Basal cell adenomas are uncommon salivary gland tumors, representing ~4% (range 1-7.5%) of benign parotid tumors. They can also occur in the other major salivary glands as well as the minor salivary glands.
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Clinical presentation
Most commonly, a painless growing mass 1.
Pathology
Typically, basal cell adenomas are unilateral, round/oval and <3 cm 1.
Radiographic features
Imaging features are similar to pleomorphic adenomas, although basal cell adenomas are more likely to have smooth margins compared to the undulating margins typical of pleomorphic adenomas >1 cm in size 2.
MRI
ADC values are typically lower in basal cell adenomas compared to pleomorphic adenomas (1.24 vs 1.86 10−3 mm2 s−1 in one study 1) and they appear slightly more cystic 1.
Complications
Basal cell adenoma can degenerative into basal cell adenocarcinoma, although these are reported to more commonly arise de novo 2.
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