An 11-year-old boy was referred with acute paraplegia and local tenderness over the left costovertebral angle. He had also history of left side insidious back pain, low grade fever and malaise. Chest X-ray also showed a calcified focus probably a calcified lymph node at the left hilar region however no evidence of parenchymal infiltration was found.Helical abdominal CT was performed after taking the Plain radiograph of the thoracolumbar region. Image of Helical abdominal CT was given here.
Identify the lesion and what is the most likely diagnosis?