The ultrastructural features of a case of spermatogonic (undifferentiated) seminoma in a mule are described. A summary is given, at the same time, of the main clinical, macroscopic and histologic findings observed within the tumor. Microscopically, many resemblances to equine seminomas could be detected, while the ultrastructural examination revealed, on the other hand, a closer resemblance to canine rather than to human seminomas of this type.[...
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