ガマ腫様の口底部腫脹を呈した顎下腺管閉鎖症の1例

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  • A case of atresia of the submandibular duct resulting in cystic swelling of the oral floor resembling a ranula
  • ガマ シュ サマ ノ クチ テイブ シュチョウ オ テイシタ ガク カセンカン ヘイサショウ ノ 1レイ

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Atresia of the submandibular duct is a rare condition associated with congenitally imperforate duct orifices. Cystic swelling of the oral floor caused by mucous-filled dilation of the submandibular duct is sometimes similar to ranula. We present a case of atresia of the submandibular duct that we diagnosed as congenital ranula at initial presentation. A 5-month-old female infant was referred to our hospital because of a swelling under the tongue, first noted at birth. Intraoral examination showed a translucent, fluctuant cystic mass, 15 mm in diameter, arising in the left side of the mouth floor. In addition, no flow of saliva could be detected. Magnetic resonance imaging revealed a serpentine tube-form structure extending from the oral floor to the submandibular gland, which corresponded to the trajectory of Wharton’s duct. Marsupialization with sialodochoplasty was performed with the patient under general anesthesia. Histological examination showed that the roof of the cystic lesion was lined with ductal epithelium. The postoperative course has been uneventful, with no evidence of recurrence.

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