OrthoNet

Tumor Staging

Benign:

Stage 1 (latent) - benign histology, intracapsular without metastases
Stage 2 (active) - benign histology, extracapsular, intracompartmental without metastases
Stage 3 (aggressive) - benign histology, extracapsular, extracompartmental, +/- mestastases

Malignant:

Stage I - low grade, no mets
A. intracompartmental
B. extracompartmental
Stage 2 - high grade, no mets
A. intracompartmental
B. extracompartmental
Stage 3 - low/high grade with mets
A. intracompartmental
B. extracompartmental
- compartments - bounded by fascial structures or bone which act as barriers towards the spread of actively growing lesions
- tumors that involve major neurovascular bundles = extracompartmental