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Biomedical subjects

B Vande Berg

Publications and source records attributed to B Vande Berg.

25 records · Page 2Linked to original sources
PubMed1993

Intravertebral vacuum cleft: changes in content after supine positioning.

Sequential radiographic and magnetic resonance (MR) imaging examinations were performed in nine patients with an intravertebral vacuum cleft indicative of avascular necrosis. Progressive changes in the content of the cleft occurred within an hour after the patients were placed in a supine position. Initially, the cleft showed a gaslike pattern during extension of the spine, with a radiolucent band on radiographs and a signal void on MR images. Later, the vacuum phenomenon disappeared on radiographs, and a fluidlike high-signal-intensity pattern appeared on T2- or T2*-weighted MR images, suggestive of a slow fluid inflow within the intravertebral cleft. Because the recognition of a vacuum cleft in a collapsed vertebral body helps avoid confusion with malignancy or infection, it is important to search for this in examinations performed immediately after supine positioning.

Aged↗
PubMed1993

Ultrasonographic detection of thickened joint capsules and tendons as marker of dialysis-related amyloidosis: a cross-sectional and longitudinal study.

Dialysis-related amyloidosis is characterized by a beta 2-microglobulin (beta 2M) infiltration of joint synovia, tendons and capsules. We report a cross-sectional ultrasonographic evaluation of supraspinatus tendon and femoral neck capsule thickness in 49 patients on long-term haemodialysis. Ultrasonographic evaluation was repeated 21 +/- 4 (SD) months later in 16 patients. Normal values for the supraspinatus tendon and femoral neck capsule were defined in a group of control subjects without history or signs of joint disease. Among the 49 patients, aged 21-86 (median 59) years, dialysed for 1-228 (median 97) months, 33 had at least one abnormal joint. The prevalence of patients with at least one and at least two abnormal joints, the number of abnormal joints per patient, and the thickness of the supraspinatus tendon and femoral neck capsule increased significantly with dialysis duration (P < 0.001 for all parameters considered). By multiple linear regression analysis, mean thickness of the supraspinatus tendon was positively related to both dialysis duration (P < 0.0001) and age (P = 0.036) independently. All (n = 11) patients with radiological and/or histological evidence of dialysis-related amyloidosis at the time of ultrasonography had thickened supraspinatus tendon and/or femoral neck capsule; which were also thickened in an additional 22 patients without radiological evidence of dialysis-related amyloidosis. Three died within 5-10 months of the ultrasonographic investigation: post-mortem examination of the periarticular tissue confirmed that the detected thickening was due in all three to beta 2M amyloid infiltration.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Benign osteochondromas and exostotic chondrosarcomas: evaluation of cartilage cap thickness by ultrasound.

Ultrasonography (US) enables accurate assessment of the cartilage cap of exostoses. The cartilage cap appears as a hypoechoic layer covering the hyperechoic surface of the calcified part. Measurements of cap thickness with US were compared with measurements performed on pathological specimens in 22 resected exostoses and 2 exostotic chondrosarcomas. The US measurements proved to be very accurate, with a mean measurement error of less than 2 mm for cartilage caps less than 2 cm thick. The detection rate and measurement accuracy of US were higher than with computed tomography (CT) and comparable to magnetic resonance imaging (MRI), which were available in 14 and 10 cases, respectively. US appears to be a good procedure for evaluating the cartilage cap, which is usually thin for a benign exostosis and thick for a malignancy. In addition, other complications--such as bursa formation--are easily recognizable. The sole limitation is that US cannot visualize the cartilage cap when it is inwardly orientated or deeply located in soft tissues, which are both, however, relatively uncommon situations.

Bone Neoplasms↗
PubMed1992

Avascular necrosis of the hip: comparison of contrast-enhanced and nonenhanced MR imaging with histologic correlation. Work in progress.

In 15 hips with typical signs of avascular necrosis of the femoral head on plain radiographs and magnetic resonance (MR) images, gadolinium-enhanced spin-echo and fat-suppressed MR images were obtained and compared with nonenhanced T1- and T2-weighted images. Both enhanced and nonenhanced areas were consistently detected in the abnormal femoral heads. Enhanced areas showed a low signal intensity (SI) on T1-weighted MR images obtained before contrast material was administered and an intermediate to high SI on T2-weighted images. Nonenhanced areas showed an SI either identical (pattern 1) or hypointense (pattern 2) to that of fat on both sequences. Histologic correlation (six resected femoral heads) helped confirm that enhanced and nonenhanced areas corresponded respectively to viable and necrotic tissue. In most cases, SI analysis of nonenhanced T1- and T2-weighted images allows the differentiation of hypervascularized viable tissue from hypovascularized necrotic tissue of the sequestrum.

Adult↗
PubMedDate not supplied

Apparent focal bone marrow ischemia in patients with marrow disorders: MR studies.

OBJECTIVE: We sought to assess with MR the focal bone marrow abnormalities in patients with chronic marrow disorders and acute limb pain. MATERIALS AND METHODS: We investigated and followed with MRI four patients with proliferative or dysplastic marrow disorders presenting with acute but spontaneously resolving hip or thigh pain. RESULTS: Ten focal marrow lesions were demonstrated on T2-weighted images as high signal intensity (SI) areas. They remained undetected on T1-weighted images as they showed a low SI similar to the disease-related low SI of the entire marrow. Postcontrast images demonstrated lack of enhancement in the lesions. Follow-up enhanced MR images showed intense enhancement within the lesions, while unenhanced MR images remained unchanged. Later on, these focal marrow abnormalities completely resolved. These lesions most likely represent bone marrow ischemia, although histological proof is lacking. CONCLUSION: Acute bone pain in patients with bone marrow disorders may be related to focal marrow lesions suggestive of bone marrow ischemia.

Bone Marrow↗