Fig. 3From: Multicentric, multifocal, and recurrent osteoid osteoma of the hip: first case reportAfter 18 months, hip pain re-appeared, thus the patient underwent MRI (a, b) and CT (c) showing a recurrence of the previously treated OO of the posterior aspect of the acetabulum (void arrows), with extensive adjacent bone marrow oedema (arrowheads) well demonstrated on coronal fat-saturated proton density-weighted (a) and axial T2-weighted (b) imagesBack to article page