Case report: splenomegaly and splenic sequestration in an adult with sickle cell anemia.

Splenomegaly in adult patients with homozygous sickle cell anemia (HbSS) is uncommon and splenic sequestration crises are rare. This paper describes a patient with HbSS who, at the age of 24, began to experience acute splenic sequestration crises. These episodes occurred with sufficient frequency and severity to warrant splenectomy. This case is presented to emphasize that, although rare, splenomegaly can persist in adults with homozygous HbSS and can be associated with severe and even life-threatening splenic sequestration. The incidence of splenomegaly in adults with HbSS and the factors linked to it will be discussed and the published reports of splenic sequestration crises in this patient population reviewed. It appears that high hemoglobin F (HbF) levels and alpha-thalassemia may be important etiologic factors in causing persistence of splenomegaly and predisposing patients to splenic sequestration crises.