The realization of patients′right of informed consent depends on the physician′s description of the disease status, medical treatment measures and risks. Performing the obligation of informing according to the laws is conducive to effective communication with patients on the diagnosis and treatment of disease, thereby preventing and reducing medical disputes. Meanwhile, the informing content constitutes its own legal constraint. Based on a case of medical dispute, this paper particularly discussed the performance of obligation of informing, medical risk sharing, as well as the ethical requirements.%患者知情同意权的实现依赖于医师对疾病状况、医疗措施及风险的说明，医师依法履行说明义务有利于与患者就疾病诊治进行有效沟通，从而预防、减少医疗纠纷，同时医师也就说明的内容构成对其自身的约束。通过一起医疗纠纷案例，侧重探讨医师说明义务的履行与医疗风险的分担，以及医师全面适当履行说明义务的伦理要求。
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