A comparison of the results of histopathological and enhanced CT examinations were carried out for 88 patients with oral squamous cell carcinomas who underwent neck dissection. CT scanning (5-mm thick section) images obtained during bolus/drip injection of Iopamidol were routinely taken through the neck.
Ninety-two of 1634 nodes were histologically diagnosed as metastatic. Low density areas surrounding enhancement rims were metastatic nodal central necrosis or keratinization. Enhanced areas in many metastatic nodes were considered to be lymphatic architecture, not metastatic masses especially in the avascular keratinization. Enhanced CT produced accurate information of lymph node size, location, shape, grouping and spread from nodes to adjacent structures.
However, it was considered that not every metastatic lymph node should show enlargement and/or enhancement. Improved assessment of solid metastatic features of lymph nodes (shape, size, and involvement) may be achieved with the aid of thin-thickness CT.

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Ninety-five patients, having squamous cell carcinoma of the lower alveolus and gingiva, underwent a potentially curative surgery at the Department of Oral Surgery, Hokkaido University Dental Hospital between 1975 and 1997. Marginal resection of the mandible has been performed for 47 patients and segmental resection has been done for 48 patients. Out of the 95 patients, 20 (21.1%) with local recurrence after initial surgical treatment were clinically investigated. Recurrence occurred in patients who showed moth-eaten type defect in preoperative radiographs. In three of the 20 patients, recurrence occurred near the margin of the resected mandible. Soft tissue recurrence occurred in 14 patients, i.e., four in the skin, three in the oropharyngeal isthmus, six in the floor of the mouth, and one in the submandibular region. In the other three cases, it could not be judged where the tumor recurred. The patients who showed moth-eaten type defect tended to have recurrence in the skin, in the oropharyngeal isthmus .
The median duration period between initial treatment and recurrence was 14.9 months (range, 1 to 68 months) . The duration period in cases with erosive type bone defect tended to be longer than in those with moth-eaten type bone defect.
The first local recurrence was treated by surgery in 13 patients as salvage, and 7 controlled locoregionally. Eleven of the 14 patients, who died of tumor, showed moth-eaten type bone defect in the preoperative radiographs. So the outcome of the patients who showed moth-eaten type defect was poor.
The percentage recurrence observed after therapy indicates that wider resection of the soft tissue surrounding the mandible is needed for the cases which showed moth-eaten type defect extended beyond the mandibular canal.

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One hundred nine cases of odontogenic tumor diagnosed from April 1980 to March 1997 at the Department of Dentistry and Oral Surgery, Toyama Medical and Pharmaceutical University were clinically studied on the basis of 1992 WHO classification. The results were as follows
1) Tumors were classified as 51 compound odontomas (46.8%), 35 ameloblastomas (32.1%), 17 complex odontomas (15.6%), 4 benign tumor (3.6%), and 2 malignant tumor (1.8%) .
2) The ratio of males to females was 1 : 0.9. The age at first visit ranged from 6 to 71 years, with a mean age of 26.7 years. Approximately 70% of all cases were under 30 years.
3) Most of the chief complaints were swelling (35.8%) or abnormal eruption of tooth (25.7%) . As for ameloblastoma, approximately 70% of its complain was swelling.
4) There were 43 cases (39.4%) in the maxilla and 66 cases (60.6%) in the mandible. The most frequent sites of ameloblastoma, compound odontoma, and complex odontoma were the mandibular molar region, the anterior tooth region of the maxilla, and the mandibular molar region of the mandible.

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T-cell lymphomas that participate in human T-cell leukemia virus type I (HTLV-I) are called adult T-cell leukemia/lymphoma (ATL/L) . A case of tumor-forming ATL/L in the mandible after treatment of adult T-cell leukemia (ATL) is reported herein.
A 69-year-old male visited our department with a complaint of swelling on the left mandible. The patient had underwent chemotherapy for adult T-cell leukemia 22 months before visiting our department. Intraoral examination revealed an elastic hard mass measuring 35×30×15mm in the left lower premolar region. Blood biochemical examination was positive for anti-HTLV-I antibody. A thoracoabdominal CT scan revealed no other lesion. Incisional biopsy confirmed the histopathological diagnosis of T-cell lymphoma, diffuse pleomorphic type. Although chemotherapy and radiotherapy were conducted, the patient died five months after the first treatment.

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