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).
The MCV reflects the size of red blood cells. The MCH and MCHC reflect the hemoglobin content of red blood cells. These RBC measures are used to diagnose types of anemia. Anemias are defined based on cell size (MCV) and amount of Hgb (MCH).1  MCV less than lower limit of normal: microcytic anemia.he MCH and MCHC reflect the hemoglobin content of red blood cells. These RBC measures are used to diagnose types of anemia. Anemias are defined based on cell size (MCV) and amount of Hgb (MCH). 1  MCV less than lower limit of normal: microcytic anemia.