上咽頭腫瘍を疑わせた巨大な後鼻孔ポリープ

A Case of Large Antrochoanal Polyp Suspected of Epipharyngeal Tumor

　I．はじめに

　鼻腔のポリープのうち，上顎洞より発生し自然孔より後鼻孔を経て，後方に下垂するものを上顎洞性後鼻孔ポリープ（antrochoanal polyp）と呼ぶ。この後鼻孔ポリープは線維腫，神経線維腫，リンパ管腫，血管腫，軟骨腫，骨腫，脂肪腫，乳頭腫，混合腫，癌腫および肉腫などと鑑別しなければならない。

　今回，我々は上咽頭腫瘍を疑うほど巨大な後鼻孔ポリープの1例を経験したので報告した。

　A 17-year-old girl with no past history of nasal diseases noticed nasal obstruction, rhinorrhea and hyposmia in both sides 2 months prior to admission.

　A small polyp was present in the right middle meatus and a white mass was observed in the right choana. Plain x-ray of the skull showed opacification in both maxillary sinuses. Tomograms and CT scan revealed opacification in the epipharynx which was suspected of epipharyngeal tumor. Removal of a large epipharyngeal mass and Caldwell-Luc operation were performed, and the histopathological examination of the mass showed inflammatory polyp.