Takakazu Koseki

Hourglass-shaped sublingual dermoid cyst: MRI features

Dermoid cysts located in the floor of the mouth are classified as submental or sublingual based on their location with respect to the mylohyoid muscle. The lesion was located in the midline, involved the genioglossus and geniohyoid muscles, and extended down to the area superior to the mylohyoid muscle. An hourglass-shaped cyst of the floor of mouth was seen. Such magnetic resonance imaging findings appear to be characteristic of an extended sublingual dermoid cyst.

Clinico-radiographic and histopathological considerations of twenty four cases of adenomatoid odontogenic tumor

SummaryThe clinical and histological findings in these AOT cases support the previous reports of this lesion.Radiographically, these were some characteristic findings. Usually, this lesion shows a well demarcated and monolocular radiolucency, and calcified foci are scattered frequently in it. In the case of this tumor it was related to an embedded tooth, with a radiolucent lesion that extends apically from the tooth crown and involves a considerable portion of the root, or it was located interdentally without any relation to an embedded tooth. The periodontal space disappears at the tumor area. This radiographic finding offers to important sign to decide if thc tooth is in connection with the tumor.

Eight cases of cementifying fibromas of the Jaws

SummarySeveral attempts have been made to classify the cementum-producing tumors, the latest being that proposed by a WHO group (1970) which is used here. The cementifying fibroma is one of these. The lesion is proliferative of fibrous tissue associated with cemental calcification that occurs central or peripheral to the jaw bones. The purpose of the present study is to establish the clinical-roentgenographic analysis of features of this intra-osseous tumor based upon 8 cases that we observed during 1968 to 1986 at Osaka Dental University Hospital.1.The age of the patients were distributed between 13 and 71 years with the average being 42.1.2.All of tumors occured in the mandible, in 5 patients in the premolar-molar region and in 3 patients in the middle mandibular region.3.The tumor has no characteristic roentgenographic features, but the roentgenographic appearance can be classifyied into 3 types, cystic, foggy, and mottled.4.The features of aggressive ossifying-cementifying fibroma are aggresive and locally invasive growth, but there were no patients in this study showing such roentgenographic findings.

Clinico-radiographic and histopathological considerations of six cases of calcifying odontogenic tumor

SummaryThe clinical and histological findings of our six cases of CEOT support the previously reported deta for this tumor. Regarding the ossification in this lesion it might be suggested that the degenerative calcified material induces dentinoid tissue formation.Radiographically, two kinds of characteristic patterns might be described. One was a well demarcated unilocular radiolucent lesion including various amounts of calcified bodies in it. Another was the multilocular or motteled appearance lesion associated with dense calcified masses and numerous irregular bony trabeculations.Every case of this tumor was associated with a fully formed embedded tooth.