Fibroma desmoplásico de la columna lumbar

introduction: the desmoplastic fibroma was defined by who in 2000 as a benign tumor, rare, composed by fusiform cells with a minimal cellular atypia and an abundant collagen production. many authors consider it as locally aggressive and benign tumors but rarely to metastasize. objective: to present a rare case of desmoplastic fibroma in lumbar spine and to discuss the diagnosis and treatment of this affection. description: this is the case of a patient aged 20 presenting with a painful picture in lumbar spine. a simple radiography was taken showing an osteolytic image of spinal apophysis of l3 and an open incisional biopsy determining a bone desmoplastic fibroma. surgical treatment was applied with wide edges of injury by anterior and posterior combined approach. in repair process we used pedicular screws, anterior plate and autologous peroneal graft. results: after surgery pain disappeared and the neurologic function became normal. there were complications related to the bone graft and infection in surgical site. during a 3-month follow-up patient had not relapse. conclusion: the bone desmoplastic fibroma also known as bone desmoid cyst is a very infrequent tumor and of difficult diagnosis, which must to be considered among the differential diagnoses of spinal column tumors. always it is necessary a histological confirmation. the block resection of injury must to be curative followed by the repair to preserve the spinal stability.