Bilateral scrotal swelling in a boar

Introduction: A 3-year-old Landrace boar with a bilateral swelling of the scrotum was submitted to the Swine clinic in August. History reported a period of hyperthermia, anorexia, depression and weight loss in May. Recovery was obtained after a treatment based on antibiotic (lincomycin and ceftiofur) and anti-inflammatory (steroid) medication injections. On July, the boar fell down after a supervised natural mating. Materials and Methods: The present poster describes our clinical approach and conclusions. Results: The boar had a good general condition and a normal appetite. Scrotal palpation was painless. The left hemiscrotum was more enlarged than the right one. Serological analysis allowed to exclude Aujeszky disease virus, Brucella suis and Chlamydia spp., the main agents responsible for orchitis in pigs. Ultrasonography revealed multiple hypoechogenic cavities around both testicles. Semen analysis performed using microscope showed azoospermia. Dissection of the scrotal tissues - performed in October - revealed the presence of kystic structures filled with serous fluid; the largest one had a diameter of approximately 15 cm. These kystic structures were surrounded by an abondant fibrous connective tissue. Histological examination showed the presence of large amount of lymphocytes and hemosiderophages around the kysts. No sign of spermatogenesis was detected in testis. An hyperplasia of the interstitial tissue in detriment to seminiferous tubules was also observed. Conclusion: These results led us to confirm the traumatic origin of the bilateral scrotal swelling observed in this boar. The lesions were the result of a partial resorption of a complex extratesticular hematoma