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A case of peripheral odontogenic fibroma occurring in the posterior region of the maxilla in a 7-year-old girl is presented. The patient was referred to our hospital because of a painless swelling in the buccal gingiva at 6 1. Physical examination revealed a localized elastic-hard tumor, with no radiological abnormalities in the adjacent alveolar bone. A biopsy specimen showed proliferation of fibroblastic cells in the submucosal layer. With the patient under general anesthesia, the tumor was resected subperiosteally, and the underlying bone surface was smoothened with a bur. Histologically, the lesion was composed of cellular fibrous connective tissue with scattered regions of cellular strands interwoven with less cellular areas and islands of odontogenic epithelium. The final diagnosis was peripheral odontogenic fibroma. Specific staining demonstrated that the tumor stroma contained large amounts of oxytalan fibers and tenascin. A positive reaction for tenascin was found to be a valuable pathohistological marker that could distinguish between peripheral odontogenic fibroma and calcifying fibrous epulis.As of about 9 years after the operation, there has been no evidence of recurrence.

Branchiogenic carcinoma is a rare malignant tumor arising from the remnant of the branchial epithelium or the branchial cyst.We have experienced and treated a patient with branchiogenic carcinoma, the outline of which we report here.Patient: A 69-year-old female, visited our hospital on 21 May 1984, and complained of a swelling in the right neck and submandibular regions, where a thumb-haadsized tumor was found with palpation at the later region. On 20 June, the tumor was resected with a purpose of biopsy under general anesthesia. A histological examination of the mass clarified an existence of the squamous cell carcinoma with a cystic lesion. Lymphoid tissues were found under the cyst wall. The block of S.C.C.was considered as protruded part from the cyst wall. Several clinical examinations were performed, detecting a metastasis to the other organs, through which we could not find any other tumors. A diagnosis of branchiogenic carcinoma was finally decided upon. On 4 July, a radical neck dissection was done on suspection of upper neck metastasis, where upon a farther histological examination of the specimen confirmed a lymph node metastasis. Then postoperative irradiation and chemotherapy were performed in combination. The patient has survived now for over one and a half years since these treatments without any recurrence of the tumor.