Fig. 1From: Hip arthroscopy has good clinical outcomes in the treatment of osteoid osteoma of the acetabulumPreoperative and postoperative CT and MRI of one patient diagnosed with OO of the acetabulum in zone 4. A-D. Preoperative axial CT, coronal CT, axial MRI and coronal MRI showed the location of OO. E-H. Postoperative axial CT, coronal CT, axial MRI and coronal MRI showed the excision of OOBack to article page