Myoepithelioma Arising in the Buccal Mucosa: A Case Report and Review of the Literature.

Although myoepithelioma is defined as a benign tumour made up primarily of neoplastic myoepithelial cells, its actual histopathological characteristics are highly diverse. It can be considered a rare disease. The most common site of occurrence is the parotid gland, followed by the minor salivary glands of the palate.

Bilateral Parotid Gland Oncocytoma Mimicking Oropharyngeal Cancer Metastasis: A Case Report from a Radiation Oncologist's Perspective.

Background/aim: Parotid oncocytomas typically present as benign, unilateral, slow-growing, painless, and solitary masses that are histologically firm and multilobulated. They are often misdiagnosed as pleomorphic adenomas, hemangiomas, or other forms of oncocytosis. However, in our case, the parotid oncocytomas initially mimicked bilateral parotid gland metastasis of advanced oropharyngeal cancer.

Assessment of synthetic MRI to distinguish Warthin's tumor from pleomorphic adenoma in the parotid gland: comparison of two methods of positioning the region of interest for synthetic relaxometry measurement.

Purpose: To assess the diagnostic potential of the synthetic MRI (SyMRI) for differentiating Warthin's tumors (WT) from pleomorphic adenomas (PA).

Materials And Methods: Forty-nine individuals with parotid gland tumors (PA, n = 23; WT, n = 26) were recruited. Using two distinct regions of interest (ROI), SyMRI quantitative parameters of lesions were calculated, including mean and standard deviation (T1, T2, PD, T1sd, T2sd, and PDsd).

Subcutaneous Pleomorphic Adenoma in an Accessory Parotid Gland in the Cheek.

The accessory parotid gland (APG) is a distinct salivary tissue in the cheek that is located on the masseter muscle and is separate from the main parotid gland. APG tumors (APGTs) are rare. Due to aesthetic reasons and the risk of both malignancy and recurrence, APGTs are best treated with surgical resection.

Clinical and Morphological Aspects of Aggressive Salivary Gland Mixed Tumors: A Narrative Review.

Salivary gland tumors are a rare and heterogeneous group of neoplasms of the head and neck region. The mixed category of these tumors include the following entities: pleomorphic adenoma (PA), carcinoma ex pleomorphic adenoma (CEPA), salivary carcinosarcoma (CS), and metastasizing PA (MPA). The most common benign tumor of the salivary glands is PA.

Diagnostic performance of MRI-based radiomics models using machine learning approaches for the triple classification of parotid tumors.

Rationale And Objectives: Preoperative differentiation of malignant tumors (MT), pleomorphic adenomas (PA), and other benign tumors of the parotid gland is critical to clinical strategy, this study aimed to develop and validate a T2-weighted image (T2WI) based radiomics model through machine learning approaches for the triple classification of parotid gland tumors.

Materials And Methods: We retrospectively enrolled 147 patients from January 2010 to July 2022. T2WIs were used to extract radiomics features.

Novel Detection of Pleomorphic Adenomas via Analysis of Ga-DOTATOC PET/CT Imaging.

Introduction: Currently, the diagnosis of salivary gland tumors using imaging techniques is unreliable.

Methods: In this monocentric retrospective study, we examined patients who received a Ga-DOTATOC PET/CT and subsequently underwent a salivary gland tumor resection between 1 January 2010 and 31 December 2021. PET/CT image assessment was compared with somatostatin receptor (SSTR) expression and histology.

Evaluation of multiparametric MRI differentiating pleomorphic adenoma from schwannoma in parapharyngeal space.

Purpose: This study aimed to investigate whether multiparametric magnetic resonance imaging (MRI) including dynamic contrast-enhanced (DCE) and diffusion weighted (DW) MRI can differentiate pleomorphic adenoma (PA) from schwannoma in the parapharyngeal space.

Methods: Forty-six patients with pathologically proven PAs and 47 schwannomas in the parapharyngeal space were enrolled. All patients underwent conventional MRI, and DW-MRI and DCE-MRI were performed in 30 and 33 patients, respectively.

Carcinoma ex-pleomorphic adenoma of parotid gland presenting as a gigantic cervicofacial mass.

When neglected for a long time, salivary gland pleomorphic adenoma (PA) can attain a considerable size, increasing the patient's morbidity along with the risk of malignant transformation. Very few case reports are available describing PA of the parotid glands presenting as a large cervicofacial mass. We report a case of epithelial myoepithelial carcinoma -a rare subtype of carcinoma ex-PA (Ca-Ex-PA) of non-luminal differentiation, that developed over a long period in a primary PA of the parotid gland and presented as a giant cervicofacial mass.

Different MRI-based radiomics models for differentiating misdiagnosed or ambiguous pleomorphic adenoma and Warthin tumor of the parotid gland: a multicenter study.

Purpose: To evaluate the effectiveness of MRI-based radiomics models in distinguishing between Warthin tumors (WT) and misdiagnosed or ambiguous pleomorphic adenoma (PA).

Methods: Data of patients with PA and WT from two centers were collected. MR images were used to extract radiomic features.

Predicting High-risk Capsular Features in Pleomorphic Adenoma of the Parotid Gland Through a Nomogram Model Based on ADC Imaging.

Rationale And Objectives: Based on Apparent Diffusion Coefficient (ADC) images, a nomogram model is established to accurately predict the high-risk capsular characteristics associated with pleomorphic adenoma of the parotid gland (PAP) recurrence.

Materials And Methods: This retrospective study analyzed 190 patients with PAPs. Significant clinical radiological factors were identified through univariate difference analysis and multivariate regression analysis.

Primary malignant melanoma of the parotid gland, a rare case arising from a duct: a case report and literature review.

Malignant melanoma of the parotid gland is an unusual tumor in the head and neck region, and most parotid melanoma is reported as a metastatic lesion of cutaneous malignant melanoma. We report a case of primary malignant melanoma arising in the parotid gland duct with diagnostic challenge. The patient was a 68-year-old man who complained of repeated right facial swelling that presented 3 months prior.

Parotidectomy for deep lobe pleomorphic adenomas is associated with higher rates of complications and recurrence.

Background: Pleomorphic adenoma (PA) is a common parotid tumor, yet due to the relative rarity of deep lobe PA (DLPA), there is a paucity of information about its clinical presentation and surgical outcomes.

Methods: We reviewed the charts of patients with previously untreated parotid PA between the years 1990 and 2015. Clinical parameters and surgical outcomes were compared between superficial lobe PA (SLPA) and DLPA.

Multispectral optoacoustic tomography of benign parotid tumors in vivo: a prospective observational pilot study.

Parotid lumps are a heterogeneous group of mainly benign but also malignant tumors. Preoperative imaging does not allow a differentiation between tumor types. Multispectral optoacoustic tomography (MSOT) may improve the preoperative diagnostics.

Correlation between MRI (DWI and DCE) and cellularity of parotid gland pleomorphic adenomas.

Purpose: Parotid pleomorphic adenomas present a risk of recurrence, higher when the tumour is a hypocellular subtype. The aim of the study was to determine whether it is possible to characterize this histological subtype with diffusion and perfusion sequences of the preoperative MRI.

Methods: This retrospective study included 97 patients operated between 2010 and 2020.