Abstract
Background. We report a case of adenocarcinoma arising in a vaginal müllerian cyst. Although the most common pathological type of vaginal cysts is müllerian cyst, malignant change of a müllerian cyst has not been reported before. Case. A 48-year-old woman presented with a 3 cm-sized ruptured vaginal cyst. The cyst had been asymptomatic for 20 years, but ruptured 2 months before her visit. After the diagnosis of atypical glands was made on punch biopsy of cyst wall, she underwent an operative excision and the final histopathologic examination revealed an adenocarcinoma arising in the müllerian cyst. After the surgery, she received a course of external radiation therapy followed by brachytherapy. At 6 months following treatment, the patient remained without evidence of disease. Conclusion. To our knowledge, this is the first case report of an adenocarcinoma arising from a müllerian cyst. The possibility of malignant transformation should be considered and careful follow-up is warranted even in cases of asymptomatic vaginal cysts.
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