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Last revised by Dr Daniel J Bell on 05 Nov 2021

Thrombocytosis (plural: thrombocytoses) is a general term and is defined as a rise in platelet count to over two standard deviations above the normal range. Its exact quantitative definition is variable, but generally equates to a platelet count greater than 400-450x109 cells/L. 

Although there are no direct imaging features, it is useful for radiologists to be familiar with the condition in interpreting imaging associated with complications.


It can arise from a broad spectrum of pathologies, either primary or secondary:

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