Welcome to HCM forum.
Please do not worry.
Broncho pulmonary markings
are impressions on X-ray chest seen in normal person due to blood vessels in the lungs .
Accentuated markings may indicate increased blood flow to lungs which can occur in normal person as well as in illnesses like pneumonia
, viral respiratory infections or allergic pneumonitis
However it's not much worrisome if there is no other lesion in lung and if patient is stable.
Hence all X-rays are to be correlated clinically .
Hope I have answered your query.
Wishing you good health.