Final answer:
A patient with sickle cell disease experiencing severe signs of anemia and an enlarging spleen is likely going through a splenic sequestration crisis. This condition can be life-threatening and requires treatment such as blood transfusion and possibly splenectomy.
Step-by-step explanation:
The patient with sickle cell disease experiencing severe signs of anemia and an enlarging spleen is likely going through a splenic sequestration crisis. This is a life-threatening condition where red blood cells get trapped in the spleen, leading to a sudden decrease in circulating blood volume. The treatment for this crisis involves blood transfusion to replace the trapped blood cells and relieve symptoms. In some cases, a splenectomy (surgical removal of the spleen) may also be necessary.