MRI - MARS (metal artifact reduction sequence)
Axial T2
T1 axial
T1 coronal
STIR sagittal
An attempt was made to obtain post-contrast images, however, the patient was extremely claustrophobic and as a result these images were not obtained.
There is marked, lobular mass-like thickening of the synovium of the right hip. Corresponding to the ultrasonographic findings, this extends over approximately 11 cm in the craniocaudal direction and approximately 7 cm in transverse diameter. The synovium measures up to 1.8 cm in thickness. It is predominantly of intermediate signal intensity on T1 and T2-weighted imaging, while its inner margin is of extremely low signal on all of the sequences. A small amount of fluid remains in the synovial cavity.
There is also a 1.8 x 1.2 cm fluid collection lateral to the hip, at the level of the acetabulum, as demonstrated on ultrasound. There is complete fatty atrophy of the adductor muscles. The known right superior pubic ramus fracture is obscured by artifact from the cobalt acetabular component of the prosthesis.
Incidental note is made of the presence of moderate sigmoid diverticulosis and of bilateral S2 Tarlov cysts.