No abstract available.

No abstract available.

To clarify the developmental characteristics of fetal esophageal epithelium especially ciliated cell, expressions of epidermal growth factor receptor (EGFR) and cytokeratin (CK) in fetal esophageal mucosa (16-24 weeks of gestation) were studied immunohistochemically, and ultrastructure of the ciliated cells was also observed. The expressions of EGFR and CK were identified in labelled streptoavidine biotin immunohistochemical method. Primary antibodies used were EGFR (Ab-4) which is affinity-purified from hyperimmune rabbit sera (Oncogene Science) and monoclonal mouse anti-human cytokeratin (DAK0-CK, MNFl16). The esophageal lumen was lined with stratified ciliated columnar epithelium between 16 and 24 weeks of gestation. The pattern of expression Of EGFR was different with gestational age and epithelial layer. The ciliated cell exhibited variable staining intensity for EGFR at 16 weeks. Some were stained intensively, and others were stained faintly. Number of ciliated cells stained intensively were gradually increased, and most of them were strongly stained at 24 weeks. The superficial non-ciliated cells, however, showed relatively constant staining property of moderate to intense between 16 and 24 weeks. EGFR immunoreactivity was minimal in the basal and intermediate cells at 16 weeks, but became more intense at 24 weeks. CK immunoreactivity in the ciliated cells between 16 and 24 weeks was similar to that of EGFR immunoreactivity. On the other hand, superficial non-ciliated cells were intense for CK staining at 16 weeks, but were very weak to negative at 24 weeks. CK immunoreactivity was intense in basal and intermediate cells between 16 and 24 weeks, but it was almost negative in the some cells of intermediate layer, especially beneath negatively stained non-ciliated cells, at 24 weeks. In electron microscopy, ciliated cells had well organized cilia and dense granules close to Golgi apparatus between 16 and 24 weeks. The cells apparently active in ciliogenesis were also observed. These cells had short microvilli, many centrioles, and dense granules close to Golgi apparatus. The non-ciliated cells contained numerous clear vesicles adluminally clustered at 16 weeks, while they had many dense vesicles of about same size of clear vesicles at 24 weeks. These results demonstrate the expressions of EGFR and CK in esophageal epithelium of human fetus between 16 and 24 weeks of gestational ages, and suggest that the ciliated cells are still proliferative at 24 weeks.
Animals ; Antibodies ; Biotin ; Centrioles ; Cilia ; Epithelium* ; Fetus* ; Gestational Age ; Golgi Apparatus ; Hand ; Humans* ; Keratins ; Methods ; Mice ; Microscopy, Electron ; Microvilli ; Mucous Membrane ; Pregnancy ; Receptor, Epidermal Growth Factor

PURPOSE: When Managing metastatic bladder tumors, to overcome the resistance mechanism of cisplatin is a main problem to be solved. The objective is to confirm the changes of general and ultrastructural morph ology with the induction of cisplatin resistance from the bladder cell line. MATERIALS AND METHODS: The samples of this investigation are 2ng/ml-cisplatin resistant human bladder cell lines T24R2 established by SNUH Urology and the drug resistant bladder cell lines T24 was obtained from ATCC, as a control group. We cultured the resistant cell line on the slide and observed it using light microscopy to see the general morphology. For the ultrastructural morphology, we fixed cultured cells, made an epon block, sliced an ultrathin section and observed it using H-71000 EM. RESULTS: Under light microscopy, the cytoplasm of the resistant cell line shows a plumper pattern than that of the parent cell. Under electronmicroscopy, the chromatin of the resistant cell line has a relatively finely dispersed chromatin pattern when compared to the parent cell line, which shows a coarse and aggregated chromatin pattern. Within the cytoplasm, the mitochondrial volume, dilated rough endoplasmic reticulum, polyribosomes and ribosomes are moderately increased in the resistant cell line when compared to the parent cell line. In particular, we found a great amount of double membrane vesicle near the cell surface and pinocytic vesicles on the surface, which are seldom observed within the parent cells. CONCLUSIONS: We concluded that the cisplatin resistant human bladder cell lines (T24R2) underwent a morphological change with the induction of cisplatin resistance, and we hypothesize that the resistant cell's ultrastructure, which shows morphological change, will be involved in the drug resistance mechanism. Regarding this matter, further research will be needed.
Cell Line* ; Cells, Cultured ; Chromatin ; Cisplatin* ; Cytoplasm ; Drug Resistance ; Endoplasmic Reticulum, Rough ; Humans ; Membranes ; Microscopy ; Mitochondrial Size ; Parents ; Polyribosomes ; Ribosomes ; Urinary Bladder Neoplasms ; Urinary Bladder* ; Urology

Acquired digital fibrokeratoma is an uncommon, solitary, round, firm, more or less hyperkeratotic projection, most frequently situated on fingers or toes but occasionally on the other locations. It arises out of a collarette of slightly raised skin and may have slight or great resemblance to a rudimentary supernumerary digit or may be mistaken for some other more ordinary condition such as an odd cutareous horn. We experienced a case of acquired digital fibrokeratoma on the right second finger in a 25-year-old male. We treated it with total excision.
Adult ; Animals ; Fingers ; Horns ; Humans ; Male ; Skin ; Toes

In 6 cases of invasive thymoma proved histologically from 1981 to 1984 in Yonsei University Medical Center,the CT findings and pattern were analysed. The results were as follows 1. Of 6 case, 4 were males and 2 werefemales. All cases were between 40-64 years and the average was 51 year old. 2. Of 6 cases, 2 female patients wereassociated with myasthenia gravis. 3. By the histological examination, 2 were confirmed as mixed cell type, 2spindle cell type, 1 lymphocytic type and 1 epithelial cell type. 4. CT findings of invasive thymoma were 1) Adiscrete but lobulated and irregular marginated soft tissue mass in the superoanterior mediastinum replacing thenormal mediastinal fat tissue. 2) Usually irregular low density areas within the mass suggesting central necrosisor calcification in 1 of 6 cases was noted. 3) Local invasiveness of the mass shown as obliteration of the normalfat planes surrounding great vessels, irregular thickenings or nodular shadows of the pleura, diagphragm andpericardium and irregular and ragged tumor-lung interfaces if the tumor invaded to these structures. 4) Frequentextention of tumor to middle and post. mediastinum along pericardium or mediastinal pleura with resultantextrinsic indentation and/or invasion of the hilar region. 5) Extensive tumor infiltration to middle and post.mediastinum in 1 case, indistinguishable from lymphoma. 6) Low attenuation numbered area of brain in another 1case, but not confirmed histologically.
Brain ; Epithelial Cells ; Female ; Humans ; Lymphoma ; Male ; Mediastinum ; Myasthenia Gravis ; Pericardium ; Pleura ; Thymoma

Intraspinal neurenteric cysts are rare congenital lesions that results from abnormal separation of germ layers in the third week of embryonic development, which may cause spinal compression. Although, the diagnosis of neurenteric cyst was very difficult prior to operation, MRI has proven to be a useful imaging modality in detection, localization and characterization of intraspinal neurenteric cysts. We recently experienced intraspinal neurenteric cyst in two patients who presented with progerssive quadriparesis. Myelography, CT myelography and MRI were taken and complete excision was performed. The MRI findings are presented and the literature is reviewed.
Diagnosis ; Embryonic Development ; Female ; Germ Layers ; Humans ; Magnetic Resonance Imaging* ; Myelography ; Neural Tube Defects* ; Pregnancy ; Quadriplegia

Eccrine spiradenoma is clinically characterized by a solitary, movable, tender noduie occurring most frequently on the ventral surfase of the upper body. A striking symptom is paroxysmal pain. Histopathologically, the encapsulated lobules of the tumor are composed of masses of basophilic cells, usually arranged in whorls, cords, and pseudogland.s. Within the whorls and pseudoglands, two types of celIs are notedperipheral intensely staining cells and central pale-staining cells. We describe herein a patient with an indolent eccrine spiradenoma, which had been diagnosed histopathologically.
Basophils ; Humans ; Strikes, Employee

No abstract available.
Humans

The authors experienced a case of gastroduodenojejunal trichobezoar detected by ultrasongraphic examination. We thought that tricholbezoar had relatively specific ultrasonographic findings such as a broad hyperechogenic superficial bandlike rim with a complete posteior sonic shadowing and multiple linear echogenic strands on its surface representing hairs, which were better seen after water ingestion. So we were able to get the correct diagnosis of trichobezoar prior to conventional barium studies in a patient who could not be suspected suspected clinically.
Barium ; Bezoars* ; Diagnosis ; Eating ; Hair ; Humans ; Shadowing (Histology) ; Ultrasonography* ; Water