蝦蟇腫樣の像を呈せる先天性腮弓性嚢腫の1例

　緒言

　口腔底嚢腫の中，最もしばしば見られるものは，蝦蟇腫であるが，その発生機轉に関しては，多くの学者は，舌下腺，或はその排泄管の貯溜嚢腫と考えて居る現状である．然しながら，他の発生機轉を主張する者もあり，殊に，Neumann（1877）は，内面に氈毛上皮を有する例を見，先天性畸型で，腮弓裂の癒着しない場合に起るものと考えて居り，Tampson，Hanley等も，この説に賛したのであるが．其の後，かかる報告が甚だ稀である爲に，この説は薄弱なものとされるに至つて居る．

　然るに，私達は，今囘，一見蝦蟇腫を思わせる口腔底嚢腫で，種々な点より考察して，腮弓性発生と断定し得た一例を経驗した．文献を探ぐるに，本邦では未だかかる報告を見ないので，ここに報告し，諸家の批判を乞うものである．

　Niho says clinical recognition that ranula may be caused by branchiogenetic origin, as advocated by Neumann, is important. Bilateral ranular cysts were found in a male patient, 22 years of age, who later was completely relieved of the condition by operation. Reasons to believe these cysts originated from branchial anlage and were not simple ranula are based on the following facts. Generally rauulae are found as unilateral affection whereas it was bilateral in this case. The posterior end of the cysts reached the palatine arch ; the positon and extent of which coincided with that of the branchial anlage. Histologically they lined with columnar epithelium which were interspersed with ciliateed ones in places.