A 65-year-old man experienced difficulty urinating, which was initially suspected to be prostate disease. Further examination with ultrasound and CT scan revealed a well-defined, solid presacral tumor displacing the rectum and prostate. MRI of the tumor showed central necrosis and enhancement with contrast. Blood tests were normal. The doctors are seeking a diagnosis for this presacral mass found in the patient.

1. CASE 305:Presacral Tumor, Dr PHAN THANH HẢI, MEDIC MEDICAL
CENTER, HCMC, VIETNAM.
Man 65 yo in trouble and difficult mictation, looked like in prostate disease.
Ultrasound detected one presacral ovoid mass causes deplacement of
rectum and prostate (US picture 1).
Pelvis MSCT of this tumor presented solid, retrorectum, and presacral, well
bordered, and not connected to rectum or sacrum (see CT1, CT2).

2. MRI with gado of this tumor showed central necrosis, well enhanced with
gado contrast (see MRI 1, 2 ,3).

3. Blood tests detected abnormal anything.
What is your suggestion for diagnosis?.