A 50 year old lady presented with a 3 month history of pain in the lower third of the right thigh. There was no local swelling; tenderness was present on deep pressure. Plain X-rays showed an ill-defined intra medullary lesion with blotchy calcification at the lower end of the right femoral diaphysis, possibly enchondroma or chondrosarcoma. Sections showed a cailaginous tumor. Which of the following histological features(if seen) would be most helpful to differentiate the two tumours?: (A) Focal necrosis and lobulation, (B) Tumor permeation between bone trabeculae at periphery, (C) Extensive myxoid change, (D) High cellularity
Answer is B. High cellularity