Computed tomography and magnetic resonance imaging of iliopsoas bursitis

(A) Soft tissue window computed tomography (CT), axial pelvis. Note the cystic, low attenuation mass immediately anterior to the right femoral head (arrow).
(B) Proton density-weighted magnetic resonance imaging (MRI), axial pelvis. The area of decreased attenuation on the CT study displays homogeneous low signal intensity on MRI (arrow).
(C) T2-weighted MRI, axial pelvis. Observe the homogeneous hyperintense signal intensity in this localized fluid collection (arrow). These findings are consistent with iliopsoas bursitis.