He 80, very tall 6' 3", robust, hypertensive, undergone CABG, absolutely normal MAN, c/o cough with expectoration from two months, not getting alright with antibiotics, bronchodilators, mucolytics, antiallergics. CBC normal. X-ray chest is posted for further discussion.

H/O allergic rhinitis is present, he is coughing out big solidified nodules of sputum. What is the cause of this, looking at pictures of X-ray posted?