<prompt> A 40 years old female presents with fever, fatigue, diffuse painful swelling in the midline of the neck. FNAC revealed epitheloid cells giant cells. What is the most likely diagnosis?Acute thyroiditisSubacute thyroiditisTubercular lymphadenitisHashimotos thyroiditis  <response>: Subacute Thyroiditis Aka DE QUERVAINS thyroiditis Aka Viral thyroiditis Aka Granulomatous thyroiditis Aka Giant cell thyroiditis Characterized byUpper respiratory tract infection caused by virus leading to Granulomatous inflammation leading toFollicular destruction giant cell formation Associated with HLA B-35 NSAIDS to control inflammation 