“…Patients usually have no discomfort symptoms, and it is often accidentally found in physical examination, imaging examination, abdominal surgery and other cases [ 2 , 4 ]. Spleen tissue or cells can be transplanted not only in various parts of the abdominal cavity [ 4 , 6 , 8 , 13 – 15 ], but also in the retroperitoneal cavity, the chest and even the brain [ 1 , 3 , 6 , 16 – 18 ]. There have been reported cases of spleen transplantation in the kidney and adrenal gland [ 17 , 18 ].…”