The yolk-sac tumor (YST; or endodermal sinus tumor [EST]) is a malignant germ cell tumor that usually occurs in the gonads. This tumor is considered one of the most common tumors in infants and children. The extragonadal presentation of an YST is not common and the mechanism of germ cell misplacement is not well understood. In the head and neck, these tumors usually are found in the central nervous system. A non-midline YST is very rare and most cases have been reported in the neck, nasopharynx, and oral cavity. The treatment of choice is chemotherapy followed by surgical resection or radiotherapy. To the authors' knowledge, there are very few reports of temporal bone and postauricular region YSTs that have been treated solely with surgical excision.
展开▼
