Atypical spindle cell osteosarcoma in the diaphysis and proximal epiphysis of the tibia: clinical case report

Osteosarcoma is the most frequent primary malignant tumor at the level of the bone system, characterized by the formation of osteoid from tumor cells. Its central location is the metaphysis of the long bones; however, the proximal part of the tibia is also one of the most affected, with 50% to 60% of the cases. This work aims to present a case study of a male patient diagnosed with fusocellular osteosarcoma located in the diaphysis and proximal epiphysis of the tibia who showed signs and symptoms three months before the evaluation, secondary to a trauma located in his lower limb. From the imaging point of view, an image suggestive of a metaphyseal tumor lesion that extended to the epiphysis and medullary canal was observed. The histopathological and imaging study concluded that the patient presented a grade II fusocellular osteosarcoma in the right proximal tibia, which merited surgical management and chemotherapy with an excellent clinical response. The importance of scientific and biomedical advances is evidenced, allowing better control of these diseases and treatment that generates better conditions for post-surgical rehabilitation and life expectancy.