We present this case to remind clinicians that if low back pain, especially combined with lower limb weakness are present in patients, psoas abscess should be considered even if no fever.

• 本文目的主要是提醒医师在台湾对于下背痛的病人，尤其合并有下肢无力的情形时，即便没有发烧，腰肌脓疡应该列入考虑。