Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Oral and maxillofacial radiologyMagnetic resonance imaging (MRI) and dynamic MRI evaluation of extranodal non-Hodgkin lymphoma in oral and maxillofacial regions
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Patients
Twenty-six patients were histopathologically diagnosed with extranodal NHL in our hospital between April 1993 and December 2009. Of these patients, we evaluated the records of 13 who underwent MR examination with or without contrast medium enhancement in this retrospective study. This study was approved by our institutional review board (No. 232). The patients were 5 men and 8 women with a mean age of 66.5 years (age range, 44-79 years) (Table I).
MRI study protocol
The MR examination was performed using a 1.5-T
MR findings (size and characteristics of SI)
The MR findings of all cases are summarized in Table I. The mean greatest dimension of the tumor was 34.2 mm (range: 18-59 mm). On T1WIs, all cases had homogeneous or nearly homogeneous SIs that were hypointense or isointense (Figure 2, Figure 3, A, and 3, A). On T2WIs (n = 9) and STIR images (n = 4), almost all cases had nearly homogeneous SIs that were isointense or hypointense (Figures 2, B, and 3, B). On the CE-T1WIs of 10 cases, almost all cases had (nearly) homogeneous SIs, although the
Discussion
Malignant lymphoma is the second most common malignancy in the head and neck region, although its morbidity rate is not high.38, 39, 40, 41 The occurrence rate of extranodal NHL is reported to be approximately 40%, and the most common site in the head and neck region is Waldeyer's ring.1, 8, 42, 43, 44, 45, 46, 47, 48 Only 3.0% to 9.5% of extranodal NHL arises in the oral region, and its most common sites are the palate and maxilla.1, 2, 3, 4, 5, 6, 7, 42, 44
In the cases of extranodal NHL
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