病例介绍 1984年10月,我校实验动物饲养场一豚鼠♀,14月龄,体重850克,右胸壁皮下见一拇指大椭圆肿块,三月后迅速增至拳头大。肿块突起于右胸侧壁,致使身体平衡失调,步态不稳。早期无明显症状,处死前精神沉郁食欲下降。尸检观察,肿块7.5×9×10厘米,占据整个右胸壁,周围有结缔组织薄膜包裹,与皮肤无粘连。肿块灰白、柔软、致密,不分叶,亦无肉眼可见出血及坏死。右侧肌肉 Case description In 1984 October, our school experimental animal farm a guinea pig, 14 months old, weighing 850 grams, the right chest wall see a large oval thumb subcutaneous mass, after March, quickly increased to the big fist. Mass protruding in the right thoracic wall, resulting in imbalance in the body, gait instability. Early no obvious symptoms, before the death of depressed mental appetite decreased. Autopsy, the mass 7.5 × 9 × 10 cm, occupy the entire right chest wall, surrounded by connective tissue film wrapped with no adhesion to the skin. Mass gray, soft, dense, regardless of leaves, no visible bleeding and necrosis. Right muscle