Desmoplastic ameloblastoma (DA) is one of the 6 histopathological subtypes of ameloblastoma. Hybrid lesions in which histopathologically conventional ameloblastoma coexists with areas of DA are rare. A 40-year-old male was referred to our hospital complaining of a swelling in the right premolar region of the mandible. A panoramic radiograph showed an area of radiolucency with a well-defined corticated border, whereas computed tomography revealed a unilocular radiolucent lesion and buccal expansion together with cortical perforation. The lesion was treated via enucleation and curettage of the marginal bone and fenestration. A histopathological examination showed a hybrid ameloblastoma with a pronounced desmoplastic pattern and follicular changes. The patient's postoperative course has been favorable up to now, and no marked changes have been observed. We presented a case of hybrid ameloblastoma and reviewed the 36 reported cases of hybrid ameloblastoma that have been reported in the English literature.

Dentoalveolar injuries are common and are caused by many factors. Dental trauma requires special consideration when a missing tooth or tooth fracture accompanies soft tissue laceration. A tooth or its fragment occasionally penetrates into soft tissue and may cause severe complications. This report presents a case of delayed diagnosis and management of a displaced tooth in the vestibule of the mouth following dentoalveolar injury. This report suggests that radiography can lead to an early diagnosis and surgical removal of an embedded tooth in the soft tissue.

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Stage Ⅰ-Ⅱ舌扁平上皮癌における後発頸部リンパ節転移の予測因子要旨：Stage Ⅰ-Ⅱ舌扁平上皮癌(tongue squamous cell carcinoma：TSCC)における後発頸部リンパ節転移(late cervical lymph node metastasis：LCLM)の予測因子を抽出するために，後ろ向き研究を行った。初回治療として原 発巣切除術を施行した stage Ⅰ-Ⅱ TSCC 62 例を対象とした。年齢(60 歳未満 vs 60 歳以上) ，性別(男 vs 女) ，2017 年 UICC の T 分類(T1 vs T2) ，病組織学的分化度(高 vs 低・中) ，YK 分類(1・2・3・4C vs 4D) ，神経周囲浸潤と 脈管侵襲の有無，病理学的腫瘍深達度(pathological depth of invasion：pDOI. 3.5mm 未満 vs 3.5mm 以上) ，腫瘍蔟出

We report a case of multiple ossifying fibromas arising in the mandibular ramus, including the condylar process. A 19-year-old woman was referred to our clinic by her dentist because radiolucent lesions were detected in the right side of the mandible on a panoramic radiograph. Although she had no symptoms, CT images revealed multiple lesions in the right mandibular angle (lower lesion) and condylar process(upper lesion) . At first, complete removal of the lower lesion and partial removal of the upper lesion were performed with the use of a surgical template for pathological diagnosis. The specimens were definitely diagnosed as ossifying fibroma. Secondarily, we completely resected the upper lesion by open temporomandibular joint surgery. The bone defect of the condyle after tumor removal was immediately reconstructed with particulate cancellous bone and marrow harvested from the iliac crest. There was no evidence of recurrence or jaw dysfunction at the 3-year follow-up after surgery. : ossifying fibroma (骨形成線維腫) ， multiple ossifying fibroma (多発性骨形成線維腫) ， surgical template (手術用テンプレート) ， bone graft (骨移植) 1) 鶴見大学歯学部口腔顎顔面外科学講座 (主任：濱田良樹教授) 2) 済生会横浜市東部病院歯科口腔外科 (主任：堀内俊克部長) 3) 鶴見大学歯学部クラウンブリッジ補綴学講座 (主任：小川 匠教授) 1)