Hypothyroidism in primary hyperoxaluria type 1

We describe 4 patients, aged 3 months to 23 years, with end-stage renal dis ease and severe, symptomatic hypothyroidism. All 4 had primary hyperoxaluri a type 1 (PH1) with diffuse tissue (kidneys, skeleton, eyes, heart) calcium -oxalate deposition, a condition known as oxalosis. The hypothyroidism resp onded to thyroid hormone replacement therapy. Clinical hypothyrodism within the framework of PH1/oxalosis was probably caused by thyroid tissue damage from an abundance of calcium oxalate. Were recommend that thyroid function be monitored In patients with PH1 and oxalosis.