title: [Parotid basal cell adenoma of membranous type].
abstract: BACKGROUND
  Basal cell adenoma (BCA) is a rare benign neoplasm characterized by the basaloid appearance of the tumour cells and the lack of myxo-chondroid stromal component present in pleomorphic adenoma.
  
  
  OBJECTIVE
  We report a case of basal cell adenoma of membranous type, highly suspected of malignancy because of the presence of mediastinal lymph nodes and pulmonary nodules which finally were related to an associated sarcoidosis.
  
  
  METHODS
  Our patient was an 80-year-old woman who presented a swelling of the right parotid two years ago. The clinical examination revealed a solid, indolent and mobile mass. A chest radiography noted mediastinal lymph nodes. The CT-scan confirmed the presence of mediastinal and tracheal lymph nodes with pulmonary nodules. So the diagnosis of metastatic malignant salivary gland tumor was suspected. Finally, the histological examination concluded to a basal cell adenoma of membranous type with sarcoidosis granulomas in the parotid and in the lymph nodes.
  
  
  CONCLUSIONS
  The BCA is a benign tumor located generally in the parotid gland. When the malignancy is suspected, like in our case, this tumor must be differentiated from the basal cell adenocarcinoma using histological criteria.
authors.affiliation: Laboratoire d'Anatomie et de Cytologie Pathologiques, Hôpital Charles Nicolle, Tunis, Tunisie.
authors.forename: Faten
authors.initials: F
authors.lastname: Farah-Klibi
authors.forename: Malek
authors.initials: M
authors.lastname: Ferchiou
authors.forename: Jihène
authors.initials: J
authors.lastname: Kourda
authors.forename: Olfa
authors.initials: O
authors.lastname: El Amine
authors.forename: Mohamed
authors.initials: M
authors.lastname: Ferjaoui
authors.forename: Sarrah
authors.initials: S
authors.lastname: Ben Jilani
authors.forename: Rachida
authors.initials: R
authors.lastname: Zermani
mesh_terms: D000236:Adenoma / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D000369:Aged, 80 and over; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008482:Mediastinum / Q000000981:diagnostic imaging; D010307:Parotid Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D011859:Radiography; D012507:Sarcoidosis / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D016896:Treatment Outcome