<prompt> Chest X-ray showing opacity in the lung with irregular calcification is suggestive ofLung carcinomaHamartomaHydatid cystAdenoma  <response>: Ans. b Hamartoma Ref. Harrisons medicine 17lh558Opacity in the lung with irregular calcification, i.e., poporn calcification Hamartoma.The calcification of hamartomas can be stippled or conglomerate, referred to as popcorn calcification. Opacity in the lung with Bulls eye calcification Lung granuloma Opacity in lung with Air crescent SignAspergilloma fungal ball. Asympyomatic opacity in the lung without calcification can be Adenoma bronchial atresia. Opacity in the lung with corona radiate and or amorphous calcification Lung carcinoma Opacity in lung with cyst in cystfloating water lillyCallomate signHydatid cyst. Opacity in the lung without calcification if at all present-is arc-like Hydatid cyst Also know:Carneys triad: multiple pulmonary chondromas gastric epithelioid extra-adrenal pheochromocytomas paragan- glioma. 