Long-term testicular position, volume and 18F-FDG-uptake after orchidopexy of congenital undescended testis.

Long-term consequences of orchidopexy for congenital undescended testis on
fertility are hardly known. Partly, this is because evaluation of the seperate
function of both testes is difficult.
The PET-CT-scan, which shows the FDG-uptake (parameter for metabolism) of both
testicles apart from each other, seems a promosing research on the funtion of
the testis after orchidopexy.
We hypothesise the orchidopexied testis has a lower metabolism than the
contralateral testis and lower than the testis in men of the general
population.

Evaluation of long-term position, volume and FDG-uptake of the orchidopexied
testis because of congenital undescended testis.

long-term follow-up study

Men will be requested to participate in the study and visit the MCA once to
receive

- a short questionnaire
- physical examination
- ultrasonographic examination
- PET-CT-scan

The short questionnaire, physical and ultrasonographic examination are
painless, without any risks and will take a quarter of an hour.

Adverse effects of the PET-CT are not expected. The PET-CT has a certain
radiation burden since every radiation is potentially harmful. However,
concerning radioactive exposure, the study protocol is designed according to
the ALARA principle (As Low As Reasonably Achievable). For a 75 kg man the
radiation burden will approximately be 2 mSv (whereas for a regular PET-CT, the
radiation burden is between 6-10 mSv).