Nuclear medicine

In recent years, new imaging studies have emerged in the diagnosis and monitoring of metastatic urological tumors.We review 41 patients with suspected urothelial or renal tumor recurrence, analyzing the diagnostic performance of PET-CT performed between 2013 and 2016. We collected 17 urothelial and 24 renal tumors, with a median follow-up of 30 months. 29.3% of urothelial cells correspond to high grade and 29.3% of renal cells to clear cell carcinoma Furhman II. Overall, imaging studies detected recurrences in 34 patients.

Imaging techniques

CT was positive in 83% of patients, while PET was positive in 75.6%. The TC / PET coincidence was 50%. PET detected more disease in 41% of cases compared to 5% with CT. This supposed a change in the therapeutic strategy in 40% of the patients. Sensitivity, specificity, positive and negative predictive value for CT and PET were 92 and 92%; 57 and 100%; 92 and 100% and 57 and 70%, respectively.

In urological tumors, PET presents a sensitivity similar to standard imaging techniques, but with greater specificity, positive predictive value and negative predictive value. This meant a change in the treatment strategy in 40% of the patients in our series. PET probably becomes the reference test in the extension and follow-up studies of most urological tumors.

Urological tumours

New imaging studies have appeared in recent years for the diagnosis and follow-up of metastatic urological tumours. A total of 41 patients were reviewed with suspected recurrence of a urothelial or kidney tumor, analyzing the diagnostic performance of PET-CT scans between 2013 and 2016.

New imaging studies have appeared in recent years for the diagnosis and follow-up of metastatic urological tumours. We collected 17 urothelial tumours and 24 renal tumours, with a median follow-up of 30 months. A total of 39.3% of the urothelial tumours were high grade and 29.3% of the kidney tumours were clear cell Fuhrman II.

Similar sensitivity

As a whole, the imaging studies detected recurrences in 34 patients. CT was positive in 83% of the patients, while the PET scan was positive in 75.6%, CT / PET coincidence was 50%. The PET scan detected further disease in 41% of the cases compared to 5% by CT. This resulted in a change of therapeutic strategy in 40% of the patients. Sensitivity, specificity, positive predictive value and negative predictive value for CT and PET scans were 92% and 92%, 57% and 100%, 92% and 100%, and 57% and 70% respectively.
The PET scan showed similar sensitivity for urological tumours to the standard imaging techniques but with higher specificity, positive predictive value and negative predictive value. Therefore This led to a change in treatment strategy for 40% of the patients in our series. Because The PET scan will probably become the standard test in the extension and follow-up studies of most urological tumours.