Figure 1. Burr cells (echinocytes) are shown in this image. These cells have small, uniform projections over the entire surface of the red cell membrane. This abnormality is often an artifact due to slow drying in preparation of the peripheral smear but can be seen in patients with uremia.
Figure 2. The small, blunted projections of the burr cells circumscribing the entire red cell membrane are readily apparent in this view. This morphologic feature should not be confused with spur cells (acanthocytes), which have spiculated membrane projections of variable size at random points on the red cell membrane.