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Salivary gland tumors of the parotid gland: CT and MR imaging findings with emphasis on intratumoral cystic components

  • Head and Neck Radiology
  • Published:
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Abstract

Introduction

The purpose of this study was to assess computed tomography (CT) and magnetic resonance (MR) imaging findings of salivary gland tumors of the parotid gland with emphasis on intratumoral cystic components.

Methods

Seventy-two histopathologically confirmed salivary gland tumors of the parotid gland (44 benign and 28 malignant), which underwent both CT and MR imaging including contrast-enhanced study, were included in this study. We retrospectively reviewed images for the presence, number, occupying rate, margin characteristics, distribution, and predominant MR signal intensity of intratumoral cystic components.

Results

The prevalence of cystic components was greater in malignant than benign tumors (79 vs. 50 %, p < 0.05). The number and occupying rate were similar between benign and malignant tumors. The irregular margins were more frequent in malignant than benign tumors (73 vs. 27 %, p < 0.01). The frequency of eccentric location was greater in benign than malignant tumors (91 vs. 55 %, p < 0.01), whereas the frequency of centric location was greater in malignant than benign tumors (32 vs. 0 %, p < 0.01). On T1-weighted images, the frequency of hyperintensity was greater in benign than malignant tumors (50 vs. 9 %, p < 0.01), whereas that of isointensity was greater in malignant than benign tumors (50 vs. 0 %, p < 0.01). Multiple logistic regression analysis showed that the absence of irregular margins of cystic components only was significantly correlated with the presence of benign salivary gland tumors (p < 0.01).

Conclusion

Imaging features of intratumoral cystic components may help to differentiate benign from malignant tumors of the parotid salivary gland.

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Ethical standards and patient consent

We declare that all human and animal studies have been approved by the local ethics committee and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. We declare that all patients gave informed consent prior to inclusion in this study.

Conflict of interest

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Department of Radiology, Gifu University School of Medicine, 1-1 Yanagido, Gifu, 501-1194, Japan

    Hiroki Kato, Masayuki Kanematsu & Haruo Watanabe

  2. High-Level Imaging Diagnosis Center, Gifu University Hospital, Gifu, Japan

    Masayuki Kanematsu

  3. Department of Otolaryngology, Gifu University School of Medicine, Gifu, Japan

    Keisuke Mizuta & Mitsuhiro Aoki

Authors
  1. Hiroki Kato
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  2. Masayuki Kanematsu
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  3. Haruo Watanabe
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  4. Keisuke Mizuta
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  5. Mitsuhiro Aoki
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Corresponding author

Correspondence to Masayuki Kanematsu.

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Kato, H., Kanematsu, M., Watanabe, H. et al. Salivary gland tumors of the parotid gland: CT and MR imaging findings with emphasis on intratumoral cystic components. Neuroradiology 56, 789–795 (2014). https://doi.org/10.1007/s00234-014-1386-3

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  • DOI: https://doi.org/10.1007/s00234-014-1386-3

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