[Odontogenic myxoma: About four cases and review of the literature].

Objective: Odontogenic myxoma is an uncommon tumor that represent less than 0,5% of all bone tumors and only 3 to 6% of odontogenic tumors. The aim of this article was to catalogue the clinical cases diagnosed microscopically as odontogenic myxoma and to describe their clinical and radiographic characteristics, comparing these to the data found in the current literature.

Design: Histological and immunocytochemical examinations were performed on odontogenic myxomas from four Tunisian patients in a period of 23 years.

Adreno-cortical oncocytoma: a case report.

Background: Adrenal oncocytoma is a very rare lesion, non functioning and benignin most cases. Only 46 cases have been reported in the medical literature.

Aim: This study aimed to report a new case of adrenal oncocytic tumor with uncertain malignant potential.

[Microcystic serous pancreatic cystadenoma].

Background: The pancreatic cystic serous neoplasms are divided into two categories: benign serous cystadenoma (SCA) and malignant serous cystadenocarcinoma. Furthermore, based on the macroscopic appearances, SCAs are subdivided into serous microcystic adenomas (SMAs) and serous oligocystic or macrocystic adenomas.

Aim: Report of a new case of SMA in which we emphasize on the diagnostic difficulties encountered against such tumor despite its relatively radiological easiness compared to the other variants.

[Multilocular cystic renal cell carcinoma].

Background: Multilocular cystic renal cell carcinoma is an uncommon variant recently described of renal cell carcinoma.

Aim: Analyze clinicopathological features, imaging findings and prognosis and therapeutic options of this tumor.

Case Reports: The authors reported two cases of multilocular cystic renal cell carcinoma arising in 68 and 39-year-old men.

[Parotid basal cell adenoma of membranous type].

Introduction: Basal cell adenoma (BCA) is a rare benign neoplasm characterized by the basaloid appearance of the tumour cells and the lack of myxo-chondroid stromal component present in pleomorphic adenoma.

Aim: We report a case of basal cell adenoma of membranous type, highly suspected of malignancy because of the presence of mediastinal lymph nodes and pulmonary nodules which finally were related to an associated sarcoidosis.

Observation: Our patient was an 80-year-old woman who presented a swelling of the right parotid two years ago.

[Solid pseudopapillary tumors of the pancreas: a pediatric case report].

Background: Solid pseudopapillary tumors of the pancreas are extremely rare and mostly seen in young females. It is often diagnosed incidentally or during investigations of gastrointestinal complaints.

Aim: Report of a pediatric case of this tumor.

[Diagnostic value of immunohistochemistry in ovarian sex cord-stromal tumors].

Background: The ovarian tumors' diagnosis is based on biological and radiologic tests but only the histological examination associated to an immunohistochemical study allow best diagnosis.

Aim: The purposes of this study is to examine inhibin and other markers immunoreactivity to ovarian sex cord-stromal tumors and their histological mimics and to discuss its value in the differential diagnosis.

Methods: We report a retrospective study of 31 cases of ovarian sex cord-stromal tumors and review the clinical, pathologic and immunohistochimical features of these tumors.

Sinonasal leiomyoma: an exceptional localization.

Background: Most of the sinonasal tumours are of epithelial origin. Leiomyomas are very uncommon in the upper respiratory tract and extremely rare in the nasal cavity and paranasal sinuses. They account for less than 2.

[Accuracy of frozen section diagnosis: an analysis of 1695 consecutive cases].

Background: The intraoperative frozen section is a well established procedure for rapid diagnosis that helps in making therapeutic decisions.

Aim: Assessment of the accuracy of frozen section diagnosis and analysis of the causes of its discordance.

Methods: A retrospective review of 1695 surgical specimens performed in 1207 patients between January 2002 and April 2005.

[The value of intraoperative frozen section in surgical management of thyroid nodules. Report of 409 cases].

Objective: The purpose of this study was to assess the value of intraoperative frozen section diagnosis in thyroid surgery and determine its limitations.

Methods: This retrospective study examined the results of 409 frozen sections of thyroid specimens analyzed over the 4-year period and their correlations with the final histological examination.

Results: In our series, frozen section diagnosis was concordant with subsequent histopathological examination in 96.

[Histopathological study of gastric polyps. A report of 65 cases].

In a retrospective study of the specimens of gastric polypectomy, carried out between January 1992 and December 2002, we analysed the demographic and histological aspects of 65 polyps. This study revealed hyperplastic polyps in 66%, adenomatous lesions in 9.2%, Peutz-Jeghers polyps in 7.