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Written 400 B.C.E
Translated by Francis Adams
Fistulae are produced by contusions and tubercles, and they are also occasioned
by rowing, on horseback, when blood accumulates in the nates near the anus.
For, having become putrid, it spreads to the soft parts (the breech being
of a humid nature, and the flesh in which it spreads being soft), until
the tubercle break and corrupt below at the anus. When this happens, a
fistula is formed, having an ichorous discharge, and faeces pass by it,
with flatus and much and abomination. It is produced, then, by contusions
when any of the parts about the anus are bruised by a blow, or a fall,
or a wound, or by riding, or rowing, or any such cause. For blood is collected,
and it, becoming corrupted, suppurates; and the from the the same accidents
happen, as have been described in the case of tubercles.