Cabot rings are rare inclusions seen within the cytoplasm of red blood cells.

Cabot rings:

(1) thread-like blue or purplish ring or figure eight-shaped intraerythrocytic inclusion

(2) remnant of mitotic spindles

(3) contain iron and histones


Cabot rings are seen in dyserythropoiesis associated with:

(1) pernicious anemia

(2) lead poisoning

(3) overwhelming infection

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