68Ga-PSMA-11 PET/MRI in Finding Tumors in Patients With Intermediate or High-Risk Prostate Cancer Undergoing Surgery

INCLUSION CRITERIA * Biopsy-proven prostate adenocarcinoma * Planned prostatectomy with lymph node dissection * Intermediate- to high-risk disease (as determined by elevated prostate-specific antigen (PSA) \[PSA \> 10\], T stage \[T2b or greater\], Gleason score \[Gleason score \> 6\] or other risk factors) * Karnofsky performance status of ≥ 50 \[or Eastern Cooperative Oncology Group (ECOG)/World Health Organization (WHO) equivalent\] * Diagnostic CT or MRI performed within 90 days of the research PET * Able to provide written consent ExCLUSION CRITERIA * Patients not capable of getting PET study due to weight, claustrophobia, or inability to lay still for the duration of the exam * Neoadjuvant chemotherapy or radiation therapy prior to prostatectomy, including focal ablation techniques (HiFu) * Androgen deprivation therapy or other neoadjuvant treatments prior to PET imaging and surgery * Metallic implants (contraindicated for MRI)