Triangular cells

By William Aird

Triangular red cell (blue arrow) in a peripheral smear from an 83-year-old man with valve hemolysis (100x, oil).

Red blood cell, shape abnormality, schistocyteTriangular cell
DefinitionSmall red cells fragments of varying (though typically distorted) shape with sharp angles or spines. May stain darkly or may appear pale as a result of hemoglobin loss of at the time of fragmentation.
Conditions associated with the shape abnormalityThrombotic microangiopathy (TMA), macroangiopathic hemolytic anemia
Mechanism of formationFragmentation of red cell
Source/authorWilliam Aird
Reviewed and edited byParul Bhargava