Study of the Facial Nerve in MRI 3T in the Preoperative Assessment of Parotid Tumors

Study of the Facial Nerve in MRI 3T in the Preoperative Assessment of Parotid Tumors

Preoperative evaluation of the precise localization of the intrapartotic facial nerve is essential for the ENT surgeon to assess the risk of nerve damage during parotid tumor excision, and inform the patient of the risk of post-paralyzed facial nerve palsy. procedure

1. st visit: Inclusion, parotid MRI 3Tesla high resolution with specific sequences and gadolinium injection performed at the A. de Rothschild Foundation. Evaluation by two radiologists of the exact position of the parotid tumor with respect to the trunk of the facial nerve and its first branches, classified into two categories: contact (≤ 5 mm) or distance (> 5 mm).
2. nd visit: Surgical intervention of the parotid tumor. The surgeon will specify the same data as those collected by the radiologists after the MRI. The surgeon will not be aware of the data concerning the ratios of parotid tumor to facial nerve collected on MRI sequences for research purposes.

Inclusion Criteria:

• Patient over 18 years old
• Patient seeking first-line surgery for a parotid tumor (single or multiple, benign or malignant)
• Parotidian tumor located near the trunk of the facial nerve and / or its first division branches (temporofacial and cervicofacial), during a clinical evaluation performed by the surgeon in preoperative consultation
• Patient affiliated or beneficiary of a social security scheme
• Written consent to participate in the study

Exclusion Criteria:

• Personal history of ipsilateral parotid surgery
• Contraindication to MRI (electronic device, metallic foreign body, claustrophobia)
• Known hypersensitivity to gadolinium contrast agents
• Renal impairment known: glomerular filtration rate <30 mL / min
• Pre or post-operative period of liver transplantation
• Patient benefiting from a legal protection measure
• Pregnant or lactating woman