A possible cause for this condition in dogs.
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“Splenic nodules frequently develop into small hematomas as a result of marginal zone circulation failure and blood accumulation, leading to hypoxia and necrosis. Life-threatening hemorrhage and hemoperitoneum occur secondary to rupture of the capsule. Ectopic splenic tissue should be considered as a possible cause of hemoperitoneum even in dogs that have had splenectomies.”
-Catherine A. Loughlin, DVM; Dominic J. Marino, DVM, DACVS; Curtis W. Dewey, DVM, MS, DACVS, DACVIM (neurology); and David A. Gamble, DVM, PhD, DACVP
From A challenging case: A lethargic and depressed dog with a long history of problems