CT features of basal cell adenoma in the parotid gland

Objective: To review CT features of basal cell adenoma in the parotid gland. Methods: The clinical records and CT of 22 patients with pathologically confirmed basal cell adenomas in the parotid glands were reviewed. Results: The 22 solitary masses were were situated in the superficial (19), both superficial and deep (2), or in the-deep (1) lobes of the parotid glands. The lesions were round (16) or lobulated (6) with well-defined margins. The diameter was 1.1-4.3 cm, with 3 lesions > 3.0 cm. The mass was uniform in density (5), had cystic change (17), or calcification (2) with solid components isodense relative to muscle. Contrast enhancement > 40 HU with mild washout in the venous phase was noted in 15 lesions. Progressive enhancement < 40 HU was observed in the remaining 7 lesions. Conclusion: CT features of basal cell adenoma in the parotid gland include solitary mass in the superficial lobe with cystic areas, > 40 HU contrast enhancement in the arterial phase, and mild washout in the venous phase. (authors)