Abstract
A case of minor omental cyst discovered by an abnormal shadow of the mediastinum in a chest X-ray film is repoted. A 52-year-old man was pointed out an abnormal shadow of the mediastinum in a chest X-ray film on mass screeing, and was admitted to the hospital for minute examination. CT and angiography indicated a hernia of a minor omental cyst to the mediastinum. Operation was done by thoracotomy and laparotomy. In laparotomy, a 10×6 cm cyst in minor omentum was shown to slide into the mediastinum through the esophageal fissure. After removing the cyst, Nissen's fundplication was performed to prevent postoperative hernia of esophageal fissure. In histological findings, the cyst was lymphangioma but no malignant sign was shown. There was no problem in the postoperative course.
