Evaluation of MR imaging findings differentiating parotid basal cell adenomas from other parotid tumors

Yuriko Murayama, Takeshi Kamitani, Koji Sagiyama, Yuzo Yamasaki, Tomoyuki Hida, Yuko Matsuura, Ryuji Yasumatsu, Hidetaka Yamamoto, Hidetake Yabuuchi, Kousei Ishigami

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Abstract

Purpose: To evaluate the usefulness of magnetic resonance imaging (MRI) to differentiate basal cell adenomas (BCAs) from other parotid tumors. Method: A total of 136 patients with histologically proven parotid gland tumors (13 BCAs, 66 pleomorphic adenomas [PAs], 30 Warthin tumors [WTs], and 27 parotid cancers [PCs]) who underwent a cervical MRI study between December 2011 and March 2019 were retrospectively enrolled. The MRI findings of the tumors were evaluated by two board-certified radiologists. Results: All 13 of the BCAs showed smooth margins, while 19 of the 27 PCs showed irregular margins (p < 0.0001). Eleven BCAs had some cystic components, and five were cyst-dominant. The BCAs had significantly more cystic components than the PAs (p = 0.0077). The mean apparent diffusion coefficient (ADC) value of the BCAs was 1.21 ± 0.20 × 10−3 mm2/sec, which was equivalent to that of the PCs (1.12 ± 0.25 × 10−3 mm2/sec, p = 0.76), significantly lower than that of the PAs (1.61 ± 0.32 × 10−3 mm2/sec, p < 0.0001), and significantly higher than that of the WTs (0.81 ± 0.19 × 10−3 mm2/sec, p = 0.0004). The plateau time-intensity curve (TIC) was the most common type for both BCAs and PCs, seen in 8 of 12 BCAs and 21 of 26 PCs, with no significant difference between these groups (p = 0.34). Conclusions: BCA should be considered a possibility when a parotid lesion has smooth margins with an entire capsule and includes a cystic component, even if the TIC and diffusion-weighted MR images suggest a malignant pattern.

Original languageEnglish
Article number109980
JournalEuropean Journal of Radiology
Volume144
DOIs
Publication statusPublished - Nov 2021

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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