<prompt> A 28 year old male presents with ophthalmoplegic signs of thyrotoxicosis. All of the following can be considered in the differential diagnosis of the case, EXCEPT:Diffuse thyroid goitreHashimotos ThyroiditisRiedels ThyroiditisAdenomatous goitre  <response>: Riedels Thyroiditis is the rarest type of thyroiditis characterized by replacement of all or pa of the thyroid parenchyma by fibrous tissue, which also invades into adjacent tissue. As the thyroid tissue is replaced by fibrous tissue it may present with hypothyroidism but never with hypehyroidism. Riedels Thyroiditis is one condition where hypehyroidism is not seen, not even transiently. Ref: Schwaz 9e, Page 1357; Harrison 17e, Page 2239; CMDT, 2005, Page 1111. 