Cysts of foregut origin are most commonly found in the ileum, and they are usually lined with respiratory or/and gastrointestinal epithelium. We report a case of lingual foregut cyst lined by both of these epithelium.
The patient was a 3-year-old boy. In July 2016, he was referred to our hospital because of tongue swelling. MRI showed an internal homogeneous and well-circumscribed high signal mass on T2-weighted images. He was followed up under the clinical diagnosis of thyroglossal duct cyst. However, in October 2019, its mass increased, so it was excised under general anesthesia. Histology revealed the cystic lesion was lined by epithelium comprised of pseudostratified columnar ciliated cells and ectopic gastric mucosa including the gastric glands. There was no cord lesion like a tongue canal in the operation findings, no ectopic thyroid gland in the histological findings, and there were no past reports of thyroglossal duct cysts containing both respiratory and gastric epithelium, therefore the final diagnosis in our case was lingual foregut cyst, rather than thyroglossal duct cyst. No recurrence has been observed in the 12 months following the operation.
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