Paraphimosis is the inability of the stallion or gelding to retract the penis into the prepuce. This condition most frequently develops as a sequelae to genital trauma and the associated edema and or hematoma formation. It may also result from penileparalysis, which can be sedative induced (phenothiazine tranquilizers), found in association with severe debilitation, equine herpes virus-1 (EHV 1), and rabies infections, or may develop as a sequelae to priapism. Less commonly, it may be a manifestation of disease processes that result in extensive ventral and preputial edema, for example, dourine (Trypanosoma equiperdum) or purpura hemorrhagica.
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