Fig. 2

Lumber intradural mass lesions. A Intradural abscess (female patient 5 years old, laminoplasty); a preoperative T1MRI without and with contrast, b follow-up T1MRI with contrast 6 months after surgery, c intraoperative photo; arrow 1 points to the pus and d intraoperative photo shows the cavity of the abscess. e sagittal and axial intraoperative ultrasound images; arrow 2 the spinal cord and 3 the abscess cavity. B Intradural epidermoid cyst (male patient 16 years old, laminoplasty); a preoperative T2MRI, T1MRI with contrast, b early postoperative T1MRI, c intraoperative photo; arrows 1 points to open-door laminoplasty and e sagittal and axial ultrasound images; arrow 2; the spinal cord, arrows 3; epidermoid cyst and arrow 4 cerebrospinal fluid