A case with isolated ACTH deficiency accompanying chronic thyroiditis.

An unusual case of isolated ACTH deficiency with coexisting chronic thyroiditis in a 53-year-old man is reported. The patient was admitted with a 2-year history of generalized fatigue, a 13-kg weight loss, muscular weakness, and frequent hypotensive and hypoglycemic attacks. On admission serum thyroxine and triiodothyronine were significantly elevated. Basal TSH concentration was not detected and TSH showed no response to TRH, but one month after replacement therapy with hydrocortisone it was shown that serum T3, T4 and TSH response were all within normal limits. Thyroid antibodies were positive and biopsy of the thyroid gland showed chronic thyroiditis. Arginine and 1-Dopa provoked a subnormal rise in GH with a maximum of 5.6 ng/ml and 5.0, respectively. One month after treatment with hydrocortisone, GH response to 1-Dopa and arginine increased to the normal range. Prolactin response to TRH was normal and FSH response to LHRH was also normal. LH showed an exaggerated response to LHRH, although a normal response was revealed after treatment with hydrocortisone. We also presented a summary of 44 Japanese cases, 23 males (mean age; 46 yrs old) and 21 females (mean age; 48 yrs old), with isolated ACTH deficiency.