Eneking Classification of Tumours

Grade: assessment of biological aggressiveness

G0
- Histologically benign (well differentiated & low cell to matrix ratio)
- May be latent , active or aggressive benign lesions
G1
- Low grade malignant (few mitoses, moderate differentiation & local spread only)
G2
- High grade malignancy (frequent mitoses, poorly differentiated & frequent mitoses)

Site: anatomic setting of lesion

T0
- Confined within its capsule (does not extend beyond bounds of compartment of origin, may be distorted but remains intact)
T1
- Extra capsular extension but contained within anatomic compartment (eg cortical bone, joint capsule or fascia)
T2
- Extending beyond compartmental barriers (spreads beyond fascial plane without longitudinal containment)

Metastasis: nodal or blood borne tumour spread

M0
- No evidence of regional or distant metastases
M1
- Regional or distant metastases evident