title: Endometrial stromal sarcoma presented as an incidental lung mass with multiple pulmonary nodules.
abstract: Low-grade endometrial stromal sarcoma (ESS) is an uncommon gynecologic malignancy of mesodermal origin. Pulmonary metastasis of low-grade ESS can occur years and decades after the treatment of the primary disease. Low-grade ESS is frequently mistaken as benign uterine neoplasm like uterine leiomyoma, which can potentially lead to a misdiagnosis. We present a case of a 42-year-old woman with low-grade ESS, that initially presented as an incidental lung mass with multiple pulmonary nodules, seven years after an uterine myomectomy. A 6.9×5.8 cm-sized intrapelvic mass suspected of uterine origin was discovered while searching for potential extrathoracic primary origin. A pelviscopy and simultaneous thoracoscopic lung biopsy were conducted for pathologic diagnosis. Finally, the diagnosis was confirmed as low-grade ESS with lung metastasis based on the histopathologic examination with immunohistochemical stain, which was showed positive for CD10 and hormone receptor markers (estrogen and progesterone receptors) in both pelvic and lung specimens.
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Dong Oh
authors.initials: DO
authors.lastname: Kang
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Sue In
authors.initials: SI
authors.lastname: Choi
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Jee Youn
authors.initials: JY
authors.lastname: Oh
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Jae Kyeom
authors.initials: JK
authors.lastname: Sim
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Choi
authors.affiliation: Department of Radiology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Ji Yung
authors.initials: JY
authors.lastname: Choo
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Jin Wook
authors.initials: JW
authors.lastname: Hwang
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Seung Heon
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Pathology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Ju-Han
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Radiology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Ki Yeol
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Chol
authors.initials: C
authors.lastname: Shin
authors.affiliation: Division of Pulmonology, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
authors.forename: Je Hyeong
authors.initials: JH
authors.lastname: Kim
keywords: Multiple Pulmonary Nodules; Neoplasm Metastasis; Sarcoma, Endometrial Stromal
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