[Transplantable cancer of the urinary bladder and hemangiopericytoma obtained by means of the ectopic transplantation of tissues of the fetal urinary bladder].

Organ-like cysts appear to develop after subcutaneous transplantation of minced tissues of fetal urinary bladder into adult syngeneic recipients. These are multilocular cysts lined with epithelium and filled with secretion. Many months later they undergo a spontaneous malignant tranformation. Transplantable strains of vesical cancer and hemangiopericytoma have been obtained.