With the exception of the reticuloses, primary malignant tumours arising in the spleen are rare, but from time to time examples have been reported which appear to be angioblastic in character and in some cases seem to cause metastases in the liver and elsewhere (Langhans, 1879; Theile, 1904; Jores, 1908; Dowd, 1915; Wright, 1928; Schlopsnies, 1929; Paine, 193 1; De Navasquez, 1936; Wright, 1949...