OBJECTIVES:
Primary
* Determine the range of optimal timing for magnetic resonance imaging of lymph nodes after administration of ferumoxytol, in terms of assessing signal intensity using pre-defined pulse sequences in regions of interest and visual criteria, in patients with primary prostate or breast cancer who are scheduled to undergo surgical lymph node dissection or sampling.
Secondary
* Correlate MRI signal intensity with histological findings in patients undergoing this procedure.
OUTLINE: This is an open-label, pilot study.
Patients undergo a baseline MRI. Within 24 hours after the baseline MRI, patients receive ferumoxytol IV over 10-15 seconds (or over 1 hour). Patients then undergo MRI immediately after ferumoxytol administration (at the discretion of the principal investigator) and then at 24-28 hours.
Patients are followed at 2 weeks.
PROJECTED ACCRUAL: A total of 10-14 patients (6-8 with prostate cancer and 4-6 with breast cancer) will be accrued for this study.
