Lipomas of the infratemporal fossa are rare. We report a case that underlines the importance of imaging for diagnosis and treatment. We discuss the incidence, pathogenesis and diagnostic problems as well as therapeutic options for lipomas of the infratemporal fossa.

Les auteurs rapportent l'observation d'une paresthesie du nerf alveolaire inferieur secondaire a un depassement de pâte dentaire a la suite d'un traitement endodontique d'une premolaire mandibulaire et proposent une conduite therapeutique plus adaptee a ce genre de complication. Cette attitude decoule du souci de preservation de l'avenir fonctionnel des patients.

Periostitis ossificans and sclerosing osteomyelitis are rare subtypes of non suppurative chronic osteomyelitis in which there is, additionally, a proliferation of periosteum leading to bony deposition secondary to a mild chronic infection making their diagnosis difficult. The authors report two clinical cases and try to release criteria helping to discern them because the prognosis and therapeutic management of these affections are different.

The authors report two cases of maxillo-mandibular fibrous dysplasia showing different form and grow up features affecting two brothers without notion inherited transmission of the lesion. By the way, the diagnostic and the therapeutic management are discussed.

Postoperative blindness due to ischemic optic neuropathy is a rare and dramatic complication. A review of the literature from 1960 until nowadays reveal several physiopathological mechanisms of the blindness. Through the description of their clinic case of a fourty seven years old man showing definitive postoperative blindness after sustaining surgery for epidermoid carcinoma of the mouth floor, the authors suggest as etiology the conjunction of the following factors: brain venous high pressure, head and neck oedema, hypotension and the vascular state of the patient. Special perioperative care taking in account the risk factors is needed to prevent this complication.

Current data about oral hairy leukoplakia are reported. Clinical manifestations, histological and ultrastructural features and pathogenic mechanisms are firstly described. Then diagnosis are exposed. Finally, management is discussed.

Laryngeal leiomyosarcoma: histological, immunohistochemical and ultrastructural study of one case with review of the literature. Leiomyosarcoma of the larynx have rarely been reported and a review of the literature has yielded only 8 cases. Authors report a case in a 45-year-old patient. Histological exam of the surgical specimen showed a malignant spindle cell tumor. Ultrastructurally, neoplastic cells presented some features of smooth-muscle cells. Immunohistochemical studies revealed that most tumor cells coexpressed vimentin and smooth-muscle actin.

Fatty tissue is easily identified by magnetic resonance imaging by the enhanced signal in sequences weighted T1 and a weak signal in those weighted T2. A lipoma of parotid was identified fortuitously during investigation of a cerebral tumor.

A recent publication noted the apparent lack of serious complications of dilatation of salivary canals, based on a review of 16 cases. This is contested by the report of three cases of dilatation of Stensen's duct complicated by lithiasis and stenosis, with associated canalar pseudo-cysts. Surgical excision was required and allowed study of histopathology of this affection.

We report a case of a benign lymphoepithelial lesion of the parotid gland known as Godwin's tumor. This swelling of the parotid gland, appears as a tumor clinically as well as in scintigraphy and echography. The individual features of this tumor are recognized only during the histological examination: massive infiltration of the lobules of the parotid by a proliferative lymphoid tissue with differentiation to germinal centers and atrophy of the glandular acini. The treatment consists of a superficial parotidectomy. The frozen section avoids a total parotidectomy. In our case, the histological picture is quite particular due to the extensive cystic ductal dilatation and the presence of some calcifications. This aspect permit us to bring together the BLEL and the pseudotumoral calcinosis of the parotid gland. Those two lesions, occur under a context of disfunction, and they could be associated to a Gougerot-Sjögren (GS) syndrome. The BLEL could be considered as the pseudotumoral form of an isolated GS which could be completed after many years with the apparition of auto anti-bodies. The BLEL evoluates as a benign tumor but it's correlation with a malignant lymphoma or a lymphoepithelial carcinoma is also possible. Therefore it is important to follow-up these patients clinically, hematologically and immunologically after their parotidectomy.

Cutaneous and buccal manifestations of Crohn's disease are common. They are diagnostically helpful either by their specificity or from a biopsy which whilst access is easy offers less satisfactory results with buccal lesions. Stomatological clinical aspects are varied, most commonly of aphthoid or vesicular stomatitis type (as in the case reported here).

Two new cases of pseudo-tumoral parotid benign lymphoepithelial lesion serve as the basis for a review of the clinical aspects of "Godwin tumour". This is a pseudo-tumoral parotid swelling of non-characteristic clinical appearance which has the radiological findings of a systemic type sialogram ("punctate marks" and diffuse parenchymatous spots). Histopathological examination shows lesions affecting the whole gland but predominant in the swollen area, sometimes surrounded by a connective tissue pseudo-capsule. These lesions are the same as those seen in Sjögren's syndrome. There are virtually no humoral immunological abnormalities such as auto-antibodies nor inflammatory laboratory abnormalities. Whilst the diagnosis of this rare condition may be considered in the presence of any isolated parotid swelling with a sialogram of systemic type, the diagnosis of a benign lymphoepithelial lesion, eliminating a lymphoma, can be made only by histopathological examination of the parotidectomy specimen. These lesions could be the pseudo-tumoral form of isolated, so-called primary, Sjögren's syndrome. Some of these isolated syndromes become more complete after several years with the appearance of auto-antibodies. Clinical, immunological and haematological surveillance of these benign lymphoepithelial lesions is thus necessary during the years following parotidectomy.