A 37-year-old patient complains of pain in the lumbar spine, which increases during walking, limited mobility, edema of the right side of abdomen. Focal tuberculosis is recorded in the anamnesis. X-ray shows destruction of adjacent surfaces of the bodies of the 12 lumbar vertebrae, vertebral bodies height is decreased, intervertebral fissure cannot be detected. Abdominal US reveals a growth 15x20 cm in size in the retroperitoneal space and echo signs of liquid. What diagnosis can be suspected?