electronic T1 Gigantic enlargement of the thymus gland. JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1587 OP 1589 VO 28 IS 10 A1 Regal, Mohamed A. YR 2007 UL http://smj.org.sa/content/28/10/1587.abstract AB True massive thymic hyperplasia is a very rare entity, characterized by an increase in the size and weight of the thymus gland, without an apparent cause. Surgery has been required in patients with severe respiratory distress. We present an idiopathic true massive thymic hyperplasia in a 5-month-old boy.