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Seong Jin Park

Publications and source records attributed to Seong Jin Park.

12 recordsLinked to original sources
PubMed2007

High-resolution sonography for nasal fracture in children.

OBJECTIVE: We describe the sonographic findings of nasal fracture in children, and we evaluate the diagnostic value of sonography as compared with conventional radiography and clinical findings to determine whether sonography can be a primary technique for evaluating nasal fracture in children. MATERIALS AND METHODS: Conventional radiographs and sonographic scans were obtained in 26 consecutive children with nasal trauma who were seen at our hospital from March 2003 to March 2005. There were five girls and 21 boys, and their ages ranged from 1 year 9 months to 15 years 11 months (mean age, 9.9 years). The following sonographic scans (HDI-5000 unit with a 7-15-MHz linear array transducer) were used to evaluate the nasal bone at different levels: a midline longitudinal image; axial scans of the nasal bones at the upper, middle, and lower levels; images of the nasal septum; and transverse and longitudinal scans of both lateral walls. Ten children also underwent CT. RESULTS: Conventional radiographs depicted 14 (54%) of 26 fractures. Sonographic scans were able to show all the fracture lines. One case was diagnosed as an old nasal fracture on the basis of a physical examination, even though a visible fracture line was seen on sonography. The sonographic findings of nasal fracture were disruption of the bone continuity with or without separation of the fractured segment (7/26), displacement of the bone segment as being depressed or overriding (20/26), associated septal deviation (7/26), and separation of the pyriform aperture of the maxilla and nasal bone (2/26). The associated findings were soft-tissue edema and hypoechoic hematoma near the fracture lines in 25 cases. The fractures involved both sides of the nasal bones in 11 of 26 cases, the midline part of the bones in six of 26 cases, and the unilateral paramedian or lateral part of the bones in 12 of 26 cases. Among the 10 CT scans, one CT scan did not depict the fracture, showing only soft-tissue swelling, and one scan showed fractures of the orbital floor and maxilla. CONCLUSION: Sonography can be a primary diagnostic technique for evaluating nasal fracture in children. It inflicts no radiation, provides various imaging planes without positional change, and can be used to evaluate the cartilaginous septum. Potential pitfalls are the nasofrontal suture, the junction between the nasal bone and the pyriform aperture of the maxilla, the vascular groove, and the presence of an old fracture. CT can be used in addition to sonography in cases of suspected complex facial bone trauma.

Adolescent↗
PubMed2006

[Intraductal ultrasonography for the selection of self expandable metal stent in extrahepatic bile duct carcinoma].

BACKGROUND/AIMS: Endoscopic stent insertion with self expandable metal stent (SEMS) is one of the standard palliative treatments for the patients with unresectable bile duct carcinoma. The aim of this study was to determine whether detection of longitudinal spread of extrahepatic bile duct carcinoma by intraductal US (IDUS) would be helpful in the selection of metal stent for the palliative drainage in bile duct carcinoma. METHODS: Seventeen patients with histologically proven unresectable extrahepatic bile duct carcinoma who underwent endoscopic retrograde cholangiography with IDUS were included. Longitudinal cancer extension along the bile duct was determined and, then, compared with the cholangiographic image. The type and length of SEMS was selected based on IDUS findings. RESULTS: IDUS demonstrated more extensive tumor spread than ERC in 7 of 17 (41.2%) patients with the hepatic side of strictures and in 7 of 16 (43.8%) patients with the duodenal side of strictures. Five of 17 (29.4%) patients have changed the plan of endoscopic biliary drainage with SEMS after IDUS. There was no early dysfunction associated with endoscopic biliary drainage. CONCLUSIONS: IDUS prior to biliary drainage would be useful in demonstrating longitudinal extension of extrahepatic bile duct carcinoma. It has a potential role in helping stent selection and identifying factors which predict early stent dysfunction.

Bile Duct Neoplasms↗
PubMed2004

Dynamic equilibrium between a supramolecular capsule and bowl generated by inter- and intramolecular metal clipping.

The metal-induced self-assembly of a resorcin[4]arene derivative 1 that has four pyridine units as pendent groups and two equivalents of [M(dppp)(OTf)(2)] (M=Pd, Pt) results in a dynamic equilibrium between an interclipped supramolecular capsule 3 and an intraclipped bowl 4 in nitromethane, although the interclipped capsule 3 is formed as a sole adduct in chloroform/methanol and the intraclipped bowl 4 is formed exclusively in an aqueous phase. This demonstrates how metal-induced self-assembly can be tuned by subtle changes in the solvent system. The coexistence of the two structures in nitromethane was characterized by NMR spectroscopy and coldspray ionization mass spectrometry (CSI-MS). The crystal structure of the interclipped capsule 3 b, which is composed of two units of ligand 1 and four Pt(II) ions, reveals the capsule cavity to have nanoscale dimensions of 15x20 A. NMR spectra show that the dynamic equilibrium between 3 and 4 is dependent on concentration and temperature. Temperature-dependent (1)H NMR spectroscopy was carried out from 273 to 343 K to verify the thermodynamic parameters that control the dynamic equilibrium process; the conversion from the interclipped supramolecular capsule 3 a to the intraclipped bowl 4 a is entropically favored and enthalpically disfavored. The rotational barrier of the restricted rotation of pyridine units in the intraclipped bowl 4 was determined by line-shape analysis.

Journal Article↗
PubMed2004

Diagnosis of pelvic congestion syndrome using transabdominal and transvaginal sonography.

OBJECTIVE: We prospectively evaluated transabdominal and transvaginal sonographic findings of patients with pelvic congestion syndrome and compared them with those of healthy volunteers. SUBJECTS AND METHODS. We examined 32 patients with pelvic congestion syndrome and 35 control subjects. Using transabdominal sonography, we evaluated the ovarian veins for diameter and flow direction, presence of pelvic varicocele, diameter of the pelvic veins, change of the duplex waveform during the Valsalva's maneuver, volume of the uterus, and presence of polycystic changes in the ovaries. We compared and statistically analyzed each parameter in the pelvic congestion syndrome group and in the control group. RESULTS: The mean (+/- SD) diameter of the left ovarian vein was 0.79 +/- 0.23 cm in the pelvic congestion syndrome group and 0.49 +/- 0.15 cm in the control group (p = 0.000). Reversed caudal flow in the left ovarian vein was present in 22 of 22 patients and in four of 16 control subjects. Pelvic varicoceles were present in all patients with pelvic congestion syndrome and in six control subjects. The mean diameter of the left pelvic vein was 0.68 +/- 0.21 cm in the pelvic congestion syndrome group and 0.42 +/- 0.19 cm in the control group; the mean diameter of the right pelvic vein was 0.64 +/- 0.24 cm in the pelvic congestion syndrome group and 0.35 +/- 0.14 cm in the control group (p = 0.000). Polycystic changes of the ovary were present in 13 patients with pelvic congestion syndrome (40.6%) and four control subjects (11.4%). CONCLUSION: Sonographic findings of pelvic congestion syndrome were dilated left ovarian vein with reversed caudal flow, presence of varicocele, dilated arcuate veins crossing the uterine myometrium, polycystic changes of the ovary, and variable duplex waveform during the Valsalva's maneuver. Combined transabdominal and transvaginal sonography are potentially useful as a noninvasive screening tool for determining which patients with chronic pelvic pain may benefit from selective ovarian venography and transcatheter embolization.

Adult↗
PubMed2003

Modulation of a supramolecular bowl and pot by changing solvent systems and/or metal/ligand ratios.

A resorcin[4]arene-based ligand 2 a with four pyrimidine substituents at the upper rim was synthesized, and the generation of different metal-mediated superstructures from the same ligand and metal ions utilizing the unfavorable incorporation of the third and fourth Pd(II) ions to ligand 2 a was investigated. The supramolecular bowl 3 a, which comes from a 1:2 combination of ligand 2 a and [Pd(en)(NO(3))(2)], was obtained in water even though excess of Pd(II) complexes were employed. By adding methanol, the supramolecular pot 4 gradually formed, which was the major product when the ratio of mixed solvent reached methanol/water=5:1 (v/v). Host-guest complexation phenomena of 3 a toward several aromatic carboxylates were demonstrated by isothermal titration calorimetry (ITC) and by (1)H NMR spectroscopy; both the enthalpy gain from electrostatic and hydrophobic interactions, and the entropy gain from desolvation cooperatively contribute to the binding of anionically charged guests. The crystal structure of supramolecular pot 4 shows direct evidence for the hydrogen bonding between water and the aromatic pi electrons in the solid state. The modulation between supramolecular bowl 3 a and pot 4 was also made possible by changing the metal/ligand ratios in aqueous methanol solution as well as by varying the water content of the mixed solvent.

Journal Article↗
PubMed2003

Failure on attempted removal of a Gamma nail in two young patients.

We experienced failures in attempting to remove a Gamma nail and a long Gamma nail, both of which were used for fixation of a subtrochanteric fracture in two young patients. We suspect that new bone forms in the notch, which is located beneath the screw thread in the lag screw, and causes jamming of the lag screw in young patients after fracture consolidation.

Adolescent↗
PubMed2002

Pseudoaneurysm of the superficial femoral artery after closed hip nailing with a Gamma nail: report of a case.

Pseudoaneurysm of the femoral artery after internal fixation of a trochanteric fracture is caused primarily by overpenetration of the drill bit or screws. We report a case of pseudoaneurysm of the superficial femoral artery after insertion of a Gamma nail. A probable cause for this injury is adduction and internal rotation of the involved limb. During the distal interlocking procedure, this maneuver endangers the superficial femoral artery by abutment of the femoral vessels to the femur. It is recommended that the limb be placed in a neutral position during preparation of the interlocking hole.

Aged↗
PubMed2002

Nutcracker syndrome in children with orthostatic proteinuria: diagnosis on the basis of Doppler sonography.

OBJECTIVE: To evaluate the Doppler sonographic findings of the left renal vein in children with orthostatic proteinuria in comparison with healthy children and to propose more reliable sonographic criteria for diagnosing nutcracker syndrome in children. METHODS: Doppler sonographic findings in 47 children with orthostatic proteinuria and in 27 healthy control subjects were compared. The diagnosis of orthostatic proteinuria was made on the basis of clinical and laboratory findings. The peak velocity and anteroposterior diameter were measured at the hilar and aortomesenteric portions of the left renal vein. The means +/- 2 SD of the anteroposterior diameter ratio and peak velocity ratio between the 2 portions were calculated for control subjects and used as the cutoff levels for nutcracker syndrome. RESULTS: The peak velocity ratios between aortomesenteric and hilar portions were 5.21+/-2.55 in the patient group and 2.57+/-0.70 in the control group. The anteroposterior diameter ratios between the 2 portions were 5.31+/-2.65 in the patient group and 2.77+/-0.69 in the control group. We set the cutoff level of anteroposterior diameter and peak velocity ratios for the diagnosis of nutcracker syndrome at mean +/- 2 SD of the value for the control group (3.98 for the peak velocity ratio and 4.16 for the anteroposterior diameter ratio). When these cutoff levels were applied, the patients with orthostatic proteinuria had abnormal levels of anteroposterior diameter in 27 (57.4%) of 47, peak velocity in 30 (63.8%) of 47, and both in 23 (48.9%) of 47. CONCLUSIONS: Nutcracker syndrome may be an important cause of orthostatic proteinuria in children. Doppler sonography of the left renal vein may be a useful screening tool in patients with suspected orthostatic proteinuria to evaluate whether the cause is nutcracker syndrome.

Adolescent↗
PubMedDate not supplied

Traumatic bowel perforation: analysis of CT findings according to the perforation site and the elapsed time since accident.

Abdominal CTs of 57 patients with bowel perforation after blunt abdominal trauma were retrospectively analyzed to determine: the diagnostic accuracy of the perforation site, and the differential findings according to the elapsed time from the trauma. Diagnostic accuracy of the perforation site was as follows: duodenum (100%), jejunum (81%), jejunoileal junction (100%), ileum (93%), and colon (20%). Extraluminal air was the only significant differential findings according to the elapsed time, and was seen more commonly on late stage of bowel perforation (P<.05).

Abdominal Injuries↗
PubMedDate not supplied

Multislice CT cholangiography using thin-slab minimum intensity projection and multiplanar reformation in the evaluation of patients with suspected biliary obstruction: preliminary experience.

Thirty-three patients with suspected biliary obstruction were prospectively evaluated with multislice CT cholangiography using thin-slab minimum intensity projection (MinIP) and multiplanar reformation (MPR) to determine its usefulness and to compare with the comparative studies of endoscopic retrograde cholangiography (ERC), magnetic resonance cholangiography (MRC), or percutaneous transhepatic cholangiography (PTC). CT cholangiography made correct diagnoses in all biliary obstructions except in two patients with common bile duct stones. The correspondence with the comparative study was 93.9%. Multislice CT cholangiography may be favorable in noninvasive evaluation of biliary obstructions.

Bile Duct Diseases↗