My mother is a 65 year old smoker. She has had a persistant cough for 3 months, loss of weight, breathlessness (cannot even make a bed without being out of breath), tired all the time, looks yellowy grey in colouring. Xray said possible intertial shadowing on both lungs, hyperflammation, she is now on an other dose of steriods and antibiotics. Got fast tracked by doctor to a chest specialist. Clinically her chest is now clear, no COPD, what could this be