Splenomegaly is an enlargement of the spleen. The spleen usually lies in the left upper quadrant (LUQ) of the human abdomen. It is one of the four cardinal signs of hypersplenism, the other three being cytopenia(s), normal or hyperplastic bone marrow, and a response to splenectomy. Splenomegaly is usually associated with increased workload (such as in hemolytic anemias), which suggests that it is a response to hyperfunction. It is therefore not surprising that splenomegaly is associated with any disease process that involves abnormal red blood cells being destroyed in the spleen. Other common causes include congestion due to portal hypertension and infiltration by leukemias and lymphomas. Thus, the finding of an enlarged spleen; along with caput medusa; is an important sign of portal hypertension.Read more on Wikipedia
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