无论是良性内分泌肿瘤还是恶性内分泌肿瘤都显示一定程度的细胞异型性，因此仅从组织学上很难区分肿瘤的良恶性。
Both benign and malignant endocrine neoplasms demonstrate some degree of cellular pleomorphism, so it is not easy to tell benign from malignant on histologic grounds alone.
经过良后的警示标志重点强调了该药物对一定的患者可能会引起或加重心衰。
The upgraded warning emphasizes that the drugs may cause or worsen heart failure in certain patients.
结论：灰阶超声在鉴别良、恶性胸肌淋巴结中具有一定的应用价值。
Conclusion: Gray - scale ultrasonography is applicable to help identifying normal and malignant pectoral nodes.
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