title: Epithelial-myoepithelial carcinoma of the parotid gland, unusual malignancy radiologically simulating a benign lesion: case report.
abstract: BACKGROUND
  Ultrasound (US), Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) are widely used in the clinical diagnosis of parotid gland tumors and their efficacy in identifying benign lesions is well documented. However, problems arise when facing some malignant lesions. Only few cases of salivary gland low grade malignant tumors have been previously reported in the literature complete with the radiological features.
  
  
  METHODS
  We here describe a case of epithelial-myoepithelial carcinoma (EMC) of the parotid gland, a low grade malignant tumor, with spread to an intraparotid lymph node and with CT and MRI findings mimicking a benign lesion.
  
  
  CONCLUSIONS
  All the images revealed sharply outlined profiles and a homogeneous enhancement of the nodule, suggesting a benign tumor and demonstrating that a radiological evaluation of the lesion alone may be unsatisfactory and misleading in the diagnosis of salivary gland tumours, especially in the case of low grade malignant tumors, such as EMC.
authors.affiliation: Department of Pathology, National Institute for Infectious Diseases "L, Spallanzani" IRCCS, Rome, Italy. licci@inmi.it.
authors.forename: Irene
authors.initials: I
authors.lastname: Piscioli
authors.forename: Luca
authors.initials: L
authors.lastname: Morelli
authors.forename: Andrea
authors.initials: A
authors.lastname: Falzone
authors.forename: Franca
authors.initials: F
authors.lastname: Del Nonno
authors.forename: Marinella
authors.initials: M
authors.lastname: Neri
authors.forename: Zorika Christiana
authors.initials: ZC
authors.lastname: Di Rocco
authors.forename: Alessia
authors.initials: A
authors.lastname: Catalucci
authors.forename: Salvatore
authors.initials: S
authors.lastname: Donato
authors.forename: Stefano
authors.initials: S
authors.lastname: Licci