An infection with the rare mycosis Chrysosporium parvum was diagnosed in a
European beaver (Castor fiber) shot in northern Sweden. The animal was in n
ormal body condition and no signs of disease were observed. In the lungs a
large number of nodules, up to 5 mm diameter, were observed. A large number
of adiaspores were observed in the interstitium of the lungs and in the me
diastinal lymph node. A chronic inflammatory reaction dominated by mononucl
ear leukocytes and giant cells was observed around the spores. This is the
first report of adiaspiromycosis (Chrysosporium parvum) in the European bea
ver.