The purpose of this study is to determine the benefits of Magnetic Resonance Imaging (MRI) combined with Magnetic Resonance Spectroscopic Imaging (MRSI), on an instrument called a 3.0 Tesla (T) MR scanner.

Inclusion Criteria:

• Patient must have clinically suspected or biopsy proven prostate cancer. If a patient has been diagnosed with prostate cancer an official report of biopsy from MSKCC or outside site is required. All outside pathology reports will be confirmed at MSKCC.
• For those patients who have undergone prostate biopsy it is recommended that the interval between biopsy and protocol MRI/MRSI should be at least 8 weeks.
• Patient is a potential surgical candidate for treatment of prostate cancer
• Patient is willing to undergo an endorectal MRI/MRSI exam on the 3.0T MR scanner

Exclusion Criteria:

• Patients who because of general medical or psychiatric condition, or physiologic status unrelated to the presence of prostate cancer cannot give valid informed consent.
• Patients who are unwilling or unable to undergo MRI/MRSI (including patients with contra-indications to MRI such as the presence of cardiac pacemakers or non-compatible intracranial vascular clips.
• Patients who cannot tolerate or have contra-indications to endorectal coil insertion; for example, patients who have had a prior abdominoperineal resection of the rectum or have Crohn's disease, patients with severe hemorrhoids, patients who have had prior radiation to the pelvis to treat a malignancy, or patients who have had minor rectal surgery within the previous 8 weeks.
• Patients with an allergic reaction to latex.
• Patients with a metallic hip implant or any other metallic implant or device in the pelvis that might distort local magnetic field and compromise quality of MRI/MRSI.