BACKGROUND: Acute suppurative thyroiditis (AST) is very rare.Pyriform sinus fistula (PSF) is implied as a cause of AST.是什么意思_BACKGROUND: Acute suppurative thyroiditis (AST) is very rare.Pyriform sinus fistula (PSF) is implied as a cause of AST.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句