<unk>  is an estimate of the amount of penetration of a particular cancer. It is performed for diagnostic and research purposes, and to determine the best method of treatment. The systems for staging<unk> ectal cancers depend on the extent of local invasion, the degree of lymph node involvement and whether there is distant metastasis. Definitive staging can only be done after surgery and histopathology of<unk> ectal carcinoma. An exception to this principle would be after a<unk> oscopic polypectomy of a malignant pedunculated polyp with minimal invasion. Preoperative staging of rectal cancers may be done with endoscopic ultrasound. Adjunct staging of metastasis include abdominal ultrasound, MRI, CT, PET scanning, and other imaging studies.
Colon cancer staging
Prostate cancer staging
Lung cancer staging
Prostate cancer screening
Cervical cancer staging
Cancer staging
PET response criteria in solid tumors
Breast cancer screening