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John R Sty

Publications and source records attributed to John R Sty.

4 recordsLinked to original sources
PubMed2006

Genitourinary imaging techniques.

In the current era of pediatric uroradiology, use of nuclear medicine, ultrasonography, CT, and MRI has been valuable in the identification and management of genitourinary diseases. Excellent information about the renal parenchyma and renal function is currently attainable with current cross-sectional imaging techniques that can identify tissue differentiation of lesions, distinguish dilatation of the pelvocalyceal system, and determine margins of the kidney and perirenal space. Invasive angiography is limited in application specifically to vascular diseases, although they are uncommon in childhood. Because of these newer techniques, intravenous urography has lost its position as the "cornerstone" of urinary tract imaging and is used mainly to identify pathologic conditions of the ureters.

Child↗
PubMed2003

Traumatic low attenuation subdural fluid collections in children younger than 3 years.

OBJECTIVE: To determine the time course for the development of posttraumatic nonhemic subdural fluid collections in infants and young children. DESIGN: Retrospective consecutive case series during 16 years. Patients Fifty-five head trauma patients younger than 3 years with low attenuation subdural fluid on computed tomography. MAIN OUTCOME MEASURE: Time after head trauma when low attenuation fluid first becomes visible. SETTING: Regional pediatric medical center. RESULTS: The initial visualization of low attenuation subdural fluid was within 4 days of the trauma for 44 of the patients. The mean +/- SD size of the subdural fluid collections when first identified was 4.6 +/- 2.0 mm (range, 2-12 mm), and the maximum observed size was 7.7 +/- 3.5 mm (range, 3-21 mm). The mean +/- SD time after injury until the maximum observed size was 16 +/- 18 days (range, 0-87 days). Low attenuation subdural fluid and high attenuation intracranial hemorrhage coexisted on at least 1 computed tomographic study during the first week after the trauma in 42 (81%) of the 52 patients with hemorrhage. CONCLUSION: Low attenuation subdural fluid collections (distinct from clotted blood) in infants and young children with head injuries most often develop during the first week after the traumatic event.

Atrophy↗
PubMed2003

Increased diagnosis of Lemierre syndrome and other Fusobacterium necrophorum infections at a Children's Hospital.

OBJECTIVE: To assess the apparent increase in the diagnosis of Lemierre syndrome (LS) and other Fusobacterium necrophorum infections at a large children's hospital. Infections with F necrophorum ranged from peritonsillar abscess to potentially fatal LS. LS is an oropharyngeal infection characterized by septic thrombophlebitis of head and neck veins, complicated by dissemination of septic emboli to pulmonary and systemic sites. METHODS: Review of the medical and laboratory records was conducted of all patients who were seen at or admitted to the Children's Hospital of Wisconsin with the diagnosis of LS and/or isolation of F necrophorum from a clinical specimen between January 1995 and January 2002. RESULTS: During the 7-year period of the study, there was an increase in the isolation of F necrophorum from patients who were seen at Children's Hospital of Wisconsin, as well as the number of cases of LS. There was 1 isolation of F necrophorum from clinical specimens per year from 1996 to 1999, which increased to 10 isolates of the organism from January 2000 to January 2002. During the most recent period, January 2001-January 2002, 5 cases of LS were diagnosed, a distinctive entity not recognized previously at the institution. CONCLUSIONS: The cause for the recent increase in the number of serious infections caused by F necrophorum infection diagnosed at our institution is unclear but does not seem to be related to changes in microbiologic techniques or patient demography. We speculate that it could be attributable, in part, to alterations in antibiotic usage patterns in our region. Clinicians need to be aware of the increasing clinical importance of F necrophorum infections and the life-threatening nature of LS.

Adolescent↗