Flap of the sternocephalicus muscle in the repair of a partial defect in the trachea of a rabbit (Oryctolagus cuniculus)

Purpose: The current study aimed at evaluating the repair of a partial defect of the trachea with a muscle flap, an advanced technique that employs combined suture patterns. Methods: Sixteen healthy male New Zealand white rabbits were used as an experimental model. A partial defect in the trachea within the ventral region of the fourth to eighth tracheal ring was created. Subsequently, repair was initiated with a flap of the sternocephalicus muscle. The animals were divided into four groups for postoperative evaluation using clinical, tracheoscopic, and histopathological analyses. Each group was separated according to the time of euthanasia, programmed at interval of seven (G7), 15 (G15), 30 (G30), and 60 days (G60). Results: One animal from the G60 group died, whereas the other animals had good surgical recovery without serious changes in the breathing pattern. The major clinical signs observed were stridor and coughing. Tracheoscopy revealed secretions in the tracheal lumen, exuberant granulation, and stenosis. Histopathological analysis showed growth of the ciliary respiratory epithelium at the flap site 30 days after implantation. Conclusions: Partial repair showed satisfactory results owing to the anatomical location of the muscle, adequate vascular support, and structural and physiological maintenance without serious changes in the respiratory system.

Case report and immunohistochemical study of a malignant peripheral nerve sheath tumor in a dog / Relato de caso e estudo imuno-histoquímico de tumor maligno da bainha do nervo periférico em um cão

Malignant peripheral nerve sheath tumor is rare and rarely reported in dogs. The term neurofibroma/sarcoma is classically used when the tumor is composed of Schawann and perineural cells. This work describes the clinical, histopathological, and immunohistochemical case of a subcutaneous malignant peripheral nerve sheath tumor, most likely a malignant neurofibroma located in the pelvic member of a Rottweiler dog. Histopathological features and immunohistochemical analysis corroborated the diagnosis, showing positivity for S-100 protein, vimentin, and CD57, and was useful to distinguish this type of neoplasm from other malignancies of similar morphologies.(AU)

O tumor maligno da bainha do nervo periférico é raro e pouco descrito em cães. Classicamente, o termo "neurofibroma/sarcoma" é empregado quando o tumor é composto por células de Schwann e células perineurais. Neste relato são descritos os achados clínicos, histopatológicos e imuno-histoquímicos de um caso de tumor maligno da bainha do nervo periférico, provavelmente neurofibrossarcoma, localizado no subcutâneo do membro pélvico de um cão da raça Rottweiler. Os achados histopatológicos associados às observações imuno-histoquímicas contribuíram para o diagnóstico, sendo observada positividade para proteína S-100, vimentina e CD57, permitindo a diferenciação da neoplasia em questão de outros tumores malignos com características morfológicas similares.(AU)