“…2 They are usually a part of MHE 8 and constitute 1% to 1.5% of total cases of osteochondromata. 3,[12][13][14] Chest wall osteochondromata can present with local complications of cosmetic or physical discomfort, 15 intrathoracic complications of pneumothorax, 3,16 pericardial effusion, 17 hemothorax, 13,14,[18][19][20] and consequent empyema 1 or with sarcomatous transformation of the osteochondromata. 3,[12][13][14] Chest wall osteochondromata can present with local complications of cosmetic or physical discomfort, 15 intrathoracic complications of pneumothorax, 3,16 pericardial effusion, 17 hemothorax, 13,14,[18][19][20] and consequent empyema 1 or with sarcomatous transformation of the osteochondromata.…”