Review Question - QID 7470

A 20-year-old woman reports mild fullness and occasional aching over the left hip; the symptoms are worse with activities and better with rest. She denies trauma to the area. She states the fullness has been present as long as she can remember. Examination reveals a deep fullness anterior to the hip joint, and mild tenderness at the extreme of hip flexion. Figure 82a through 82c show an AP radiograph, a CT scan, and a T2-weighted MRI scan. Based on these imaging studies, what is the most likely diagnosis?