Atypical chondroblastoma of the distal femur with exophytic mass: A rare presentation and diagnostic dilemma

Chondroblastoma is a benign epiphyseal chondromatous lesion typically seen as small, well-defined, eccentric with thin rim of surrounding bone sclerosis. Soft tissue extension, metaphyseal involvement, periosteal reaction, cortex breach though not pathognomonic, are reported in literature. We present case report patient chondroblastoma showing atypical radiological presentation exophytic mass order to give reader perspective on features and corroborating these finding intraoperatively histopathology.