RESUMEN
Seven cases of mucoepidermoid carcinoma of minor salivary gl and s, located in the palate [five cases] and lip [two cases] were encountered in the present study. By light microscopy, three cell types [mucous, squamoid and intermediate] were observed. Ultrastructural examination of four of these cases was used to reveal the type of cellular differentiation. Mainly, biphasic patterns were detected [luminal and myoepithelial cells with varying degrees of differentiation]. Based on the present findings and its correlation with histogenetic aspect, acinar intercalated duct region can be stressed as an origin for the development of mucoepidermoid carcinoma in as much as most of salivary gl and tumors originate
RESUMEN
Dendritic cells containing melanin pigment have been demonstrated with silver impregnation in the epithelial lining of the maxillary sinus in seven cases. An extensive review of literature has shown that melanocytes are found in some unusual locations, but previous finding of their existence in the epithelial lining of the maxillary sinus has not been reported. The literature is reviewed, and the pathologic significance of this observation in relation to the histogenesis of melanomas of the paranasal sinuses with special emphasis to the maxillary sinus is discussed
Asunto(s)
MelanocitosRESUMEN
Melanoacanthomatous hyperplasia of the oral cavity is a rare reactive phenomenon analogous histologically to the skin melanoacanthoma. A few cases were previously reported in the literature under the name "oral melanoacanthoma". This study comprised the largest series and the first to be found in Asians. Fourteen cases were detected among 27 unclassified melanotic lesions, in which a definite history of trauma was documented in five cases. Histologically, bicellular proliferative reaction of dendritic melanocytes and squamous cell proliferation, which along with evidence of inflammation in the underlying lamina propria may characterize the lesion as a part of a spectrum of reactive process rather than neoplasia
RESUMEN
Two examples of calcifying epithelial odontogenic tumor, which contained areasdiagnostic for odontoma, were presented. The histologic presentation wasdiscussed with a special emphasis on the fact that these two separateodontogenic tumors have not been reported previously as occurringsimultaneously in one lesion
Asunto(s)
OdontomaRESUMEN
Eight cases of histocytosis X disease [H and-Schuller-Christian disease]; 2 cases-Eosinophilic granuloma; 2 cases-Letterer-Siwe disease; 4 cases] with oral lesions were studied histologically and histochemically. Histochemical evaluation of mucopolysaccharides was undertaken by application of PAS stain in an effort to establish, if any, histochemical criteria for microscopic differentation .The main proliferating cells were different in every tumor type; many eosinophils in eosinophilic granuloma, numerous histiocytes with foam cells in Hand-Schuller-Christian disease, large number of undifferentiated reticuloendothelial cells in Letterer-Siwe disease. The histochemical investigations revealed that strong PAS positive material could be observed in eosinophilic granuloma, while the other two forms showed faint reaction. Large number of cases are required to confirm such differences. Interestingly, dental tissue changes were observed in Letterer-Siwe disease; it comprised an increase in the width of secondary dentin and the interglobular dentin, hydropic degeneration of odontoblasts of the dental pulp. Since oral lesions might be the first manifestation of the disease, histologic differentiation betwewn these forms is considered to be an important factor in the diagnosis because of the extreme variability of prognosis and management