Identify the structure as marked by a “black arrow” in the blood smear of a patient shown below?
A. Cabot rings.
B. Spurr cells.
C. Burr cells.
Ans: A. Cabot rings
- They are thin, red-violet staining, thread like strands in the shape of a loop or figure-8 that are found on rare occasions in red blood cells (erythrocytes).
- They are believed to be microtubules that are remnants from a mitotic spindle, and their presence indicates an abnormality in the production of red blood cells.
- Cabot rings have been observed in megaloblastic anemia, lead poisoning, severe anemia, leukemia, myelodysplastic syndromes, and other cases of dyserythropoiesis.