Changes in Brain Metastasis During Radiosurgical Planning.

Purpose: To determine whether there are any changes in brain metastases or resection cavity volumes between planning magnetic resonance imaging (MRI) and radiosurgery (RS) treatment and whether these led to a change in management or alteration in the RS plan.

Methods And Materials: Patients undergoing RS for brain metastasis or tumor resection cavities had a standardized planning MRI (MRI-1) performed and a repeat verification MRI (MRI-2) 24 hours before RS. Any change in management, including replanning based on MRI-2, was recorded.

An unusual case of radioactive seed migration to the vertebral venous plexus and renal artery with nerve root compromise.

Purpose: We report a case of prostate brachytherapy seed migration to the vertebral venous plexus and subsequently to the renal artery with corresponding dosimetry analysis describing nerve doses.

Methods And Materials: A 52-year-old male with low-risk prostate carcinoma (clinical stage T1c; Gleason score=6; prostate-specific antigen level of 5.5) underwent transperineal permanent prostate seed implant.