نتایج جستجو برای: myoepithelial tumor
تعداد نتایج: 428937 فیلتر نتایج به سال:
Adenomyoepithelioma (AME) is a rare benign tumor composed of myoepithelial cells (MECs) which are located beneath the epithelial cells of exocrine glands, especially in breast and salivary glands. These tumor cells show biphasic proliferation of epithelial and MECs. Malignant AME is characterized by distant metastasis, local recurrence, cytologic atypia, high mitotic activity and infiltrating t...
A renal myoepithelial hamartoma presented as a lucent filling defect with gross hematuria in an adult female. Preoperative studies caused conflicting impressions. The predominance of smooth muscle and incorporated tubuloepithelial elements characterize the tumor as a hamartoma of myoepithelial type. Pertinent review of the literature confirms the rarity of this lesion in adults.
Myoepithelial hamartoma is a very rare submucosal tumor of the stomach. Magnus-Alsleben first described 5 cases of this tumor in 1903. More recently (1993) Vandelli et al. published a review of the literature comprising only 33 cases. Histologically, the tumor is characterized by hypertrophic smooth muscle bands surrounding diverse epithelial elements that can be arranged in different ways: as ...
Soft tissue myoepithelial tumors of the head and neck region are very rare, and only one case of soft tissue myoepithelial tumor occurring in the masticator space has been reported in the world literature. A case of soft tissue myoepithelial tumor with benign histomorphology, but with an invasive growth pattern, occurred in the masticator space of a 46-year- old male patient. Magnetic resonance...
Abstract Background Invasive micropapillary carcinoma (IMPC) is a rare malignant breast tumor and variant form of invasive ductal that an aggressive neoplasm the human canine mammary gland. The importance microenvironment in cancer development has gradually been recognized, but little known about cell types outlining cystic space IMPC. This study aimed to characterize neoplastic cells Results I...
Epithelial myoepithelial carcinoma is a rare biphasic low grade neoplasm of salivary glands; it most commonly occurs in the parotid gland but can also arise in minor salivary glands. Here a case of 58-year-old female presented with left cheek swelling of one-year duration. CT scan revealed a localized submandibular salivary gland tumor mass not involving surrounding tissues. Histological examin...
Epithelial and myoepithelial cells coexist in the rat R3230AC mammary tumor. To test the hypothesis that these two cell types constitute interactive but independent neoplastic populations, we obtained in vitro cell lines with epithelial or myoepithelial patterns and transplanted them in syngeneic animals. One stabilized line (EPI) and four cloned lines (A, C, D, E) with epithelial characteristi...
BACKGROUND The differential diagnosis of salivary carcinomas is always difficult and challenging. Salivary neoplasms often shows more than one growth pattern and significant morphologic variability may exist within a single tumor and between different tumors. The aim of this study was to examine the role of DOG1 (discovered on gastrointestinal tumor-1) and p63 immunohistochemistry in the diagno...
Benign and malignant neoplasm of myoepithelial cells comprise a rare but well-characterized group of tumors in the salivary glands, breasts, and soft tissues. Histopathologically, myoepitheliomas show solid, reticular, trabecular architecture and myxoid or hyaline stroma, and are composed of round/epithelioid or spindle cells. The tumor cells of myoepitheliomas possess the capacity for epitheli...
Mammography screening has increased the detection of early pre-invasive breast cancers, termed ductal carcinoma in situ (DCIS), increasing the urgency of identifying molecular regulators of invasion as prognostic markers to predict local relapse. Using the MMTV-PyMT breast cancer model and pharmacological protease inhibitors, we reveal that cysteine cathepsins have important roles in early-stag...
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