<prompt> Riedels thyroiditis is associated with:HypehyroidismRetroperitoneal fibrosisHyperparathyroidismNon-palpable thyroid gland  <response>: Riedels Thyroiditis Aka Invasive Fibrous thyroiditis Characterized by complete replacement of thyroid and parathyroid glands by fibrous tissue. Associated with Retro orbital fibrosis Periorbital fibrosis Retroperitoneal fibrosis Sclerosing cholangitis Management Lifelong levothyroxine due to permanent hypothyroidism Lifelong calcium and Vitamin D supplementation due to permanent hypoparathyroidism 