[Splenic pseudocystic. Report of a case].

Splenic pseudocysts represent 70 to 80% of the non parasitic cysts of this organ. Malaria, infectious mononucleosis, tuberculosis and t. pallidum infection are predisposing factors.

[Gastric schwannoma. Report of a case].

Gastric schwannoma is a rare and benign neurogenic tumor. Diagnosis of this entity is uncertain previous to surgery, being this tumor localized in the sub-mucosa. Final diagnosis is achieved by surgical removal and histological examination.

[Glucose-6-phosphate dehydrogenase deficiency: report of 2 cases].

Glucose 6 phosphate dehydrogenase (G6PD) is an enzyme related to the metabolism of glutation, an antioxidant agent. Its deficiency causes hemolisis, generally well tolerated. However there are some factors including, exercise, infections and oxidants drugs that stimulate the hemolisis of the older red blood cells.

[Total and segmental colonic transit time. Clinical and prospective study using radiopaque markers in normal subjects].

We studied 18 normal voluntary subjects who received a diet containing 20 to 35 grams of fiber. A capsule with 20 radiopaque markers was given with breakfast and plain abdominal films of the abdomen taken every 12 hours until complete elimination of the markers. Calculation performed according to Ahran formula and final values were the result of the mean of all the subjects studied.

[Leiomyosarcoma of the gastrointestinal tract].

The records and biopsies of 10 patients with the diagnosis of leiomyosarcomas admitted at the Military Hospital "Dr. Carlos Arvelo" from 1962 to 1991, were reviewed. The sample correspond to 0.

[Mucinous papillary cystadenoma of the pancreas].

The case of a 15-years-old female patient is presented, who referred pain and presence of a mass in the left upper quadrant of the abdomen. Diagnostic imaging showed a 9 cm diameter cystic lesion in the tail of the pancreas which was removed surgically. Histology demonstrated a pancreatic mucinous cystadenoma with borderline biological behaviour.

[Gastroduodenitis and Helicobacter pylori in uremic patients].

We studied 26 patients (p) with end stage renal failure (RF) and 26 healthy volunteers (HV) to investigate the prevalence of Helicobacter pylori (Hp) and its relation with chronic gastritis (CG) and chronic duodenitis (CD). We analyzed 312 gastric and duodenal mucosal biopsies stained with H & E and Giemsa. Categorical data were assessed by the X2 and Fisher's exact test.

[Technique of cellular clot-block for the processing of material obtained by puncture-aspiration with fine needle].

A method is described for the processing of material obtained by fine needle aspiration. During the procedure, continuous aspiration, movement and rotation of the needle is performed in order to obtain at least 2 ml of material and blood. Samples are processed immediately for cytology and the rest of the material is left in the syringe until it coagulates.

[Heterotopic pancreas].

Heterotopic pancreas is a rare entity, usually asymptomatic, and found incidentally during laparotomy, when symptomatic it is for some complication, gastric obstruction, gastrointestinal hemorrhage, Meckel's diverticulum, obstructive jaundice. We report four patients, with this diagnostic and make a bibliographic review of this entity.

[Gastric emptying of fluids and gallbladder contraction in non-ulcer dyspepsia].

Non-ulcer dyspepsia is a frequent clinical entity characterized by chronic upper gastrointestinal symptoms without organic lesions by radiology, sonography or endoscopy. We studied simultaneously the rate of gastric emptying and gallbladder contraction in 10 patients with non-ulcer dyspepsia and in 10 healthy controls after ingestion of 500 cc of isotonic saline, and 500 cc of a liquid mixed meal, hypercaloric and hyperosmotic. The measurements were done by direct real-time ultrasonic imaging in fasting and were repeated at regular intervals (15-30 minutes) after the liquid meal, until complete gastric emptying was established.

[Antibodies against hepatitis C virus. Experience with a second generation test].

A second generation recombinant immunoblot assay to detect antibodies against Hepatitis C virus (RIBA II, Ortho Diagnostic Systems) was applied to 30 serum samples repeatedly reactive to ELISA anti-HCV c100-3, 11 from hemodialysis patients, 11 from patients with chronic hepatitis and 8 from patients with cirrhosis. The assay detects individual antibodies directed to 4 antigenic components of the C virus, 2 antigens, c100 and 5-1-1 contained in the original ELISA assay and 2 new antigens, c33c and c22-3 the latter structural in nature. From the total of 30 samples, 23 (77%) were reactive, 4 (13%) indeterminate and 3 (10%) non reactive to the RIBA II assay.

[Vascular compression of the duodenum].

The acute vascular compression of the duodenum is a well-recognized clinical entity, characterized by recurrent vomiting, abdominal distention, weight loss, post prandial distress. The cause of compression is considered to be effect produced as a result of the angle formed by the superior mesenteric vessels and sometimes by one of its first two branches, and vertebrae and paravertebral muscles, when the angle between superior mesenteric vessels and the aorta it's lower than 18 degrees we can saw this syndrome. The duodenojejunostomy is the best treatment, as well as in our patient.

[Conservative surgery of the sphincters for low rectal cancer].

A retrospective review was performed of 43 clinical records of patients who underwent surgical treatment for low rectal cancer less than 12 cm from the anus in the General Surgical Service of the Hospital Militar "Dr. Carlos Arvelo" of Caracas, between 1969 and 1988. 21 patients (49%) were males and 22 (51%) females with an average age of 61 years.

[Antibodies against hepatitis C virus in patients with liver diseases and in risk subjects. Preliminary report].

The recent discovery of an antigenic component of the causative agent of Non-A, Non-B hepatitis, has led to the characterization of this virus--Hepatitis C Virus (HCV)--and to the identification of an antibody present in infected subjects (anti-HCV) detected by means of the C-100 antigen derived from a nonstructural region of the viral genome. Using a commercial Kit (Ortho Diagnostic Inc.), the incidence of anti-HCV antibody was studied in the Military Hospital "Dr.

[Malignant thymoma with myasthenia gravis and hepatic metastasis. Report of a case and review of the literature].

This paper reports a case of an histological non aggressive thymoma with myasthenic symptoms as the first clinical manifestation. Three years after its complete surgical resection liver metastases appeared without evidence of intrathoracic neoplastic disease. The extrathoracic metastases are uncommon and the thymomatous myasthenia gravis is present in 25 to 50% of cases.

[Gastric emptying of different liquid test meals measured by ultrasonography].

The rate of gastric emptying of different liquid solutions was measured in 80 voluntary normal young male subjects (mean age 19.9 +/- 1.6 years) by direct real-time ultrasonic imaging.