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Parachordoma of tibia--a case report.

A rare case of a 24-year old male patient with 'parachordoma' of left tibia having the characteristic histopathological and histochemical features of chordoma occurring in an unconventional site, which was clinically and radiologically diagnosed as osteoclastoma is presented here. The case is presented considering the extreme rarity of the lesion in literature in long bones.