Intra-oral signs include raised floor of mouth due to sublingual space involvement and posterior displacement of tongue.
口内体征包括舌下间隙发病引起的口底隆起和舌后移位。
英语百科
Sublingual space
The sublingual space is a fascial space of the head and neck (sometimes also termed fascial spaces or tissue spaces). It is a potential space located below the mouth and above the mylohyoid muscle, and is part of the suprahyoid group of fascial spaces.