Capsule of parotid gland tumor: evaluation by 3.0 T magnetic resonance imaging using surface coils
| Autor: | Mana Ishibashi, Kazuhiko Kodani, Toshio Kaminou, Toshihide Ogawa, Keisuke Nishihara, Shinya Fujii, Katsuyuki Kawamoto, Eiji Matsusue |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Adult
Male Pathology medicine.medical_specialty Contrast enhancement Adenoma Adenoma Pleomorphic Contrast Media Gadolinium Sensitivity and Specificity Young Adult stomatognathic system Heterocyclic Compounds Carcinoma medicine Organometallic Compounds Humans Parotid Gland Radiology Nuclear Medicine and imaging Aged Aged 80 and over Observer Variation Radiological and Ultrasound Technology Salivary gland medicine.diagnostic_test business.industry Capsule Reproducibility of Results Magnetic resonance imaging General Medicine Middle Aged medicine.disease Adenolymphoma Image Enhancement Carcinoma Adenoid Cystic Magnetic Resonance Imaging Parotid gland Parotid Neoplasms medicine.anatomical_structure Coronal plane Female Nuclear medicine business |
| Zdroj: | Acta radiologica (Stockholm, Sweden : 1987). 51(10) |
| ISSN: | 1600-0455 |
| Popis: | Background: Magnetic resonance (MR) imaging of parotid gland tumors has been widely reported, although few reports have evaluated the capsule of parotid gland tumors in detail. Purpose: To evaluate the diagnostic usefulness of 3.0 T MR imaging with surface coils for detection of the parotid gland tumor capsule, and to clarify the characteristics of the capsules. Material and Methods: Seventy-eight patients with parotid gland tumors (63 benign and 15 malignant) were evaluated. Axial and coronal T2-weighted and contrast-enhanced T1-weighted images were obtained using a 3.0 T MR scanner with 70 mm surface coils. It was retrospectively assessed whether each parotid gland tumor was completely surrounded by a capsule. The capsule was classified as regular or irregular in terms of capsular thickness, and as none, mildly, or strongly enhancing in terms of contrast enhancement. Visual interpretations were compared with histopathological findings to evaluate the diagnostic ability of MR imaging to detect parotid gland tumor capsules. Statistical evaluation was conducted concerning the presence of capsules, capsular irregularity, and the difference in contrast enhancement between benign and malignant tumors, and that between pleomorphic adenomas and Warthin's tumors. Results: Capsules completely surrounding the tumor on MR imaging yielded a sensitivity of 87.7% (50/57), specificity of 90.5% (19/21), and accuracy of 88.5% (69/78). Benign tumors had a capsule completely surrounding the tumor significantly more often than malignant tumors ( P = 0.009). Concerning capsular irregularity, malignant tumors tended to have more irregular capsules than benign tumors, although there were no significant differences. The capsules of malignant tumors enhanced significantly more strongly than those of benign tumors ( P = 0.018). Conclusion: 3.0 T MR imaging using surface coils could correctly depict parotid gland tumor capsules in most cases. Most benign and some malignant tumors had capsules completely surrounding the tumors. Malignancy should be considered in tumors with irregular and strongly enhancing capsules. |
| Databáze: | OpenAIRE |
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