As is seen in this patient, the sphenoid sinus may extend beyond the body of the sphenoid bone to pneumatize or involve the adjacent regions. In this case, a lateral recess has been formed within the greater wing of the sphenoid sinus.
1 In general, there are three major types of anemia, classified according to the size of the red blood cells:  If the red blood cells are smaller than normal, this is called microcytic anemia. The major causes of this type are iron deficiency (low level iron) anemia and thalassemia (inherited disorders of hemoglobin).
Some diseases of the red blood cells are inherited. Diseases of the red blood cells include many types of anemia, a condition in which your body can't produce enough normal red blood cells to carry sufficient oxygen throughout the body.People with anemia may have red blood cells that have an unusual shape or that look normal, larger than normal, or smaller than normal.Symptoms of anemia include tiredness, irregular heartbeats, pale skin, feeling cold, and, in severe cases, heart failure.eople with anemia may have red blood cells that have an unusual shape or that look normal, larger than normal, or smaller than normal. Symptoms of anemia include tiredness, irregular heartbeats, pale skin, feeling cold, and, in severe cases, heart failure.