Ranula (English spelling)

Japanese: がま腫 - がましゅ(英語表記)Ranula
Ranula (English spelling)
[What kind of disease is it?]
The area inside the lower jaw that is covered by the underside of the tongue and corresponds to the bottom of the mouth is called the floor of the mouth, and on both sides of the floor of the mouth are the sublingual glands. A callus is usually a relatively soft, thin-walled, painless swelling that occurs on either the left or right side of this area.
The surface is covered with smooth, normal mucous membrane, and the interior is transparent and appears bluish.
When the swelling becomes severe, it looks like the pouch in the throat of a toad, hence the name toad swollen throat.
When the salivary ducts of the sublingual glands located on both sides of the front of the floor of the mouth become blocked, saliva accumulates and a cyst (a sac-like mass) forms.
Traditionally, treatment involved surgery to remove the contents and then prevent the duct from closing again, but it is now thought that removing the sublingual gland will lead to a permanent cure.

Source: Shogakukan Home Medical Library Information

Japanese:
[どんな病気か]
 舌の裏面におおわれた下あごの内側の部分で、口の中の底にあたる部位を口腔底(こうくうてい)といい、口腔底の両側には、舌下腺(ぜっかせん)があります。がま腫は通常、この部位の左右どちらかにできる、比較的やわらかく、壁の薄い袋状の、痛みのない腫(は)れです。
 表面はなめらかな正常の粘膜(ねんまく)におおわれていて、内部が透きとおり、青みを帯びて見えるのが特徴です。
 大きく腫れると、その部分ががま蛙(がえる)ののどにある袋のように見えることから、がま腫という病名がつきました。
 口腔底の前両側にある舌下腺の唾液(だえき)(つば)が出る管がつまったりして、唾液がたまるため、嚢胞(のうほう)(袋のような腫瘤(しゅりゅう))ができるのです。
 治療としては、従来、内容を取り除いた後、管が再び閉じないようにする手術が行なわれていましたが、現在は舌下腺を摘出することが根治につながると考えられています。

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