Abstract
In 1979, Takai and Miyauchi reported that piriform sinus fistula is a common route of infection in acute suppurative thyroiditis (AST). We describe a 40-year-old patient who had four recurrent episodes of abscess of the left anterior area of the neck without symptoms of AST. We diagnosed left piriform sinus fistula by barium hypopharyngography.The fistula was completely removed under general anesthesia. At surgery, a fistula could be traced from the left upper lobe of the thyroid to the Piriform sinus between the thyroid and cricoid cartilages. In cases of repeated cervical abscess due to unknown causes, we should consider infection via piriform sinus fistula without episodes of AST.
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