In brief: classifications in brief: enneking classification: benign and malignant tumors of the musculoskeletal system.

There are separate staging systems for benign and malignant mesenchymal tumors. The staging system for benign musculoskeletal tumors (Table 1) consists of three categories: ie, latent, active, and aggressive [4]. The classification is based on radiographic characteristics of the tumor host margin. Well-demarcated borders are indicative of latent lesions whereas indistinct borders result from permeation into host bone and a more aggressive lesion [11]. For benign tumors, local aggressiveness and incidence of recurrence increase with increase in surgical grade. Metastases are rare for locally aggressive benign lesions but do rarely occur in giant cell tumor and chondroblastoma [8, 12].