The Ganoderma species are mushrooms used for herbal medicinal purposes in northeast Asia. Two cases of simultaneous reversible pancytopenia following the consumption of decoction of Ganoderma neojaponicum Imazeki are presented. Other than decoction of G. neojaponicum Imazeki no cause of pancytopenia could be identified. The patients recovered fully after conservative treatment. People who consume herbal medicines are often not aware of their side effects. Patients should be knowledgeable regarding the possible side effects of Ganoderma prior to its consumption.
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