title: Intraoral Salivary Duct Cyst: Clinical and Histopathologic Features of 177 Cases.
abstract: The salivary duct cyst (SDC) is a reactive ductal ectasia most frequently seen in major salivary glands, and likely caused by obstruction. The aim of this study is to define the clinical and histopathologic spectrum of intraoral SDCs. Cases were retrieved from the archives of Harvard School of Dental Medicine/StrataDx, Inc. from January 2012 to August 2014. There were 177 cases of which 103 (58.2%) occurred in females, with a median age of 56 (range 2-95). Approximately half of cases (45.8%) presented in the area of the buccal mucosa, lower lip mucosa, or mandibular vestibule, and 23.2% presented in the floor of mouth. SDCs were lined at least focally by 1-2 layers of cuboidal/columnar epithelium in 85.3% of cases and showed varying degrees of metaplasia (oncocytic, mucous cell, squamous, ciliated, apocrine-like) in 68.4% of cases. Intraluminal mucous stasis was present in 41.8% of SDCs, incipient calcification was present within 4.5% of SDCs, and chronic obstructive sialadenitis was seen in 90.2% of cases. No cysts showed adenomatous ductal proliferations or true papillary structures with fibrovascular cores, although 41.2% exhibited reactive undulation of cyst lining. Thirty-nine 'papillary oncocytic cystadenoma-like' SDCs (22.0%) demonstrated complete oncocytic metaplasia and marked undulation. An additional seven such cysts (4.0%) had a 'Warthin tumor-like' lymphoplasmacytic infiltrate. Intraoral SDCs occur most commonly in the sixth decade of life in locations distinct from extravasation mucoceles, likely secondary to intraluminal obstruction. SDCs show diverse histopathology and certain phenotypic variants may be mistaken for papillary oncocytic cystadenoma or Warthin tumor.
authors.affiliation: Department of Oral and Maxillofacial Medicine and Diagnostic Sciences, Case Western Reserve University School of Dental Medicine, Cleveland, OH, 44106, USA. ivan.stojanov@case.edu.|Department of Pathology, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH, 44106, USA. ivan.stojanov@case.edu.
authors.forename: Ivan J
authors.initials: IJ
authors.lastname: Stojanov
authors.affiliation: Center for Oral Pathology, StrataDx Inc., Lexington, MA, 02421, USA.
authors.forename: Umer A
authors.initials: UA
authors.lastname: Malik
authors.affiliation: Center for Oral Pathology, StrataDx Inc., Lexington, MA, 02421, USA.|Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, 02115, USA.
authors.forename: Sook-Bin
authors.initials: SB
authors.lastname: Woo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003560:Cysts / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018987:Salivary Ducts / Q000473:pathology*; D012466:Salivary Gland Diseases / Q000473:pathology*; D055815:Young Adult
keywords: Cystadenoma; Mucocele; Mucous retention cyst; Salivary duct cyst; Sialocyst; Warthin tumor