Dynamic MR imaging in the head and neck.

Abstract

Although use of dynamic MR imaging contributes little in predicting malignancy in head and neck lesions, it can limit the differential diagnosis and has potential in predicting vascularity and recurrence.

Application of dynamic contrast-enhanced MRI to differentiate malignant lymphoma from squamous cell carcinoma in the head and neck

“…It has been reported that dynamic contrast-enhanced MRI (DCE-MRI) is useful for the differential diagnosis of some tumors, and many investigators have attempted to use it to identify differences between benign and malignant tumors, as well as to assess the malignancy of tumors [3][4][5][6]. We have also reported the usefulness of DCE-MRI for tumor diagnosis [7][8][9].…”

Dynamic MR Imaging and Radiotherapy

“…However, these MRIˆndings for various disorders overlap considerably and MR is unable to establish tumor characterization. [1][2][3][4][5][6][7][8] A biopsy is still required to obtain histological diagnosis.…”

“…[1][2][3][4][5][6][7] The contrast between a tumor and normal tissue is maximized in the early dynamic phase. Usually, malignant lesions show early enhancement within 90 seconds, and are washed out earlier than normal tissue.…”

An algorithm for preoperative differential diagnostics of parotid tumours on the basis of their dynamic and diffusion-weighted magnetic resonance images: a retrospective analysis of 158 cases

“…However, further research on the cut-off values for T peak and WR providing maximum accuracy in the differential diagnostics of these three groups produced conflicting results. While there is a consensus with regards to the cut-off values for T peak and WR that accurately distinguish parotid malignancies from Warthin tumours (T peak = 60 s and WR = 30%) [9,18,20,21], the differential diagnostics of pleomorphic adenomas and malignant lesions is still a challenge. Clinical experience suggests that the previously proposed cut-off values for T peak (120, 210 or 240 s) and WR (10%) [9,18,20,21] are not accurate enough to distinguish malignant tumours from pleomorphic adenomas.…”

“…The time intensity curves (TICs) for two most common histological types of benign parotid lesions, pleomorphic adenomas and Warthin tumours, differ from those for parotid malignancies [1,[7][8][9][10][11][12][13]19]. A few studies applying this knowledge in differential diagnostics of parotid tumours produced promising results [18,20,21]. However, this evidence, originating from relatively small studies of patients with pleomorphic adenomas, Warthin tumours and parotid malignancies, was not confirmed in routine clinical practice [5].…”