Abstract
Disseminated lymphoma was diagnosed in an 8-year-old male bonobo (Pan paniscus). The male bonobo presented with a 4-6 week history of dyspnea and facial swelling around the eyes; thoracic radiographs and computed tomography scan indicated a craniodorsal mediastinal soft tissue mass. Upon gross examination, there was a large, cream to white mass expanding the mediastinum and pericardial sac. The mass extended along the thoracic aorta and cranial vena cava, through the thoracic inlet, along and encircling the trachea, and bilaterally into the thyroid glands. Microscopically, neoplastic lymphocytes were present in the thymus, trachea, lungs, kidney, heart, and numerous other tissues. Immunohistochemical staining of neoplastic lymphocytes revealed diffuse immunoreactivity for cluster of differentiation (CD)3 indicating T-cell lymphoma. Routine viral screening was negative via polymerase chain reaction.
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