(b)(4).The results of this investigation concluded there were calcifications and perforations in all three cusps, and tears in cusps 2 and 3.Degenerative changes, loss of collagen, mixed bacteria and fungal/yeast forms were observed on all three cusps.The mixed bacterial and yeast were present within disrupted tissue and not associated with fibrin or inflammation and most consistent with contamination.No acute inflammation was observed.No evidence was found to suggest the cause of the calcifications, perforations, tears, degenerative changes and loss of collagen was due to an intrinsic defect in the valve, as supported by the analysis performed.The cause of the reported event remains unknown.
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