Histopathologic studies of XXXX of the parotid gland.

@entity1 @entity11529 @entity2695 @entity5 @entity2477 @entity8146
Five hundred and eighty-four cases of primary @entity5 and @entity5 -like conditions were examined. Primary @entity2695 of the parotid gland were relatively rare, comprising 29 cases (4.9%) of 584 @entity5 . These could be divided into either @entity2477 or so-called @entity8146 . In our series, the incidence of the latter was 1.5% (nine cases), or 31.0% of the total number of @entity2695 . The so-called benign @entity8146 were found in @entity1 under the age of 12 months, during the infantile period, and occurred predominantly in females and on the right side. Histologically, this @entity5 showed a uniform growth pattern so that each lobular portion exhibited a strikingly identical appearance. The vascular lumina of the @entity5 were lined by flattened endothelial cells that were occasionally mixed with some plump cells showing mild atypism. Electron microscopy revealed that the @entity5 consisted of two distinct components, one being definite endothelial cells lining the vascular channels and the other pericytes located outside of the endothelium embracing the vascular channels. The @entity5 cells can be interchangeable with one another. It seems that this @entity5 is derived from the intralobular vascular system of the parotid gland. This @entity5 is benign in nature and found almost exclusively during the infantile period. Hence, from the clinicopathologic aspect, " @entity11529 " seems to be a more suitably descriptive term than simply " @entity8146 ".
