Abstract: Lung teratomas derived from germ cells, have the potential to different to body cells. This tumor occurs in the male testes and female ovaries, extragonadal teratomas occur in residual primordial germ cells of abnormal embryonic development. Primary intrapulmonary teratoma is a rare benign tumor of the lung. In the past only to find case reports, lung teratomas is easy to misdiagnose in clinical work. This paper reports one case of teratoma in the upper lobe of the left lung in our hospital recently.

Key words: Lung neoplasm, Teratoma, Thoracoscopic, Case report