<prompt> Popcorn calcification on chest X-ray seen in: PGI Dec 2007HamartomaGranulomaMetastasisSarcoidosis  <response>: Ans A Hamartoma Popcorn calcificationQ is pathognomonic for hemartoma on chest x-ray-Harrison 17th562Acute histoplasmosis cause popcorn calcification of mediastinal lymph node -Danhert Radiology Review manual Sth498Degenerated fibroadenoma also form popcorn like calcificationr- Danhert Radiology Review manual 5th541Hamartoma Danhert Radiology Review manual 5ch490 Location: 23 peripheral; endobronchial in 3-10-20; multiplicity rate Round smooth lobulated mass 4 cm averages 2.5 cm calcification in 15-20 almost pathognomonic of chon droid popcorn type Fat density DIAGNOSTIC Cavitation extremely rare 