| Red blood cell, shape abnormality, schistocyte | Helmet cell |
| Definition | Fragmented cell that has been amputated, leaving a straight border with sharp angulated edges (the missing parts of the cell have been split off into pieces, including triangular cells) |
| Conditions associated with the shape abnormality | Thrombotic microangiopathy (TMA), macroangiopathic hemolytic anemia |
| Mechanism of formation | Fragmentation of red cell, for example as a result of a break on a fibrin strand |
| Source/author | William Aird |
| Reviewed and edited by | Parul Bhargava |
| References | Int J Lab Hem 2012;34:107-116 |
