Task: Instance Description Understanding (ontology: Sciences/Computer_Science)

Which of the following definitions best describes the instance 'pT0 (kidney)'?

A. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor grossly extends into vena cava above the diaphragm or Invades the wall of the vena cava.
B. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that there is no evidence of primary tumor.
C. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor invades beyond Gerota fascia (including contiguous extension into the ipsilateral adrenal gland).
D. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor extends into major veins or perinephric tissues but not into the ipsilateral adrenal gland and not beyond the Gerota fascia.

Answer: A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that there is no evidence of primary tumor.