Thymoma in a Cat

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  • 猫の胸腺腫の1例
  • 猫の胸腺腫の1例(短報)
  • ネコ ノ キョウセンシュ ノ 1レイ タンポウ

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Thymoma was found in a 10-year-old, female, mongrel cat. She was referred to our hospital with a history of anorexia and acute severe respiratory distress. Physical examination revealed muffled heart sounds and lung sounds were inaudible. Thoracic radiography revealed accumulation of intrathoracic fluid and a mass in the mediastinum that displaced the heart caudally and compressed the cranial lung lobes. About 100 ml of intrathoracic fluid removed by thoracocentesis contained small, mature lymphocytes. After removal of intrathoracic fluid, the general condition improved temporarily. At necropsy, a circumscribed tumor measuring 10×8×5 cm was found in the anterior mediastinum. The mass was soft and contained cystic cavities of various sizes filled with a pale yellowish-red fluid. Histologically, the tumor was characterized by cystic, solid, or cord-like growth of epithelial cells, diffuse infiltration of small, mature lymphocytes and formation of Hassall's body-like structures.

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