Related Experiment Video
Updated: Jun 20, 2026
Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
Published on: December 15, 2014
[Role of diffusion weighted MR in the diagnosis of parotid tumours]
F Turner1, F Cohen, A Varoquaux
1CHU Timone, Service du Pr. Zanaret, ORL et Chirurgie Cervico-Faciale, Marseille, France. Florence.Turner@ap-hm
Objective:
To evaluate the contribution of sequences of diffusion for the diagnosis of nature of the tumours of the parotid.
Methods:
Retrospective study based on 29 patients all operated of a parotid tumour They had a MRI in conventional acquisition (T1, T1 Gadolinium, T2) and in sequences of diffusion. An ADC cartography (apparent coefficient of diffusion) and an ADC ratio between the tumoral area and the healthy controlateral parotid were successively analyzed by two experienced radiologists. We calculated the effectiveness of these MRI sequences, focusing more particularly on the diagnosis of the malignant tumours. We also determined the sensitivity and the specificity of the sequences of diffusion, with their positive and negative predictive values.
Results:
On the 7 malignant tumours, 3 had been classified wrongly like benign thanks to the only cartography of diffusion. We obtained a sensitivity of this examination for the diagnosis of malignity of 57%. Out of the 22 benign tumours, 1 only was classified wrongly like malignant. The specificity of the diffusion for the diagnosis of malignity thus rose with 95%, its positive predictive value with 80% and its negative predictive value to 87%. It should be noted that all the malignant tumours had an ADC ratio lower or equal to 1.8.
Conclusions:
The histological characteristics of the malignant tumours of the parotid are very variable. Generally, they have large nuclei associated with a hypercellularity involving a decrease of the ADC. The results of this MRI sequence are encouraging even if they remain not very reliable in front of cystic or necrotic tumours.
Insights
Diffusion-weighted MRI shows promise for diagnosing parotid tumors, with high specificity (95%) for malignancy. However, its reliability is limited in cystic or necrotic tumors.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Context:
- Parotid gland tumors present diagnostic challenges.
- Accurate differentiation between benign and malignant parotid tumors is crucial for treatment planning.
Purpose:
- To assess the diagnostic contribution of diffusion-weighted MRI sequences for parotid tumors.
- To evaluate the sensitivity and specificity of diffusion MRI in distinguishing malignant from benign parotid lesions.
Summary:
- Diffusion-weighted MRI, including apparent diffusion coefficient (ADC) mapping and ADC ratio, was analyzed in 29 parotid tumor patients.
- Malignant tumors generally exhibited lower ADC values (≤1.8 ratio).
- Diffusion MRI achieved 57% sensitivity and 95% specificity for malignancy detection.
Impact:
- Diffusion-weighted MRI offers valuable insights into parotid tumor nature.
- The technique shows encouraging results, particularly for identifying malignant characteristics.
- Further refinement is needed for improved accuracy in cystic or necrotic tumor cases.
Related Concept Videos
01:24Magnetic Resonance Imaging
01:17Assessment of Diffusion and Perfusion
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
01:30Radiological Investigation II: MRI and Ventilation Perfusion Scan
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...