Clinical difference between benign and malignant tumors of the hard palate

Dermoid Cyst of the Hard Palate: Case Report and Review of the Literature

Dermoid and epidermoid cysts are congenital or acquired benign developmental cysts that uncommonly occur in the head and neck region. These cysts represent less than 0.01% of all cysts of the oral cavity and can be found on the tongue, lips and other oral mucosa locations. The palate is less frequently affected with most reported cysts being limited to the soft palate. In this study, we report a case of a dermoid cyst of the hard palate, and discuss its management with a review of the literature.

Effective combination of 3 imaging modalities in differentiating between malignant and benign palatal lesions

OBJECTIVE

The aim of this study was to evaluate whether computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography/computed tomography (PET/CT) can effectively differentiate between malignant and benign palatal lesions.

STUDY DESIGN

In total, 59 patients with palatal lesions (32 malignant and 27 benign), who underwent CT, MRI, and/or PET/CT imaging examinations and had histopathological diagnoses, were divided into an analysis group (n = 46) and a validation group (n = 13). Bone changes adjacent to the lesion, MRI signal intensity, apparent diffusion coefficient (ADC), time to peak enhancement (T_peak), and maximum standardized uptake values (SUV_max) were evaluated in the analysis group. Diagnostic performance was individually assessed for each parameter for differentiating between malignant and benign lesions. A diagnostic decision tree was constructed by using useful parameters and its accuracy tested in the validation group.

RESULTS

The frequency distribution of bone change types and T_peak differed significantly between malignant and benign lesions. The ADC of malignant lymphoma was significantly lower than that of other lesions. The other parameters did not distinguish between lesion types. The accuracy of the decision tree, constructed by using bone change types, ADC, and T_peak, was 87.5%.

CONCLUSIONS

Bone change types, ADC values, and T_peak are useful for differentiating between malignant and benign palatal lesions.