Acquired hypothyroidism in a very young infant with Omenn’s syndrome

Abstract A very young male infant with Omenn’s syndrome had acquired hypothyroidism that was most likely caused by autoimmune thyroiditis. The hypothyroidism appeared at 3 months of age. These 2 rare conditions have not previously been reported occurring together. This case suggests that autoimmune thyroiditis may be another abnormal finding in Omenn’s syndrome. (J Pediatr 2000;136:111-3)