Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Littoral cell angioma of the spleen ?
    ### Response:
    Littoral cell angioma (LCA)  is a vascular tumor of the spleen. A vascular tumor is an overgrowth of blood vessels. The condition was first described in 1991. In many cases, LCA does not produce any symptoms and is found when tests are being performed for other reasons (an incidental finding).
    