title: Rapidly growing glandular papilloma associated with mucus production: a case report.
abstract: BACKGROUND
  Pulmonary glandular papillomas are rare neoplasms, and their very slow or absent growth over time generally facilitates establishing the diagnosis.
  
  
  METHODS
  In an 84-year-old woman who underwent surgery for sigmoid colon cancer, a growing solitary pulmonary nodule was identified on postoperative follow-up computed tomography. A computer tomography-guided needle biopsy was performed under suspicion that the nodule was malignant. The histopathological findings suggested a glandular papilloma. Right basilar segmentectomy was carried out, and the lesion was completely resected. Postoperative histopathological examination revealed a benign glandular papilloma accompanied by mucus retention in the surrounding alveolar region.
  
  
  CONCLUSIONS
  A malignant neoplasm is usually suspected when a pulmonary tumor shows rapid growth. However, glandular papillomas associated with mucus retention also tend to grow in some cases, and should be included in the differential diagnosis.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Division of General Thoracic Surgery, Department of Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku Tokyo 160-8582, Japan. taichiro@1997.jukuin.keio.ac.jp.
authors.forename: Taichiro
authors.initials: T
authors.lastname: Goto
authors.forename: Katsura
authors.initials: K
authors.lastname: Emoto
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D000369:Aged, 80 and over; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology*; D009093:Mucus / Q000378:metabolism*; D009375:Neoplasms, Glandular and Epithelial / Q000378:metabolism / Q000473:pathology*; D010212:Papilloma / Q000378:metabolism / Q000473:pathology*; D011379:Prognosis; D003074:Solitary Pulmonary Nodule / Q000378:metabolism / Q000473:pathology*; D014057:Tomography, X-Ray Computed