Abstract
We present a case of thoracolithiasis, a rare thoracic disease. A 64-year-old female who underwent chest radiography and MDCT in mass screening at our hospital was found to have a round or oval calcified nodular opacity in the left posterior thoracic cavity at the 7th thoracic spine level. She had no symptoms. In reexamination of a chest CT image from 2 years ago，the calcified nodular opacity was observed in the left posterior thoracic cavity at the 11th thoracic spine level, not in the same position as in the latest image, so it had moved freely in the intrapleural cavity. Therefore, the nodular opacity was diagnosed as intrapleural loose body, so called thoracolithiasis. This chest CT study confirmed the mobility of thoracolithiasis, a rare condition.
