can occur in non-smokers too (though the incidence is lower than in smokers).
A shadow in the x ray is very non-specific. It can be caused by variety of conditions of which lung cancer is one of them.
Her enlarged heart
, high blood pressure
may also be related to her hoarse voice (cardiac conditions also can cause hoarse voice).
Having said that, it is not safe to attribute the shadow to her cardiac condition. It is better to get a CT scan
scan is better) and a guided FNAC if necessary.
Diagnosing the cancer at the earliest stage offers the best chance of cure.