abnormal spleen morphology abnormal spleen white pulp morphology MP:0002357 MPheno.ontology Note that there is no consensus in the literature about which compartments constitute the white pulp or the ramifications of the microvasculature. In addition, notable differences exist between humans and rodents. In this ontology, the marginal sinus and marginal zone have been included as part of the white pulp. abnormal splenic white pulp morphology any structural anomaly 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