A 6-year old intact male domestic short haired cat presents with acute onset exophthalmos of the right eye in the past 2 days. He is painful on palpation around his eye and head. The eye can be retropulsed some, but there is resistance present. He has not been eating in the past day and has a rectal temperature of 103.4F (39.7 C). What is the most likely diagnosis?
一只6岁的雄性未绝育家养短毛猫由于过去2天内突然出现的右眼球突出前来就诊。在触诊其眼睛周围和头部的时候疼痛明显。突出的眼球可以轻微还纳一部分，但是阻力非常明显。他以及1天没吃饭了并且其直肠温度是39.7℃。最可能的诊断是什么？
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