Chest wall hamartoma Is a very rare disease. The female infant was suffered from frequent upper respiratory infection. The chest AP revealed destruction of the ribs and widening of the intercostal space Chest CT demonstrated well-defined solid and cystic extrapleural mass. Chest M Rl revealed high signal and low signal intensities In the mass. In December, 1995, she underwent excision of the mass with partial resection of the ribs and ch st wall reconstruction with thick Cortex patch. The chest wall hamartoma was confirmed with histopathological examination. The postop course was smooth and uneventful.