NAVLE（北美执业兽医考题）Day 490

A 13-year old spayed female Miniature Poodle presents with two mobile, soft, well-circumscribed, subcutaneous sternal masses, 3 cm and 6 cm in diameter, respectively. The owner had noticed one mass three months previously. Fine needle aspiration of both masses is performed and smears are prepared. A representative field of both specimens is illustrated below (Wright's 20X). What is your diagnosis?

一只13岁的雌性已绝育迷你贵宾由于胸骨处皮下出现的两个分别为3cm和6cm直径大小，游离，独立，柔软并且包膜完整的肿块前来就诊。主人说他3个月前就发现了其中一个肿块。两个肿块进行了FNA采样并且制备细胞学抹片。两个样本内的典型变化区域如下图所示。你的诊断是什么？