先天性梨状かろうの１例

Abstract

A case of pyriform sinus fistula of congenital origin was observed. The patient was a 36-year-old man who developed suppurative thyroiditis of the upper left lobe of the thyroid in 1985 and again in October 1988. He first visited our department on October 11, 1988. Two weeks later, on the basis of a barium esophagogram, a diagnosis of pyriform sinus fistula was made. In December, a total fistulectomy was performed. During the operation, the fistula was stained through the opening of the fistula canal under microlaryngoscopy. The fistula originated from the pyriform sinus membrane situated postern-superiorly to the inferior corn of the thyroid cartilage and descended to the superior pole of the thyroid through the caudal side of cricopharyngeal part of the musculus constrictor pharynges inferior. The lumen of the fistula canal was histologically lined with stratified squamous epithelium. The localization and the left-sidedness of the fistula canal suggested that it originated from the 4th branchial pouch.