Response of liver metastases after treatment with yttrium-90 microspheres: role of size, necrosis, and PET.

Objective: Yttrium-90 radioembolization is an emerging treatment for liver malignancies. The purpose of this study was to evaluate the imaging response of liver metastases to 90Y microspheres based on size and necrosis criteria using CT and comparing the results to PET and to describe imaging features related to 90Y therapy.

Materials And Methods: We reviewed the imaging studies of 42 patients with unresectable liver metastases treated with lobar radioembolization with 90Y.

Imaging of hepatocellular carcinoma after treatment with yttrium-90 microspheres.

Objective: Yttrium-90 radioembolization is an emerging therapy for unresectable hepatocellular carcinoma (HCC). Although therapeutic response based on size has been evaluated in numerous studies, necrosis has been used as a criterion of response in only a few studies. The purpose of our study was to describe the imaging features of HCC after 90Y treatment and to compare size criteria (World Health Organization [WHO] and Response Evaluation Criteria in Solid Tumors [RECIST]) with necrosis criteria and combined criteria (RECIST and necrosis) for assessment of response.

CT diagnosis of chyluria after partial nephrectomy.

Objective: The purpose of this study was to describe the CT diagnosis of chyluria after partial nephrectomy.

Conclusion: Fat in the bladder can be identified on CT after partial nephrectomy. This finding is caused by chyluria secondary to lymphatic injury and should not be mistaken for other abnormalities.

MRI of islet cell tumors of the pancreas.

Objective: CT is the most widely used imaging technique for the diagnosis of islet cell tumors, but MRI may be better for detecting small lesions and metastases because of its optimal contrast resolution and ability to easily perform dynamic imaging. The purpose of this pictorial essay is to highlight the MRI features of these tumors and underscore potential pitfalls.

Conclusion: Although classically considered well-defined, arterially enhancing lesions that are bright on T2-weighted sequences, pancreatic islet cell tumors have quite a broad spectrum of appearances.

MRI of adenocarcinoma of the pancreas.

Objective: CT is the established imaging technique for evaluation of pancreatic adenocarcinoma. MRI, however, can play a major role in this disease. The objective of this study is to illustrate the strengths of MRI for evaluating pancreatic adenocarcinoma.

Magnetic resonance imaging of the pancreas: the future is now.

MR imaging has made significant advances in recent years, with an increasingly important role in the detection, characterization, and staging of pancreatic diseases. MRI is appealing as a noninvasive imaging modality as it can evaluate the pancreas, the vasculature, and the pancreaticobiliary ducts in a single examination. Advantages of MRI include its excellent soft tissue contrast resolution and anatomic detail and absence of ionizing radiation.