Pituitary hyperplasia secondary to acquired hypothyroidism: case report

Table 1 Hormonal pattern at diagnosis and during follow up

Parameter	Before therapy	3 months later	6 months later	Normal range
TSH, mU/L	589	13.8	4.3	0.20-4.50
Free T4, pmol/L	1.5	13.9	14.2	12-22
Free T3, pmol/L	2.2	6.2	5.4	3.8-8.6
IGF-I, nmol/L	8.6	24.66	n.a.	11.64-34.1
PRL, nmol/L	1.23	0.51	n.a.	0.17-0.64

TSH: thyroid-stimulating hormone; T4: thyroxine; T3: triiodothyronine; IGF-I: insulin-like growth factor I; PRL: prolactin. Results are expressed in international unit. For free T4 to convert to ng/dL divide by 12.86; for free T3 to convert to ng/dL divide by 1.536, for IGF-I to convert to ng/mL divide by 0.1307, for PRL to convert to ng/mL divide by 0.0426. N.a.: not available

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