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Biomedical subjects

K M Yeon

Publications and source records attributed to K M Yeon.

At least 73 records · Page 4Linked to original sources
PubMed1995

Cystic expansile masses of the maxilla: differential diagnosis with CT and MR.

PURPOSE: To describe the CT and MR findings of various entities causing cystic expansile masses in the maxilla and the significance of the cortical bony plate between the lesions and sinus cavities in the differential diagnosis. METHODS: CT findings of 28 patients with cystic expansile masses of the maxilla, including 20 cases of maxillary mucoceles (17 postoperative mucoceles, 2 mucoceles of a septated compartment of the maxillary sinuses, and 1 maxillary antral mucocele with inflammatory ostial obstruction), 3 cases of fissural cyst, 4 cases of odontogenic cyst, and 1 case of maxillary cystic ameloblastoma, were reviewed. Six cases (4 postoperative mucoceles and 2 odontogenic cysts) were also examined with MR. RESULTS: A thin bony plate between the lesion and antral cavity was demonstrated in every extraantral lesion (ameloblastoma, fissural cysts, and odontogenic cysts) and distinguishing these abnormalities from the antral lesions (mucoceles). All mucoceles showed findings of antral lesions except 2 cases of mucoceles at the septated compartments of the sinuses, in which thin bony septa were identified between the lesions and remaining sinus cavities. Postoperative mucoceles showed hyperostotic and retracted bony walls caused by previous surgery and localized erosion of bony walls with localized bulging of the cystic masses in every case. CONCLUSION: In the differential diagnosis of cystic masses of the maxilla, careful identification of the bony walls of the antrum and bony septa may allow one to locate the origin of a mass as antral or extraantral. This is important to an appropriate differential diagnosis.

Adult↗
PubMed1995

Stenosis of the inferior vena cava caused by a traumatic diaphragmatic hernia: case report.

Post-traumatic obstruction of the inferior vena cava (IVC) or hepatic veins is uncommon. Ultrasound examination of a patient with hematuria revealed multiple intrahepatic venous collaterals. MRI showed a herniated right lobe of the liver and a narrowed hepatic segment of the IVC above the level of the patent right hepatic vein insertion. Multiple intrahepatic collaterals around the middle hepatic vein were demonstrated on inferior venacavography. The intrahepatic IVC was angulated and markedly narrowed below the right atrium. Surgical reduction of the herniated right lobe of the liver and repair of the ruptured diaphragm with Teflon felt was performed. On follow-up inferior venacavography, angulation of the IVC was relieved and the intrahepatic collaterals had disappeared. Hematuria subsided after operation.

Child↗
PubMed1994

Castleman disease in the child: CT and ultrasound findings.

Castleman disease is a relatively rare disorder affecting young adults. We present the CT and ultrasonographic findings of Castleman disease in two children. In one patient with hyaline-vascular type disease, CT showed a well-enhancing mass in the right paratracheal area. In a second patient with plasma cell type disease, there was a solid, homogeneous mass in the retroperitoneal space which was poorly enhancing. Ultrasound showed a uniform hypoechogenic mass in both cases.

Castleman Disease↗
PubMed1994

Hemolytic uremic syndrome: MR findings of CNS complications.

MR findings of a patient with hemolytic uremic syndrome involving the CNS are described. Abnormal high signal intensity on T2-weighted images combined with swelling in the lentiform nucleus, posterior limb of internal capsule, external capsule bilaterally, and left extreme capsule was shown on initial MR; a small low signal intensity in the left putamen on T1- and T2-weighted images and generalized atrophy in the area of high signal intensity on previous T2-weighted images was shown on follow-up MR. These findings indicate infarct with focal hemorrhage, which is one of the histopathological features of CNS complication in hemolytic uremic syndrome.

Brain Diseases↗
PubMed1994

Undifferentiated embryonal sarcoma of the liver: US and CT findings.

Six cases of undifferentiated embryonal sarcoma (UES) were reviewed to determine their characteristic features on ultrasonography (US) (n = 5) and computed tomography (CT) (n = 6). US demonstrated a single large, echogenic mass with some anechoic spaces. Contrast-enhanced CT scan revealed a well-demarcated low-attenuation mass with hyperdense septations of variable shape and thickness. Discrepancy of internal architecture on US and CT was one of the important characteristics of UES. CT numbers were 25-47 HU in low-attenuation areas. Enhancing peripheral rim was found in four cases and some solid portions at the periphery or adjacent to the septa were found in all cases. Two patients who had follow-up US and CT without treatment showed enhancing solid portions, changing to hypodense as the tumor grew. When compared with the pathologic findings, US showed a more accurate representation of internal architecture than did CT. Familiarity with these US and CT findings of UES of the liver will be helpful in the differential diagnosis of primary hepatic tumors in childhood.

Adult↗
PubMed1994

Doppler sonography of deep cavernosal artery of the penis: variation of peak systolic velocity according to sampling location.

To determine if there are significant variations in the peak systolic velocity of cavernosal arteries according to the Doppler sampling location, Doppler sonography was performed in 32 patients with erectile dysfunction and 15 control patients. Doppler spectral waveforms were obtained at proximal and distal locations in cavernosal artery. The peak systolic velocity of the cavernosal artery was 39.0 +/- 11.2 cm/sec in proximal portion and 20.0 +/- 5.6 cm/sec in distal portion in patients with erectile dysfunction. In control patients, the peak systolic velocity was 39.8 +/- 8.0 cm/sec in proximal portion and 21.3 +/- 5.5 cm/sec in distal portion. The peak systolic velocity of the cavernosal artery varies significantly according to the sampling location in patients with erectile dysfunction as well as in control patients. Our study demonstrated that the sampling location needs to be standardized in performing Doppler sonography of the cavernosal arteries, and we propose the proximal cavernosal artery where it angles posteriorly as the standardized sampling location.

Adult↗
PubMed1994

Preembolization functional evaluation in supratentorial cerebral arteriovenous malformations with superselective intraarterial injection of thiopental sodium solution.

Superselective intraarterial injections of thiopental sodium solution for evaluation of local brain function were performed before embolization in 38 consecutive patients with supratentorial arteriovenous malformations to evaluate the role of the test using thiopental sodium solution. Thiopental sodium (30-50 mg) was injected in 68 arteries (44 middle cerebral arteries, 13 anterior cerebral arteries, 7 posterior cerebral arteries, 3 external carotid arteries, and 1 thalamo-perforating artery) through superselective microcatheters just before the injection of cyanoacrylate mixture for the embolization. The test was negative in 57 arteries and there were neurologic dysfunctions in 3 of them after embolization. The neurologic deficits in these cases were caused by reflux of embolic material, spasm of the main arterial trunk, or neglected mild sensory change, respectively, and there was no real false-negative test. The embolization could not be performed due to positive test in 9 arteries. Two arteries with positive tests but acceptable symptoms were embolized and the same neurologic deficits developed immediately after embolization. There was no local arterial complication by an injection of the thiopental sodium solution. All neurologic deficits caused by positive tests developed immediately and were completely relieved within 5 min without specific management. Superselective intraarterial injection of thiopental sodium solution is a safe and reliable test for the evaluation of local brain function before embolization of supratentorial arteriovenous malformations.

Adolescent↗
PubMed1993

Radiological evaluation of pulmonary vein obstruction including two examinations by magnetic resonance imaging.

Congenital obstruction of the pulmonary vein without anomalous drainage can cause long-standing pulmonary congestion and pulmonary arterial hypertension, and it may include stenosis of individual pulmonary veins and pulmonary vein atresia. We reviewed seven cases of pulmonary vein obstruction, five of which were accompanied by other cardiac anomalies. Right pulmonary veins were involved in all seven cases; one case was bilateral. Pulmonary veins were occluded totally in five and partially in three lungs. Diagnostic pulmonary catheterization and angiography were performed. Chest radiographs of total occlusion cases showed decreased lung volume, features of pulmonary edema, interstitial lesions, and pleural changes, which were quite specific, whereas pulmonary venous dilatation was the dominant finding in partial obstruction cases. Pulmonary perfusion scan (n = 3) showed total perfusion defects in the cases with total occlusion of pulmonary veins. Magnetic resonance (MR) imaging (n = 2) demonstrated totally occluded pulmonary veins at the venoatrial junction in two lungs and membranous focal obstruction in one lung. Two children underwent pneumonectomy and had the diagnosis histologically confirmed. Although catheterization and angiography are essential for the diagnosis of pulmonary vein obstruction, MR imaging is a useful adjunct.

Adolescent↗
PubMed1993

Endodermal sinus tumour associated with benign teratoma of the common bile duct.

We report a 5-year-old boy with endodermal sinus tumour associated with benign cystic teratoma of the common bile duct (CBD). To our knowledge, there has been one case of teratoma of the CBD in the English literature with no morphological or radiological description. Our case presented a lobulated polypoid mass obstructing the distal CBD on sonography and computed tomography, which resembled the botryoid masses of rhabdomyosarcoma.

Child, Preschool↗
PubMed1993

Perforation complicating balloon dilation of esophageal strictures in infants and children.

PURPOSE: The authors retrospectively reviewed their experience with balloon dilation of esophageal strictures in infants and children to determine the prevalence of esophageal perforation during this procedure. MATERIALS AND METHODS: Balloon dilation was performed in 32 patients with esophageal stricture due to either congenital or postoperative stenosis. The total number of procedures was 141; each patient underwent one to 12 procedures. RESULTS: Four cases of esophageal perforation occurred during balloon dilation and were detected immediately after the procedure. Perforation in three of these patients was treated nonoperatively with parenteral fluid and antibiotics, and one patient was treated surgically with resection and creation of an anastomosis. The clinical course after treatment was favorable in all cases. CONCLUSION: Although esophageal perforation during balloon dilation of benign strictures has been reported as a rare complication, four perforations were observed in 32 patients. Esophageal perforation can occur in infants and children more frequently than previously reported.

Catheterization↗
PubMed1992

Inflammatory pseudotumor of the lung manifesting as a posterior mediastinal mass.

A case of inflammatory pseudotumor of the lung in a 6-year-old boy is presented. The respiratory illness presented as a mycoplasma pneumonia and there had been a similar episode of mycoplasma pneumonia one and a half years previously. Computed tomography revealed a large, calcified right posterior mediastinal mass and exploratory thoracotomy revealed a large posterior mediastinal mass that had an endobronchial component and grew exophytically from the lung. The present case suggests that inflammatory pseudotumor of the lung can manifest as a mediastinal mass and could be associated with mycoplasma pneumonia infection.

Child↗
PubMed1992

Inflammatory bowel disease in children--clinical, endoscopic, radiologic and histopathologic investigation.

This paper reviews our five years' clinical experience (1987 to 1991) of 22 patients with inflammatory bowel disease (IBD). There were 12 patients with Crohn's disease and 10 patients with ulcerative colitis. The mean age at diagnosis was 8.7 years (2 to 14 years). Clinical impressions before referral were chronic diarrhea in 11, irritable bowel syndrome in 5, colon polyp in 4, lymphoma in 3, intestinal tuberculosis in 2, amoebic colitis in 2, ulcerative colitis in 2 children and other diseases. The mean interval from the onset of symptoms to the diagnosis of IBD was 18 months. Diagnosis of Crohn's disease was delayed for more than 13 months in 8 (67%), whereas that of ulcerative colitis was delayed for more than 13 months in 4 (40%). Diarrhea (50%), abdominal pain (36%) and rectal bleeding (36%) were the three most frequent presenting complaints of IBD. Moderately severe abdominal pain was a more common chief complaint in Crohn's disease (58%) than in ulcerative colitis (10%). Hematochezia (90% vs 17%) and moderately severe diarrhea (90% vs 75%) were more common gastrointestinal manifestations in ulcerative colitis than in Crohn's disease. The associated extraintestinal manifestations were oral ulcer in 7, arthralgia in 11 and arthritis in 4, skin lesions in 2, eye lesions in 2 and growth failure in 9 patients. Of 12 children with Crohn's disease, granuloma was found in 5, aphthous ulcerations in 8, cobble stone appearance in 8, skip area or asymmetric lesions in 6, transmural involvement in 7, and perianal fistula in 3. Among 10 children with ulcerative Colitis, there were crypt abscess in 8, granularity or friability in 10 and rectosigmoid ulcerations with purulent exudate in 8 children. The main sites of involvement in children with Crohn's disease were both the small and large bowels in 7 (58%), small bowel only in 2 (16%), and colon only in 3 (25%). Terminal ileum involvement was seen in 75% of Crohn's disease cases. The main sites of involvement in children with ulcerative colitis were total colon in 4 (40%), up to the splenic flexure in 2 (20%), rectosigmoid in 3 (30%) and rectum only in one (10%). Medical treatment including sulfasalazine, and systemic or topical steroid was administered initially in most patients. Seven of 12 patients with Crohn's disease and 2 of 10 patients with ulcerative colitis were operated on.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1991

Diffuse intestinal arteriovenous malformation in a child.

Mesenteric arteriovenous fistulas or arteriovenous malformations of the intestine are relatively rare, especially in the form of diffuse disease. We describe a case of diffuse intestinal arteriovenous malformation associated with congestive heart failure and cutaneous hemangioma.

Arteriovenous Malformations↗
PubMed1990

Caroli disease: central dot sign in CT.

Two adults with communicating cavernous ectasia of the biliary tract (Caroli disease) are described. Both patients had the pure form of the disease, characterized by saccular dilatation of intrahepatic bile ducts, multiple intrahepatic calculi, absence of portal hypertension, and associated cystic renal disease. Computed tomographic (CT) scans of the liver showed tiny dots with strong contrast enhancement within dilated intrahepatic bile ducts (the central dot sign). These intraluminal dots on CT scans corresponded to intraluminal portal veins on sonograms, findings indicating portal radicles surrounded by dilated intrahepatic bile ducts.

Adult↗
PubMed1989

Leptospirosis of the lung: radiographic findings in 58 patients.

Leptospirosis is the disease produced by any of the group of spirochetes of the genus Leptospira. The main organs involved are the liver, central nervous system, kidneys, skeletal muscle, and lungs. Thirty-seven (64%) of 58 patients with leptospirosis, proved by positive serology, had pulmonary radiographic findings. Three radiographic patterns were evident: (1) 21 (57%) of the 37 patients had small nodular densities, (2) six (16%) had large confluent areas of consolidation, and (3) 10 (27%) had diffuse, ill-defined, ground-glass density. Serial radiographs showed a tendency for the nodular pattern to be followed by confluent consolidation and/or ground-glass density. Abnormalities were bilateral, nonlobar in all cases, and had a marked tendency toward peripheral predominance. Pulmonary abnormalities resolved within 15 days, except in eight patients who died because of respiratory failure (six patients) or other causes (two patients). In order to correlate pathology with the radiographic findings, Leptospira, isolated from a patient, was injected intraperitoneally into 20 guinea pigs. All lungs from the guinea pigs showed petecheal hemorrhage, which progressed to large confluent areas of hemorrhage. The typical pulmonary radiographic findings of leptospirosis are compatible with the multifocal pulmonary hemorrhage seen in the guinea pigs.

Adult↗
PubMed1987

Mediastinal tuberculous lymphadenitis: CT manifestations.

An analysis was done of computed tomographic (CT) scans of 23 Korean patients who had presented with a mediastinal or hilar mass on plain chest radiographs and had subsequently been found to have tuberculous lymphadenitis. Most patients were young adults. Findings of pulmonary tuberculosis were seen on plain radiographs in 14 patients. On CT, findings were of an overwhelming preponderance of involvement of the right paratracheal and tracheobronchial nodes. After injection of contrast medium, nodes larger than 2 cm in diameter invariably showed central areas of relative low density and peripheral rim enhancement. Enhanced walls were usually irregular in thickness. Some smaller nodes did not show low-density areas, but instead showed varying degrees of homogeneous enhancement. Although metastatic nodes can be of low density, experience in this study suggests that mediastinal lymphadenopathy in a young adult with the CT findings described above is characteristic enough to support a diagnosis of tuberculosis.

Adolescent↗