MATURE TERATOMA OF THE UTERINE CERVIX WITH PULMONARY DIFFERENTIATION

Teratomas of the uterus are very rare, and a uterine teratoma with pul monary differentiation has not, to our knowledge, been described previ ously. In this article, we report such a case in a 33-year-old woman, who presented with heavy vaginal bleeding and a polypoid mass of the u terine cervix. The cervical lesion was composed entirely of mature lun g tissue, including bronchial, bronchiolar, and alveolar structures. T he presence of well-differentiated respiratory epithelial cells, ie, C lara cells and alveolar type II cells, is confirmed by immunohistochem istry. The patient had no history of dilatation and curettage; therefo re, implantation of fetal tissue could be excluded from the differenti al diagnoses. Since this is a newly developed mass in an adult individ ual, we favor a neoplastic process over heterotopia and interpret the lesion as unilateral lung development in an extragonadal mature terato ma.