66-year-old male with a right acetabular lesion and pain. Follow-up right acetabular lesion. BONE MARROW: Metallic susceptibility artifact from a right femoral intramedullary rod and screw device limits evaluation of the right hip. Note is made of foci of signal void along the superior and posterior aspect of the right hip which are presumably postsurgical in etiology.The reference ill-defined lesion along the superior aspect of the right acetabulum is not definitively visualized on today's examination and may represent postsurgical or posttraumatic bone marrow edema. There is a 17 x 16 x 15 mm (TR x AP x CC) focus of increased signal abnormality on fluid sensitive sequences within the right sacrum which enhances on postcontrast sequences (image 39; series 11), appearing similar to the prior study. There is an additional 8 mm focus of enhancing signal abnormality along the superomedial aspect of this sacral lesion (image 38; series 11).Note is made of heterogeneous bone marrow signal abnormality which is nonspecific but may reflect residual islands of red marrow.SOFT TISSUES: The imaged musculature of the pelvis is normal in appearance.JOINTS: There is a small amount of fluid within the femoroacetabular joints, bilaterally, which is not necessarily of any clinical significance.ADDITIONAL
1. Near complete interval resolution of the previously described lesion within the superior right acetabulum as described above.2. There is a 17 mm enhancing lesion within the right sacrum with an additional adjacent satellite lesion which is nonspecific, however, metastatic disease cannot be excluded, particularly in the setting of a known primary malignancy. Follow-up examination is recommended to evaluate for interval change and establish stability.