Background: Common B cell lymphoma locations are lymph nodes, skin, bone, mediastinum and it accounts for 2 % of NHL. Giant solitary spinal B-LBL has not yet been described. Case presentation: A 15-years old boy was admitted for a painful swelling of the thoracolumbar spine and paraplegia. MRI showed a voluminous mass of the thoracolumbar spine. Initial treatment consisted of surgical decompression and stabilization, followed by chemotherapy and radiotherapy. Histological examination showed a B-LBL. The quality of life improved significantly. Conclusion: To the best of our knowledge, this is the first case of giant solitary spinal B-LBL ever reported. Indication to choose a treatment method over another should weigh on individual priorities. Surgery should be considered as initial treatment option in this atypical lesion.