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Biomedical subjects

M Viamonte

Publications and source records attributed to M Viamonte.

At least 19 recordsLinked to original sources
PubMed1992

Primary squamous-cell carcinoma of the small bowel. Report of a case.

This is the first case report of a primary, pure squamous-cell carcinoma of the small bowel. Small bowel cancer represents only 1 to 2 percent of all gastrointestinal malignancies. Over 35 different histologic types of small bowel tumors have been described. By far, most small bowel epithelial tumors are metastatic. A 65-year-old white female presented with abdominal pain, melena, and hematochezia and was found to have a 5.5-cm, ulcerated, well-differentiated, keratinizing, squamous-cell carcinoma of the terminal ileum.

Aged↗
PubMed1979

Positioning device for cardiac series.

The author describes a new positioning device for use during radiography of the chest. This device is particularly helpful when doing a cardiac series.

Heart Diseases↗
PubMed1979

Morphologic-radiographic correlations of the pancreas.

Numerous noninvasive and invasive imaging modalities are available for the study of pancreatic disease. Disappointingly, the radiographic demonstration of a pancreatic neoplasm is more successful than the treatment of the disease. The proximity of large vascular structures to the pancreas makes its study technically difficult and explains why vascular invasion is readily caused by dispersion of pancreatic secretions (as seen in pancreatitis) or by neoplastic infiltration. The latter heralds nonresectability. Needle biopsy under fluoroscopic or echographic control appears to be gaining popularity as a simple, sensitive and specific method for establishing the diagnosis of pancreatic malignancy. Angiography has its highest yield in the diagnosis of islet cell tumors because they are generally hypervascular. This technique has been complemented by selective catheterization of pancreatic veins followed by hormone bioassay determinations.

Adenoma, Islet Cell↗
PubMed1978

Portosystemic communications studied by transhepatic portography;.

The experience of collecting 120 transhepatic portograms, performed in patients with different degrees of portal hypertension, affords the opportunity for discussing the anatomical and hemodynamic features of portosystemic communications. Multiple pathways of decompression were found. The coronary-gastroesophageal collateral formed pathways in 108 cases, other major collaterals in 41, and minor collaterals in 2. This multiplicity of communications suggests that no one vessel is indispensable as a collateral pathway.

Collateral Circulation↗
PubMed1978

Fluoroscopically guided thin needle aspiration biopsy of the abdomen and retroperitoneum.

The results of 49 transabdominal and translumbar thin needle percutaneous aspiration biopsies in patients suspected of having malignant disease are reported. A correct diagnosis was obtained in 40 cases. Placement of the Chiba needle was accomplished by fluoroscopically controlled biplane radiography during constrast examinations. No complications were encountered. The technique allows cytologic diagnosis of malignancy without high risk exploratory surgery, prolonged hospitalization, or delay of treatment. Use of fluoroscopic needle guidance and biplane radiography for confirmation of position using various contrast examinations as markers is felt to be superior to either CT or ultrasound. The technique is readily available in all radiology departments.

Abdominal Neoplasms↗
PubMed1978

Relief of malignant obstructive jaundice by percutaneous insertion of a permanent prosthesis in the biliary tree.

Twelve patients with malignant obstruction of the biliary tree were treated by dilating the lesion percutaneously and inserting an internal large-bore teflon prosthesis in place bridging the the stricture. All 12 patients had unresectable neoplasms. The procedure was devised because existing modes of palliation using surgical techniques are associated with significant mortality or mobidity. There are also many problems with nonsurgical catheter drainage. Decompression was achieved in all 12 patients as shown radiographically by passage of contrast into the duodenum. Disappearance of pruitus was achieved in seven of seven patients, and in 10 of 12 disappearance of jaundice (bilirubin, before prosthesis, 18.4 +/- 4.5 mg/dl [mean +/- 1 SD], bilirubin 1 month after prosthesis, 1.8 +/- 0.6 mg/dl [mean +/- 1 SD], P less than 0.001) with improvement of general clinical status was achieved. Percutaneous placement of a permanent biliary tract prosthesis is safe and effective for the palliative decompression of malignant biliary tract obstruction.

Adenoma, Bile Duct↗
PubMed1978

Computed tomography of the thorax.

Computed tomography of the chest is found to be a useful method in selected cases. Lipomas of the chest and mediastinum can be specifically diagnosed. Extent of malignant pulmonary processes can be assessed for resectability, since it can detect mediastinal nodes not properly seen in conventional chest tomography. Computed tomography of the chest is indicated in these two diagnostic problems.

Aged↗
PubMed1977

New techniques for interruption of gastroesophageal venous blood flow.

Enlarged gastroesophageal veins were successfully obliterated in 41 patients using embolization with modified autogenous clots and/or Gelfoam, balloon occlusion, iatrogenic perivenous hematoma, sclerosing agents (Sotradecol and Keflin), or a combination of these methods. Thirteen patients were actively bleeding when studied, and the site of bleeding was detected in 4. Surgical exploration of 16 patients and autopsy study of 5 showed persistent obliteration ranging between three weeks and seven months. No major complications requiring reparative surgery were encountered. Gelfoam soaked with Sotradecol is the preferred agent because it provides persistent obliteration of the embolized veins. Patients who are acutely bleeding or have done so previously are candidates for selective obliteration of the gastroesophageal veins.

Catheterization↗
PubMed1977

Pitfalls in transhepatic portography.

Difficulties commonly encountered in transhepatic catheterization of the portal vein and interpretation of portograms are discussed. A long-sleeved trocar is recommended. Curved guide wires and deflector assemblies may assist in superselective catheterization of the tributaries of the portal vein. The judicious use of embolic material (small volumes, slowly injected) should guarantee the success and safety of this technique. Transhepatic obliteration of the gastroesophageal veins is a relatively simple and usually successful form of palliative treatment for actively bleeding and stable gastroesophageal varices. Thoroughness of the embolization procedure and of interruption of blood flow in the gastroesophageal veins is necessary to prevent early recurrence of bleeding.

Catheterization↗
PubMed1977

Transhepatic obliteration of gastroesophageal varices: results in acute and nonacute bleeders.

Seventy-three patients with hepatic cirrhosis and bleeding gastroesophageal varices underwent transhepatic portal vein catheterization and variceal obliteration. Gastroesophageal varices were successfully obliterated in 32 patients actively bleeding and in 35 patients with stabilized bleeding gastroesophageal varices. The remaining six were technical failures. Follow-up examinations in 10 patients from 1 month to 3 years later showed persistent obliteration of embolized veins. Recurrence of variceal bleeding occurred in nine patients. This method should be considered as a palliative, effective adjuvant to the medical treatment of patients with bleeding gastroesophageal varices.

Acute Disease↗
PubMed1977

Some aspects of mediastinal anatomy and radiology.

High kilovoltage technique in chest radiography increases the visualization of the air-soft tissue boundaries of the mediastinum. The pulmonary-soft tissue interfaces account for pre- and paravertebral lines. The paravertebral and pleural-azygos-esophageal, central, posterior, and anterior lines of pleural contact are described, and displacement, deformities, and separation of the pleural reflections are illustrated.

Humans↗
PubMed1977

[Renal pancreatic venous anastomosis: anatomical, clinical and radiological study].

Abnormalities in the left urinary tract have been observed secondary to pancreatopathies. Venous connections between the distal spenopancreatic venous bed and the left adrenal-renal venous system have been demonstrated by cast corrosion technique and by radiographic studies in the cadaver. In all of our anatomic studies, except on one occasion, numerous venous connections between the portal and systemic veins were demonstrated. The intravenous pyelogram and particularly nephrotomography have great value when pathology of the body and/or tail of the pancreas is suspected. Indirect sign on the left renal vein thrombosis on the left side may suggest the presence of a pancreatopathy. With acute and chronic pancreatitis, pseudocyst of the pancreas, and pancreatic carcinomas, we have noticed changes in the left urinary tract.

Adolescent↗
PubMed1976

Percutaneous cholangiography with the Chiba University needle: a new, safe, and accurate method in the diagnosis of cholestatic syndromes.

A modified technique of percutaneous transhepatic cholangiography utilizing the Chiba University needle is described. This new technique employs injection of dye through a thin flexible 22 gauge needle with a short bevel while it is slowly withdrawn under a fluoroscopic monitoring. The results of several investigators are reviewed and indicate that failure to visualize the biliary radicals with the Chiba University needle virtually rules out extrahepatic obstruction. It is anticipated that this technique will replace the traditional sheathed needle cholangiography as a diagnostic modality in the evaluation of the jaundiced patient.

Cholangiography↗