Secretory meningioma have been described as a distinct variant of meningioma based on their histologic, immunohistochemical and ultrastructural features of epithelial and secretory differentiation of meningothelial cells with accumulation of secretory material in the form of hyaline inclusion. Secretory meningioma is also a benign tumor having similar biological behaviour to that of typical meningiomas: hence, it is important for it to be recognized and diagnosed correctly to avoid unnecessary radiation and chemotherapy. Here we present a case of secretory meningioma with typical morphologic features. The patient was a 56-year-old woman with bilateral visual disturbance. A well-circumscribed mass was present in the left frontal lobe of cerebrum with surrounding edema. The tumor was composed of whorls of meningothelial cells and abundant intra- and extracellular eosinophilic hyaline inclusions which showed immunoreactivity for epithelial membrane antigen(EMA) and carcinoembryonic antigen(CEA). Ultrastructural features also supported epithelial and secretory differentiation of tumor cells.
Brain Neoplasms/immunology/*pathology ; CA-15-3 Antigen/analysis ; Carcinoembryonic Antigen/analysis ; Case Report ; Female ; Human ; Meningioma/immunology/*pathology ; Middle Age ; Tomography Scanners, X-Ray Computed

The clinical, radiological and pathologic features of a biphasic synovial sarcoma in the left elbow joint of a two-year-old male Rottweiler are presented. The tumor showed positive immunoreactivity for vimentin, Epithelial Membrane Antigen (EMA), p53 and PCNA, while it was negative for the cytokeratin used, S-100, Rb and p21. Immunohistochemistry for EMA allowed the identification of epithelioid components of synovial sarcoma, and may, therefore, contribute in establishing a diagnosis of biphasic synovial sarcoma. Intratumoral variation in PCNA immunoreactivity was minimal, indicating that the various tumor components proliferate at more or less similar rates. Overall, the characterized immunohistochemical profile for canine synovial sarcoma, not defined previously, may provide clues to the histogenesis of the phenotypically mesenchymal and epithelial elements of the tumor, and may be of value in the differential diagnosis of challenging cases, decreasing the risk of under- and mis-diagnosis. Although more cases need to be studied to determine whether there is a consistent pattern of immunostaining in canine synovial sarcoma, its potential significance is discussed in relation to the histogenesis, molecular pathology and differential diagnosis of canine synovial sarcoma.
Animals ; CA-15-3 Antigen/analysis ; Dog Diseases/*pathology/radiography ; Dogs ; Elbow Joint/abnormalities/pathology/radiography ; Forelimb ; Histocytochemistry/veterinary ; Immunohistochemistry/veterinary ; Keratins/analysis ; Male ; Oncogene Protein p21(ras)/analysis ; Proliferating Cell Nuclear Antigen/analysis ; Retinoblastoma Protein/analysis ; Sarcoma, Synovial/chemistry/pathology/radiography/*veterinary ; Soft Tissue Neoplasms/chemistry/radiography/*veterinary ; Tumor Suppressor Protein p53/analysis ; Vimentin/analysis

Osteoclast-like giant cell tumor of the pancreas is a very rare neoplasm, of which the histiogenesis remains controversial. A 63-yr-old woman was hospitalized for evaluation of epigastric pain. An abdominal computerized tomography revealed the presence of a large cystic mass, arising from the tail of pancreas. A distal pancreatectomy with splenectomy was performed. Histologically, the tumor was composed of mononuclear stromal cells intermingled with osteclast-like giant cells. In addition, there was a small area of moderately to well differentiated ductal adenocarcinoma. The final pathologic diagnosis was osteoclast-like giant cell tumor of the pancreas with ductal adenocarcinoma. Here, we describe the histopathological, immunohistochemical, ultrastructural and molecular biological findings of this tumor with review of the literature pertaining to this condition.
Antigens, CD/analysis ; Antigens, Differentiation, Myelomonocytic/analysis ; CA-15-3 Antigen/analysis ; Carcinoma, Pancreatic Ductal/metabolism/*pathology/ultrastructure ; Diagnosis, Differential ; Female ; Giant Cell Tumors/metabolism/*pathology/ultrastructure ; Humans ; Immunohistochemistry ; Keratin/analysis ; Microscopy, Electron ; Middle Aged ; Osteoclasts/*pathology ; Pancreatic Neoplasms/metabolism/*pathology/ultrastructure ; Proliferating Cell Nuclear Antigen/analysis ; Vimentin/analysis

We report a rare case of giant vascular eccrine spiradenoma (GVES) which developed in 56-yr-old Korean woman. It is a rare variant of eccrine spiradenoma (ES), which might be mistaken for angiomatous lesions in view of its florid vascularity and hemorrhagic features. Histogenesis of GVES is not clearly elucidated although it is known that ES presumably originates in the eccrine glands. To clarify the histogenesis of GVES, immunohistochemical stainings using various monoclonal antibodies were also performed. The tumor was composed of three types of cells, namely pale epithelial cells, small basal cells, and myoepithelial cells. Therefore, we conclude that GVES originated from eccrine gland and mainly differentiates toward secretory portion of secretory coil.
Actins/analysis ; Adenoma, Sweat Gland/blood supply/metabolism/*pathology ; Biological Markers/analysis ; CA-15-3 Antigen/analysis ; Eccrine Glands/blood supply/chemistry/*pathology ; Female ; Humans ; Immunohistochemistry ; Keratin/analysis ; Korea ; Membrane Proteins/analysis ; Middle Aged ; Muscle, Smooth/chemistry ; Sweat Gland Neoplasms/blood supply/metabolism/*pathology