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).
Microcytic anemia is a term used to characterize any type of anemia caused due to small red blood cells in human blood. In Microcytic anemia the red blood cells are paler than usual. Microcytic anemia is the most common types of anemia which is found. Causes. In most of the cases Microcytic anemia is caused because of the deficiency of iron. Thus it is the most sought after thing when a person is contacted with Microcytic anemia.