Retrotracheal

A study that compares two groups of people: those with the disease or condition under study (cases) and a very similar group…

A research study in which the medical records of groups of individuals who are alike in many ways but differ by a…

Looking back at events that have already taken place.

A lymph node located in the retrosacral region.

Surgery to remove part or all of the prostate and some of the tissue around it. Nearby lymph nodes may also be…

Denoting the area posterior to the pubic bone.