骨形成を伴った上顎洞内異所性埋伏智歯の1例

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  • A case of an ectopic third molar in the maxillary sinus associated with bone formation
  • ホネ ケイセイ オ トモナッタ ジョウガクドウ ナイイショセイ マイフク チシ ノ 1レイ

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We report a case of an ectopic third molar in the left maxillary sinus associated with surrounding bone formation. A 31-year-old woman visited our hospital because of headache and discomfort in the left buccal region. Imaging findings revealed an impacted tooth in the left maxillary sinus and radiographic opacity with bone formation around the tooth. The lesion was clinically diagnosed as a benign tumor in the left maxillary sinus, and surgery was performed with the patient under general anesthesia. Examination of the resected specimens revealed a third molar surrounded by globules of pale yellow fatty marrow in thin sheets of bone. Histopathologically, the lesion was diagnosed as a third molar erupting ectopically in the maxillary sinus. During growth and development, bone including the germ of the third molar mostly likely became detached from the bone around the maxillary sinus, and this fragment was displaced to the maxillary sinus, where additional bone was formed. In our experience, such a case is extremely rare. Our findings also suggested that an isolated bone fragment in the maxillary sinus probably caused the lesion.

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