Simple and aneurysmal bone cyst: Aspects of jaw pseudocysts based on an experience of Brazilian pathology service during 53 years.

BACKGROUND: Jaw pseudocysts are benign osseous lesions of unclear etiology. Among these, the simple bone cyst (SBC) and aneurysmal bone cyst (ABC) are intriguing bone pathologies still rarely studied together. This retrospective study aimed to present the long-term case series of patients with jaw pseudocysts focusing on the clinical, radiographic, and transoperative aspects. MATERIAL AND METHODS: A retrospective case series of patients with SBC and ABC was performed. Clinical, radiographic, and transoperative aspects of both pseudocysts were reviewed from the histopathological archives of 20,469 cases between 1959-2012. All descriptive data were summarized. RESULTS: Of 354 (15.25%) bone pathologies, 54 cases of jaw pseudocysts were found, with 42 (11.86%) SBC and 12 (3.39%) ABC cases. For both lesions, most of the sample were young Caucasian women with an asymptomatic posterior mandible lesion with undetermined time of evolution and none trauma history. A unique radiolucent scalloped lesion presenting an empty cavity were also observed for both conditions. However, some atypical findings were found for SBC including: the expansion of bone cortical, tooth resorption, displacement of the mandibular canal, and recurrence. The absence of painful symptoms and the lack of classical blood-filled cavity were observed in some cases of ABC. CONCLUSIONS: The SBC and ABC are bone pathologies with few retrospective studies, no previous studies on the two conditions, varied nomenclature, and atypical aspects in some cases. Therefore, the knowledge of clinical, imaging, and transoperative features of such pseudocysts are clinically valuable as diagnosis hypothesis of radiolucent lesions of the jaws.

Mucoepidermoid carcinoma: a retrospective study.

AIM: The aim of this study was to review the cases of mucoepidermoid carcinoma diagnosed at the Stomatology Service of São Lucas Hospital (PUCRS). METHODS: Medical charts were reviewed focusing on the sex and age of the patients, clinical aspect, anatomic site, signs and symptoms, size and histological grade of the lesion. RESULTS AND CONCLUSION: Of the 19383 patients who were seen between 1978 and 2009, 675 (3.48%) had a histopathological diagnosis of malignant neoplasm of the oral maxillofacial region including 12 (1.78%) cases of mucoepidermoid carcinoma. The mean age of patients with mucoepidermoid carcinoma was 43.8 years, and there was a predilection for males (58.7%). All cases occurred in the minor salivary glands, and the palate was the site most frequently affected (41.7%). Pain and local irritation were present in 50% of cases, and the size of lesions ranged from 0.3 cm to 5.0 cm. The histological classification of low- and intermediate-grade occurred at the same frequency (36.4%), and symptoms (pain, local irritation) occurred indiscriminately in different grades of tumor.