The giant cell tumor of bone (OCD) is a primary bone tumor that occurs most frequently in the third age of life, being located mainly at the distal femur. The development of a biopsy to establish the diagnosis and to begin appropriate treatment quickly is a fundamental to establish as early as possible surgical resection procedure. In this article a case of TOCG is presented in a patient of 30 years. Its etiology, signs and symptoms, diagnosis, as well as an adequate diagnostic and therapeutic procedures to achieve a positive resolution of this pathology is discussed.