What value is given to MRI diffusion and perfusion sequences in the diagnosis of parotid tumors? Is a fine needle aspiration associated with MRI systematically necessary? The aim of the research is to study the performance of diffusion and perfusion MRI sequences in the diagnosis of parotid tumors on a large series of cases.

Inclusion criteria:

• Major subject (≥18 years old)
• Minor subject (<18 years old)
• Operated for a parotid tumor at Strasbourg University Hospital between January 2009 and June 2020
• Having had in the preoperative assessment an MRI of the parotid, also carried out at the Strasbourg University Hospital.
• Subject (and / or his parental authority) not having expressed, after being informed, his opposition to the reuse of his data for the purposes of this research.

Exclusion criteria:

• Subject (or his parents) who expressed his (their) opposition to participating in the study
• Lack of pathological or MRi results
• Subject under guardianship, curatorship or safeguard of justice

Minor and major subjects operated for a parotid tumor at Strasbourg University Hospital between January 2009 and June 2020 and having had in the preoperative assessment an MRI of the parotid, also carried out at the Strasbourg University Hospital.