Categorization of Benign Parotid Gland Tumors Based on Dynamic Contrast-enhanced MRI

DOI 参考文献1件
  • Ishida Mariko
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Yoshioka Yuma
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Wakayama Nozomu
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Sekine Kuwon
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Yamaguchi Satoshi
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Kimura Maki
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Matsune Shoji
    Department of Otolaryngology, Nippon Medical School Musashikosugi Hospital
  • Okubo Kimihiro
    Department of Otolaryngology, Head and Neck Surgery, Nippon Medical School Hospital

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To predict the histological type of parotid salivary gland tumors, dynamic-enhanced MRI could be useful. Eight patients with parotid salivary gland tumors were examined preoperatively using gadolinium-enhanced dynamic MRI. The time of peak enhancement (T peak) and washout ratio (WR) were determined from time-signal intensity curves (TSI-curves). According to previous reports, we categorized our 8 patients into four main patterns based on the T peak and WR. Type A (T peak>120 sec) was the pleomorphic type, type B (T peak≦120 sec, WR≧30%) was the Warthin tumor type, type C (T peak≦120 sec, WR<30%) was the malignant tumor type, and type D (flat) was not enhanced. According to the pathological diagnosis, the tumors of patients study comprised four cases of pleomorphic adenomas, two cases of Warthin tumors, one case of sebaceous lymphadenoma and one case of salivary duct cysts. While all four cases of pleomorphic adenoma were categorized into type A, one sebaceous lymphadenoma case, a rare benign salivary gland tumor, was categorized into type B (pattern of Warthin tumors). We obtained basically the same result as previous reports on categorization. On that basis, we were able to examine the histological type of sebaceous lymphadenomas using dynamic contrast-enhanced MRI.

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