title: Spontaneous regression of bronchogenic cyst accompanied by pneumonia.
abstract: Bronchogenic cysts arise from abnormal budding of the ventral diverticulum of the foregut or tracheobronchial tree during embryogenesis, are the most common cystic masses in the mediastinum, and are generally asymptomatic. A spontaneous regression in a mediastinal bronchogenic cyst (MBC) with pneumonia is rare. A 30-year-old male had a tumor shadow in the middle mediastinum. When he visited our hospital, he had a mild fever with coughing and sputum. A chest computed tomography (CT) scan showed a decrease in the tumor size and the existence of right pneumonia. MBC may be involved in the etiology of pneumonia; therefore, bronchogenic cysts need to be resected as soon as possible.
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. himuro0824@med.showa-u.ac.jp.
authors.forename: Naoya
authors.initials: N
authors.lastname: Himuro
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. nrc549600@yahoo.co.jp.
authors.forename: Takao
authors.initials: T
authors.lastname: Minakata
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. y_oshima@med.showa-u.ac.jp.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oshima
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. dkataoka@med.showa-u.ac.jp.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kataoka
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. Shigeru@med.showa-u.ac.jp.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Yamamoto
authors.affiliation: Division of Chest Surgery, Department of Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. kadokura@med.showa-u.ac.jp.
authors.forename: Mitsutaka
authors.initials: M
authors.lastname: Kadokura
keywords: Bronchogenic cyst; Mediastinal tumor; Pneumonia; Spontaneous regression