[Acute renal failure in the course of Hashimoto's thyroiditis].

Hashimoto's thyroiditis is the commonest form of autoimmune thyroiditis in the world. It occurs most frequently in women (female/male ratio, 6:1) in the age group between 30 and 60 years. Here we report the case of a 38-year-old Caucasian man who presented with a few days' history of upper limb paresthesias, widespread joint and muscle pain, and headaches. Laboratory findings showed increased CPK, myoglobin and plasma creatinine levels with acute renal failure. Low free T3 and T4 values associated with a high TSH value, the presence of antithyroid globulin and peroxidase autoantibodies pointed to a diagnosis of hypothyroidism with Hashimoto's thyroiditis. Treatment with levothyroxine was initiated and within 2 months normalization of renal function, myoglobin, CPK and thyroid hormone levels was observed.