Inclusion Criteria:  One of the following:  Patients with suspected recurrence based on elevated serum prostate specific antigen (PSA) level. Patients with suspected metastasis who are candidates for initial definitive therapy. Patients must be able to lie still for approximately 20 - 40 minutes for the PET/CT scans. Patients must be deemed medically stable by their treating physician. Patients must have the ability and willingness to sign a written informed consent.  Exclusion Criteria:  Patients must not weigh more than the maximum weight limit for the PET/CT scanner table (> 225 kilograms or 500 pounds). Patients must not have history of allergic reactions attributed to compounds of similar chemical or biologic composition to 68Ga PSMA-11. Patients must not be claustrophobic.