Rectal Cancer: Mesorectal Lymph Nodes at MR Imaging with USPIO versus Histopathologic Findings—Initial Observations

Mesorectal lymph nodes can be characterized by using USPIO and T2*-weighted MR imaging. Uniform and central low-signal-intensity patterns are features of nonmalignant nodes. Reactive nodes frequently show central low signal intensity at T2*-weighted imaging.