abnormal spleen white pulp morphology decreased spleen white pulp amount MP:0008479 MPheno.ontology decreased splenic white pulp amount reduced spleen white pulp amount reduction in the quantity of the parenchymatous tissue of the spleen that surrounds splenic blood vessels, consists of compact masses of lymphatic cells and is where foreign material removed from the blood is used to initiate an immune reaction that results in the production of antibodies