sentences:  Polysplenia is the presence of multiple accessory spleens rather than one normal spleen.Accessory spleens may be formed during embryonic development when some of the cells from the developing spleen are deposited along the path from the midline, where the spleen forms, over to its final location on the left side of the abdomen by the 9th–11th ribs.The most common locations for accessory spleens are the hilum of the spleen and adjacent to the tail of the pancreas.