I have a 6 month male Burmese kitten with a stonking systolic heart murmur. My vet did a 'scan' today pre-neutering and noted right ventricular enlargement. Cyrus is well with no obvious signs of heart failure. The vet thinks that he could have pulmonary (valve) stenosis or patent ductus arteriosus (PDA) though the latter is less likely as the murmur does not sound like this. The consensus is that we 'wait and see' whether he develops signs of heart failure. I am aware that PDA is operable though doing some internet research on pulmonary stenosis I cannot seem to ascertain whether this is something that is commonly 'treatable' in cats (i am medically qualified (human(!)) Does anyone have any relevant experience? Cyrus is not covered for this by his pet insurance as it was discovered very early on. The vet offered referral but if the discussion involved possibly risky surgery not ignoring several thousand pound (I would guess) expense, would this be the right way to proceed?