Adenoid cystic carcinoma of the salivary glands

Adenoid cystic carcinoma (ACC) of the salivary glands is the most common malignancy involving the minor salivary glands and the second most common malignancy involving the parotid gland.

Adenoid cystic carcinomas arise more commonly in the minor salivary glands (~55%) than in the major salivary glands. They are locally aggressive with a propensity for perineural spread 5

CT

Generally, a distinction is made radiologically between low-grade and high-grade adenoid cystic carcinomas. Low-grade tumours tend to be well-defined, in contradistinction to high-grade tumours, which appear infiltrative. However, both subtypes are usually homogeneously enhancing after contrast administration.

Adenoid cystic carcinomas are frequently associated with perineural spread (via cranial nerve VII), which is well appreciated on MRI.

MRI
Signal characteristics
  • T1: hypo- to isointense
  • T2: slightly hyperintense, with higher grades being markedly hyperintense
  • T1 C+ (Gd): homogeneous enhancement
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Article information

rID: 20129
Tag: cases
Synonyms or Alternate Spellings:
  • Adenoid cystic carcinoma of salivary glands
  • Adenocystic carcinoma of the parotid
  • Adenocystic carcinoma of the salivary glands
  • Adenoid cystic carcinoma of the salivary glands

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Cases and figures

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    Fig 1: frequency table of salivary glands tumours
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    Case 1
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