Cabot rings

Cabot rings are thin, red-violet staining, threadlike strands in the shape of a loop or figure-8 that are found on rare occasions in erythrocytes.

Cabot rings have been observed in a handful of cases in patients with megaloblastic anemia, hemolytic anemia, lead poisoning and other disorders of erythropoiesis.

He is also credited with discovering Cabot rings, and for describing, along with his colleague, Locke, the eponymous Cabot-Locke murmur, a diastolic murmur occasionally heard in severe anemia, unrelated to heart valve abnormalities.