Fine structure of an intracerebral epithelial cyst

1974 ◽  
Vol 41 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Nitya R. Ghatak ◽  
Asao Hirano ◽  
Samuel S. Kasoff ◽  
H. M. Zimmerman
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Basement Membrane ◽  
Single Layer ◽  
Cellular Transport ◽  
Epithelial Cyst ◽  
Choroid Plexus Epithelium ◽  
Content Type ◽  
Pinocytotic Vesicles ◽  
Fine Print

✓ The wall of an intracerebral extraventricular cyst was studied with the electron microscope. The lining of the cyst consisted of a single layer of nonciliated, flattened or cuboidal epithelium similar to that in an ependyma. Unlike the ventricular ependyma, the lining cells of the cyst were bordered by a continuous basement membrane abutting on the leptomeninges or on the compressed brain tissue and thus shared some morphological similarities with the choroid plexus epithelium. Although pathogenesis of the cyst remains obscure, the fine structure of the lining cells is suggestive of their neuroepithelial origin. The occurrence of abundant pinocytotic vesicles in these cells further suggests the possibility of cellular transport of fluid to account for the continued expansion of the cyst.

Choroidal epithelial cyst

1977 ◽  
Vol 47 (6) ◽  
pp. 955-960 ◽  
Author(s):  
Atsuo Koto ◽  
Dikran S. Horoupian ◽  
Kenneth Shulman
Keyword(s):  
Cerebrospinal Fluid ◽  
Electron Microscope ◽  
Epithelial Cells ◽  
Basement Membrane ◽  
Single Layer ◽  
Epithelial Cyst ◽  
Content Type ◽  
Choroidal Epithelium ◽  
Surgical Extirpation ◽  
Fine Print

✓ A supratentorial cyst in the leptomeninges of an 8-month-old infant was studied with the electron microscope. The lining of the cyst consisted of a single layer of pegshaped epithelial cells rich in organelles and glycogen. Their free border had numerous microvilli but no cilia, and their basal portions rested on a basement membrane. Tight junctions and interdigitations were frequent between contiguous cells. The blood vessels were fenestrated. Since these features characterize developing choroidal epithelial cells, we felt the diagnosis of choroidal epithelial cyst was justified. Cysts lined by choroidal epithelium may continue to secrete cerebrospinal fluid after surgical extirpation when this is incomplete. Accumulation of the fluid in the partially excised cyst bed may therefore account for recurrence of symptoms.

Ecchordosis physaliphora

1971 ◽  
Vol 34 (5) ◽  
pp. 672-677 ◽  
Author(s):  
Richard B. Wyatt ◽  
Sydney S. Schochet ◽  
William F. McCormick
Keyword(s):  
Electron Microscope ◽  
Biological Difference ◽  
Content Type ◽  
Acid Mucopolysaccharides ◽  
Ecchordosis Physaliphora ◽  
Pinocytotic Vesicles ◽  
Vacuolated Cells ◽  
Fine Print

✓ Ecchordosis physaliphora, an asymptomatic gelatinous excrescence arising from the clivus, is occasionally encountered at autopsy. Morphologically, ecchordosis closely resembles notochord and chordoma. All three consist of vacuolated cells that contain acid mucopolysaccharides. Under the electron microscope, the intracellular vacuoles have a smooth limiting membrane whereas the extracellular vacuoles are lined by microvilli and pinocytotic vesicles. No ultrastructural features accounting for the biological difference between ecchordosis and chordoma are observed in this study.

Epithelial cyst of the fourth ventricle

1990 ◽  
Vol 73 (6) ◽  
pp. 942-945 ◽  
Author(s):  
Kenshi Yoshida ◽  
Saburo Nakamura ◽  
Takashi Tsubokawa ◽  
Jun Sasaki ◽  
Tadashi Shibuya
Keyword(s):  
Basement Membrane ◽  
Cyst Wall ◽  
Fourth Ventricle ◽  
Epithelial Layer ◽  
Epithelial Cyst ◽  
Histological Findings ◽  
Content Type ◽  
Ultrastructural Studies ◽  
Endodermal Origin ◽  
Fine Print

✓ A case of epithelial cyst in the fourth ventricle of a 4-year-old child is described. A single epithelial layer with a clear basement membrane lining the cyst wall was observed. There were no prominent histological findings to suggest a pathogenesis for this cyst based on immunohistochemical or ultrastructural studies; however, the cyst fluid contained significant amounts of carcinoembryonic antigen. It is considered that the epithelial layer lining the cyst wall was possibly of endodermal origin.

Intradural epithelial cyst at the craniovertebral junction

1990 ◽  
Vol 73 (5) ◽  
pp. 788-791 ◽  
Author(s):  
Robert E. Breeze ◽  
Peter Nichols ◽  
Hervey Segal ◽  
Michael L. J. Apuzzo
Keyword(s):  
Craniovertebral Junction ◽  
Epithelial Cyst ◽  
Content Type ◽  
Fine Print

✓ A case of an intradural epithelial cyst at the craniovertebral junction is reported in a 37-year-old man. The classification of these rare lesions is discussed.

Interhemispheric cyst of neuroepithelial origin in association with partial agenesis of the corpus callosum

1980 ◽  
Vol 52 (3) ◽  
pp. 399-403 ◽  
Author(s):  
Lillian C. Solt ◽  
John H. N. Deck ◽  
Roger Scott Baim ◽  
Karl TerBrugge
Keyword(s):  
Corpus Callosum ◽  
Adult Patient ◽  
Choroid Plexus ◽  
Ct Angiography ◽  
Computerized Tomography ◽  
Cyst Wall ◽  
Choroid Plexus Epithelium ◽  
Content Type ◽  
Interhemispheric Cyst ◽  
Fine Print

✓ The authors report an adult patient with a symptomatic interhemispheric cyst demonstrated by computerized tomography (CT), angiography, and at surgery. Choroid plexus epithelium was identified arising from the inner aspect of the cyst wall. Partial agenesis of the corpus callosum is postulated on the basis of the CT findings and the presence of choroid plexus in the interhemispheric cyst.

Neurosurgical desmoid tumors

1979 ◽  
Vol 50 (6) ◽  
pp. 725-732 ◽  
Author(s):  
Reinhard L. Friede ◽  
Anita Pollak
Keyword(s):  
Fine Structure ◽  
The Other ◽  
Differential Diagnoses ◽  
Desmoid Tumors ◽  
Content Type ◽  
The Family ◽  
Fine Print

✓ Four neurosurgical tumors of desmoid appearance are presented, along with a brief review of the differential diagnoses of intracranial or spinal fibromatous or desmoid lesions. Two of the tumors were identified as extremely collagenized meningiomas by their typical fine structure. The classification of the other two tumors remains uncertain, but they were thought to belong to the family of desmoid tumors.

Malignant melanoma of the choroid plexus epithelium

1972 ◽  
Vol 36 (3) ◽  
pp. 344-347 ◽  
Author(s):  
Robert A. Beatty
Keyword(s):  
Malignant Melanoma ◽  
Choroid Plexus ◽  
Choroid Plexus Epithelium ◽  
Content Type ◽  
Fine Print

✓ A patient with a malignant melanoma of the choroid plexus epithelium is described. The embryological implications of the epithelial rather than stromal location are emphasized. This case appears to be unique in the literature.

Surface ultrastructure of human ependyma

1976 ◽  
Vol 45 (1) ◽  
pp. 52-55 ◽  
Author(s):  
Lawrence C. Dempsey ◽  
Surl L. Nielsen
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Ultrastructure ◽  
Content Type ◽  
Fine Print ◽  
Scanning Electron

✓ Specimens of human ependyma obtained immediately after death were immersion-fixed and studied with a scanning electron microscope. Human ependyma is nearly identical in its surface ultrastructural features to the ependyma of other mammals.

scholarly journals The Fine Structure of a Multiterminal Innervation of an Insect Muscle

1959 ◽  
Vol 5 (2) ◽  
pp. 241-244 ◽  
Author(s):  
George A. Edwards
Keyword(s):  
Endoplasmic Reticulum ◽  
Plasma Membrane ◽  
Fine Structure ◽  
Electron Microscope ◽  
Basement Membrane ◽  
Neuromuscular Junctions ◽  
Abdominal Muscle ◽  
Membrane Material ◽  
Detailed Structure ◽  
Insect Muscle

The detailed structure of nerve branches, neuromuscular junctions, and muscle fibers of a multiterminal innervation of cockroach abdominal muscle has been studied with the electron microscope. The muscle fiber is of the banded myofibril type; with paired mitochondria and abundant endoplasmic reticulum. The peripheral nerve branches are multiaxonal with large central axon and several small peripheral tunicated axons. Tracheoblasts closely accompany the nerve branches. The multiple neuromuscular junctions show typical axonal vesicles, muscle aposynaptic granules, and close plasma membrane apposition with no interposition of basement membrane material.

scholarly journals The Fine Structure of the Interrelationship of Cells in the Human Epidermis

1958 ◽  
Vol 4 (5) ◽  
pp. 529-538 ◽  
Author(s):  
George F. Obland
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Cell Membrane ◽  
Basement Membrane ◽  
Surface Area ◽  
Epidermal Cell ◽  
Functional Significance ◽  
Intercellular Bridges ◽  
Human Forearm ◽  
Extensive Surface

In the present investigation an analysis has been made of the fine structure of the interrelationships of cells in human forearm epidermis by means of the electron microscope. The "intercellular bridges," here called attachment zones, are more complex than has previously been recognized. It is shown that dense oval thickenings, called attachment plaques, appear in apposed areas of adjacent epidermal cell membranes. The tonofibrils terminate at the internal face of the attachment plaque and do not traverse the 300 A distance between apposed plaques. Seven intervening layers of unidentified substance occupy the space between attachment plaques. The attachment zones appear in all of the classical histological layers of the epidermis. The portions of epidermal cell membrane not involved in intercellular attachments have extensive surface area resulting from plication of the membrane, and its further modification to form microvilli. The possible functional significance of these observations is discussed. Prior observations concerning the basement membrane of epidermis are confirmed. Identification of epidermal melanocytes is achieved, the finer morphology of their dendritic processes is described, and their relationship to epidermal cells is discussed.

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