ACCs arise more commonly in the minor salivary glands (~55%) than in the major salivary glands. They are locally aggressive with propensity for perineural spread 5.
Generally, a distinction is made radiologically between low-grade and high-grade adenoid cystic carcinomas. Low-grade tend to be well-defined malignancies as opposed to high-grade ACCs who appear infiltrative. However, both subtypes are usually homogeneously enhancing after contrast administration.
- T1: hypo- to isointense
- T2: slightly hyperintense, with higher grades being markedly hyperintense
- T1 C+ (Gd): homogeneous enhancement
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