This article presents a girl, aged 9 years and 6 months, with palatal arch constriction resulting in bilateral posterior crossbite and midline deviation.

• 本文提出的临床病历报告为一名九岁半的女童，她于上颚因骨骼性狭窄而造成有双侧性后牙错咬的现象，并伴随功能性下颚咬合偏移中线的症状。