Abstract：
This work aimed to characterize the clinic-pathological presentation of an outbreak of auricular and laryngeal chondritis in pigs. Visits were made to pig farms, where the clinical history was obtained, and clinical and postmortem examinations were performed. In those farms, 3% to 4% of pigs presented otohematomas, which started in the nursery and extended to the finishing phase. Moreover, some finishing pigs presented with respiratory distress, initially characterized as inspiratory dyspnea, associated by an uncommon respiratory stridor and culminating in death. Grossly, nursery piglets had enlarged ears, and on the cut surface, the cartilage was fragmented and associated with blood clots. In the finishing phase, in addition to auricular lesions, the epiglottis and arytenoid cartilages were thickened and distorted, which partially occluded the lumen. Microscopically, the laryngeal and auricular cartilages were fragmented, displayed a loss of matrix basophilia, and were surrounded by lymphohistiocytic inflammatory infiltrate, with occasional multinucleated giant cells and fibrosis. The lesions exclusively affected elastic cartilages. The disease in finishing pigs led to increased mortality and was a differential diagnosis to respiratory challenges. It was not possible to determine the factor that triggered this condition; however, a nutritional association is suspected. To the authors\' knowledge, this is the first report of primary auricular and laryngeal chondritis in pigs.
摘要：
这项工作旨在表征猪耳和喉软骨炎爆发的临床病理表现。参观了养猪场，获得临床病史的地方，并进行了临床和尸检。在那些农场里,3%至4%的猪出现耳血肿，从托儿所开始，一直延伸到最后阶段。此外，一些肥育猪出现呼吸窘迫，最初表现为吸气性呼吸困难，与罕见的呼吸道喘鸣有关，并最终导致死亡。严重的,苗圃仔猪的耳朵增大了，在切割表面上，软骨碎片化,并伴有血凝块.在完成阶段，除了耳廓病变,会厌和关节软骨增厚和扭曲，部分堵塞了管腔。微观上,喉和耳软骨支离破碎，显示基质嗜碱性粒细胞的损失，周围有淋巴组织细胞炎症浸润,偶有多核巨细胞和纤维化。病变仅影响弹性软骨。肥育猪的疾病导致死亡率增加，并且是呼吸系统挑战的鉴别诊断。无法确定触发此情况的因素；但是，怀疑是营养协会。就作者所知，这是猪原发性耳和喉软骨炎的首次报道。
