title: [Unilateral multiple tumorous lesions of the parotid gland].
abstract: Multifocal tumors within the same parotid gland are very rare. We treated 13 patients with multiple tumorous lesions within the unilateral parotid gland. We evaluated the multiple nodules by CT-sialography or magnetic resonance imaging (MRI). These imagings showed clearly two or more distinct nodular-appearing lesions. Recurrent pleomorphic adenoma (6 patients) was predominant, followed by Whartin's tumor (3 patients). The other lesions were two differential parenchymal tumors (polymorphous low grade adenoma/adenoma) within the same gland, a malignant lymphoma, a squamous cell carcinoma metastatic to the gland, and a tuberculous lesion. On palpitation, 9 of the patients had an unilateral tumor, one a palpable parotid mass in the gland, and the other four had two or more tumors in the unilateral gland. The patients with intra-parotid lymph node and metastatic lesions had extra-parotid cervical adenopathy. The clinical features and the differential diagnosis of the unilateral multiple tumorous lesions of the parotid gland are discussed.
authors.affiliation: Department of Otolaryngology, Asahikawa Medical School.
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.forename: T
authors.initials: T
authors.lastname: Adachi
authors.forename: K
authors.initials: K
authors.lastname: Enomoto
authors.forename: H
authors.initials: H
authors.lastname: Ishii
authors.forename: C
authors.initials: C
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Hokunan
authors.forename: N
authors.initials: N
authors.lastname: Bando
authors.forename: H
authors.initials: H
authors.lastname: Shigyo
mesh_terms: D000235:Adenolymphoma / Q000000981:diagnostic imaging; D008949:Adenoma, Pleomorphic / Q000175:diagnosis / Q000473:pathology; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010307:Parotid Neoplasms / Q000175:diagnosis / Q000473:pathology*; D014057:Tomography, X-Ray Computed