Does anyone know what this is?

Jamie โ€ข 19 ๐Ÿ’๐Ÿผโ€โ™€๏ธ diabetic ๐Ÿ’‰ Kyden James 12-24-18 ๐Ÿ‘ถ๐Ÿผ๐Ÿ’™ 4-15-2017 ๐Ÿ’‘โค๏ธ

I just got an ultrasound today and they told me my sons right pulmonary artery is prominent. Can anyone explain to me what that means? They didnโ€™t say much about it just scheduled me three more appointments ASAP and told me to call some cardiologist..