helmet cells

An aberrant shape form of erythrocytes (for normal morphologies see also: discocytes; for aberrant forms see: poikilocytes) (Ward, 1979). A variant of helmet cells has been termed keratocytes (note that this term must be seen in context as the term keratocytes usually refers to corneal stromal cells.

In some publications, the term Bite cells may refer to helmet cells. Bite cells are more or less indistinguishable from helmet cells but show minor morphological alterations such as smoother arc-like shapes. Bite cells are observed in different clinical settings and are characteristic of hemolysis induced by drugs (Ward, 1979).

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Entry last modified: October 2006