In the present study, immunohistochemical detection of p53 oncoprotein was performed to determine whether the grade of differentiation and the histologic type of gastric adenocarcinoma, and the degree of atypia accompanied with adenoma can be related to p53 mutation. Paraffin sections of 22 gastric adenomas and 56 gastric adenocarcinomas were examined for the overexpression of p53 oncoprotein with the avidin-biotin peroxidase complex staining procedure. The obtained results were as follows; 1. All the 22 cases of adenomas and 16 cases of well differentated adenocarcinomas showed uniformly negative staining. 2.Seven of 18 cases of moderately differentiated adenocarcinomas(39%), and five of 30 cases of poorly differentiated adenocarcinomas(17%) exhibited p53 protein expression. 3. Three of 29 cases of diffuse type (10%) and 9 of 19 cases of intestinal type(47%) exhibited p53 protein expression. These results suggest that p53 mutation is important in carcinogenesis of the intestinal type of gastric adenocarcinoma, and there is no correlation between the differentiation of gastric adenocarcinoma and the degree of p53 oncoprotein overexpression.
Adenocarcinoma ; Adenoma

Plexiform schwannoma is a rare benign tumor arising from the peripheral nerve sheath and characterized by a multinodular and plexiform growth pattern. This tumor usually arises sporadically. In rare cases, plexiform schwannomas have been associated with neurofibromatosis type 2. Plexiform schwannoma should be differentiated from plexiform neurofibroma, because the latter is pathognomonic tumor of neurofibromatosis type 1 and has a potential of malignant transformation. We report a case of multiple plexiform schwannomas associated with bilateral acoustic neuromas and meningioma.
Meningioma ; Neurilemmoma* ; Neurofibroma, Plexiform ; Neurofibromatoses* ; Neurofibromatosis 1 ; Neurofibromatosis 2* ; Neuroma, Acoustic ; Peripheral Nerves

For the morphological analysis of DMBA (9,10-diemethyl-1,2-benzanthracene) induced tumor, thirty Sprague-Dawley rats were received 0.1 ml of a 2% paraffin solution of DMBA into the knee joint cavity, which was repeated three times at an interval of 4 weeks. The induced tumor masses were removed at the 12th week after the first injection. Histological and histochemical examinations (H & E, PAS, alcian blue, Van Gieson, prussian blue, reticulin, PTAH stain) and enzyme histochemical examinations (acid phosphatase, alkaline phosphatase, alpha-naphthyl acetate esterase) were performed. The results were as follows: 1) By the 12th week after the first injection of DMBA, the tumor incidence rate was 20 percent. 2) On histological and histochemical examination, most of the induced tumor disclosed the features of the fibrous histiocytoma originating from mesenchymal cells, and the remains sweat gland adenoma and adenocarcinoma originating from epithelial cells. 3) On enzyme histochemical examination, most of the mesenchymal cell-derived tumor cells showed positive reactions for acid phosphatase and alpha-naphthyl acetate esterase, which were similar characteristic features of enzyme stains as shown in the component cells of fibrous histiocytoma.
Rats ; Animals ; Incidence ; Adenocarcinoma ; Adenoma

PURPOSE: To evaluate CT findings of internal hernia. MATERIALS AND METHODS: Three patients with internal hernia had abdominal CT scans and two of them had small bowel follow through examinations. The CT features of two patients with retroanastomotic and one patient with left paraduodenal hernia were evaluated and correlated with small bowel follow through examinations, and surgical findings. Two patients with retroanastomotic hernia had a history of subtotal gastrectomy with antecolic gastrojejunostomy. The diagnosis of internal hernia was made on the basis of surgical find ings in two patients of retroanastomotic hernia, and characteristic barium study findings in one patient of left paraduodenal hernia. RESULTS: The small bowel follow through examination showed small bowel loops gathered in a circumscribed mass in the left mid abdomen, and delay in passage through these loops. In case of left paraduodenal hernia, abrupt narrowing of the distal duodenum could be identified. The characteristic CT findings of all three patients were whorling of the mesentery and mesenteric vessels in the left mid-abdomen. In the patient with left paraduodenal hernia, after resolution of the gastrointestinal symptoms, a follow-up CT scan showed spontaneous disappearance of whorling of the mesentery and mesenteric vessels suggesting spontaneous resolution of the hernia. In the other two cases, upon exploration of the abdomen, dilatation of afferent duodenum caused by adhesion between ligament of Treitz and adjacent bowel walls, and retro- anastomotic herniation of the efferent loops were found. CONCLUSION: The usual diagnosis of internal hernia is based on the appearance of the small bowel follow through examination. However, we consider that the whorling appearance(we call it whorling sign) of the mesentery and mesenteric vessels on CT scan is also suggestive of internal hernia in patients under clinical suspicion.
Abdomen ; Barium ; Diagnosis ; Dilatation ; Duodenum ; Follow-Up Studies ; Gastrectomy ; Gastric Bypass ; Hernia ; Humans ; Ligaments ; Mesentery* ; Tomography, X-Ray Computed

PURPOSE: To evaluate the radiologic findings of alimentary anthrax. MATERIALS AND METHODS: 19 patients with alimentary anthrax, which was caused by ingestion of contaminated beef, were included in this study. The diagnosis was made .b.y demonstration of Bacillus anthracis in smear and culture of the contaminated meat. We evaluated the clinical manifestations and the findings of thoracic, abdominal radiographs, cervical, abdominal ultrasonograms and abdominal CT scans. RESULTS: Out of the 19 patients with the alimentary infection, 9 had oropharyngeal form, 18 had abdominal form and 8 had combination of oropharyngeal and abdominal form. The patients had general symptoms and signs such as fever, chill, myalgia. Clinical symptoms and signs were sore throat, throat injection, throat ulcer and patch in oropharyngeal form, and nausea, vomiting, abdominal pain, diarrhea, and gross GI bleeding in abdominal form. Radiologic findings included enlarged cervical lymph nodes(36%) in oropharyngeal form, and paralytic ileus(26%), ascites(26%), hepatomegaly(21%), enlarged mesenteric lymph nodes(26%), small bowel wall thickening(5%) in abdominal form. In two patients, late complications occurred as intestinal obstruction due to ileal stricture with perforation, and inflammatory changes of pelvic cavity due to ileovesical fistula. CONCLUSION: Radiologic findings of alimentary anthrax are difficult in differentiation from those of other inflammatory bowel disease, but those radiologic findings with clinical manifestations may be helpful in diagnosis and evaluation of disease process in patients with alimentary anthrax.
Abdominal Pain ; Anthrax* ; Bacillus anthracis ; Constriction, Pathologic ; Diagnosis ; Diarrhea ; Eating ; Fever ; Fistula ; Hemorrhage ; Humans ; Inflammatory Bowel Diseases ; Intestinal Obstruction ; Meat ; Myalgia ; Nausea ; Pharyngitis ; Pharynx ; Tomography, X-Ray Computed ; Ulcer ; Ultrasonography ; Vomiting

BACKGROUND/AIMS: This study was aimed to examine if FB1 induced-hepatotoxicity involves apoptosis, and cholesteryl hemisuccinate (CS) pre-treatment would selectively interfere with FB1 induced-apoptosis of hepatocytes. METHODS: Sprague-Dawley rats were intravenousely injected with FB1 (1.25 mg/kg/day) for two days, and were sacrificed at 3, 6, 12, 24 and 48 hours after injection. Another experiment group was composed of rats with pretreatment of CS (100 mg/kg/day, i.p.) before FB1 injection. RESULTS: This study demonstrated that administration of hepatotoxic dose of FB1 to Sprague-Dawley rats resulted in liver injury leading to cell death by apoptosis. FB1-induced apoptosis was preceded by early elevation in serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), total cholesterol, and appearance of injured pre-apoptotic cells at 12 hours was followed by massive fragmentation and margination of heterochromatin at 24 hours. CS pre-treatment prior to FB1 injection ameliorated serum biochemistry and hepatic injury with apoptosis, demonstrated by histological, ultrastructural and TUNEL (terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end labeling) methods. In addition, there was remarkable decrease in number of PCNA (proliferative cell nuclear antigen)-positive proliferating hepatocytes compared to that of FB1 treated group. CONCLUSION: This study suggests that apoptosis significantly contributes to FB1-induced hepatotoxicity in vivo, and pre-exposure of rat to CS prevents FB1-induced hepatic apoptosis and proliferation.
Alanine Transaminase ; Animals ; Apoptosis* ; Aspartate Aminotransferases ; Biochemistry ; Cell Death ; Cholesterol ; Hepatocytes* ; Heterochromatin ; In Situ Nick-End Labeling ; Liver* ; Proliferating Cell Nuclear Antigen ; Rats* ; Rats, Sprague-Dawley

Adrenal pseudocysts are uncommon lesions which usually occur as a result of hemorrhage within the adrenal tissue. Adrenal hemorrhage is usually associated with severe stress, sepsis, pregnancy, syphilis, leukemia, or anticoagulant therapy but during steroid therapy, it is very rare. We report a case of adrenal pseudocyst that resulted from hemorrhage into the adrenal gland and is probably related to the exogenous administration of steroids. The patient was a 57-year-old woman who was treated with oradexon for 20 years for the treatment of a maculopapular lesion on her thigh as well as for arthritis. She underwent a right adrenalectomy due to the adrenal cystic mass. The wall of the cystic mass was composed of a thick layer of hyalinized fibrous tissue with remnants of adrenal cortical tissue on the outer aspect. The inner surface had no lining cells and the wall of the cyst contained many calcified plaques with hemosiderin pigment.
Pregnancy ; Female ; Humans ; Cysts

To investigate the morphologic evidence of acute renal failure by folate, histological, histochemical (PAS), enzyme histochemical (Na-K-ATPase, G6PD, and ALP), and ultrastructural studies were performed. The results are as follows: l) Oliguria was most severe 3 hours after folate and the urine volume was 24.8% that of the control group. 2) Histologically, dilatation of tubules, degeneration and focal necrosis of the cortical tubules, and PAS(+) droplets in the tubular lumen were noted. And also frequent mitoses, mild interstital connective tissue proliferation, and neutrophilic infiltrates were observed in the late stage. 3) On enzyme histochemical examination, the activities of Na-K-ATPase and ALP were decreased, but G6PD activity was increased in comparison with the control group. 4) The ultrastructural studies revealed cytoplasmic vacuoles, apical cytoplasmic blebbing, dense bodies, mildly swollen mitochondria, dilated endoplasmic reticulum, loss bf brush border of the proximal tubules, and loss of microvilli of the thin limb of Henle's loop. Later, marked attenuation or loss of infoldings of basal plasma membrane of the cortical tubules was recognized. According to above results, the cause of acute renal failure by late is thought to be the injuries of tubular epithelial cells including sodium pump secondary to tubular obstruction.
Rats ; Animals

Eccrine spiradenomas are clinically characterized by a solitary, tender mass and they are situated on the upper parts of the body, predominantly on the ventral aspect. We herein report two cases of eccrine spiradenoma in 35-year-old man and 53-year-old woman, which located on upper extremity and inguinal region. The masses are round, well circumscribed and measuring 0.7x0.5x0.5 cm, 5x4.5x3 cm in size, respectively. Histopathologically, the tumor consists of masses of two types of cells, intensely staining cells and pale staining cells, usually arranged in chains, cords and pseudoglands. Immunostainings for low molecular cytokeratin, high molecular cytokeratin, carcinoembryonic antigen, and S-100 protein show positivity in neoplastic cells. Electron microscopically, the tumor was composed of three types of cells, i. e. 1) round or ovoid tumor cells in shape with scanty cytoplasm and poorly developed intracytoplasmic orgenelles, 2) spindle shaped dark cells interconnected by desmosomes, 3) large epithelial cells with abundant cytoplasm and cytoplasmic intermediate filaments which formed glandular structures. The large epithelial cells joint each other by desmosomal attachments and luminal cells featured small numbers of microvilli, but either secretory granules nor ductal type granules were noticed.
Female ; Male ; Humans

Carcinoid tumors of the appendix are common incidental findings, but appendiceal tumors with histologic features of both carcinoids and adenocarcinomas are rare, and their biologic behavior and histogenesis are still unclear. We report a case of goblet cell carcinoid of the appendix in a 54-year-old male, who exhibited pain in the right lower abdomen. Microscopically, the tumor contained smooth-bordered, widely separated nests composed of tumor cells with abundant mucin. The principal tumor cell type had a close resemblance to the normal goblet cell. Histochemically, the tumor cells revealed positive reaction for PAS and alcian blue stain. Immunohistochemically, the tumor showed strong reactivity for carcinoembryonic antigen, chromogranin and, neuron specific enolase but none for cytokeratin and epithelial membrane antigen.
Adenocarcinoma