这是一例少见的畸形。这足以考验你的观察能力和对解剖学知识的运用。在医学上许多疾病仅仅通过描述你所见的就能得到诊断。你认为这个肺动脉瓣有多少个瓣叶？这是一个有四个瓣叶的瓣膜。
This is an unusual anomaly (and not too significant for the patient).This demonstrates the power of simple observation and use of your knowledge of anatomy. Many conditions in medicine can be diagnosed by just describing what you see. How many cusps are there supposed to be on this pulmonic valve. This is a quadricuspid valve.