Matthew was treated for urethrohydronephrosis, and at this time in the peritoneal space grew neuroblastoma - a malignant tumor. By January 28, when the final diagnosis was made, the tumor had grown to 13 centimeters. Rambam State Medical Center in Israel received Matthew for treatment. Matviychyk underwent a two-month examination and received a chemotherapy plan, followed by a large-scale operation. Matviychik recovered, but he was already happy and even went home with a little hair.