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At least 667 records · Page 37Linked to original sources
PubMed1996

A clinical study of parenchymal and subdural miniature strain-gauge transducers for monitoring intracranial pressure.

OBJECTIVE: Previous studies have shown that a new strain-gauge MicroSensor (Codman/Johnson & Johnson Professional, Inc., Randolph, MA) for measuring intracranial pressure (ICP) performs well in the intraventricular space. We hoped to evaluate the MicroSensor in the subdural space and the brain parenchyma, because ICP is often measured in these compartments when the ventricles are difficult to cannulate. METHODS: Fifteen patients had simultaneous recordings of ICP from an externally transduced fluid-filled subdural catheter, a MicroSensor placed within the subdural catheter, and a nearby MicroSensor placed intraparenchymally in the right frontal lobe. RESULTS: The total number of valid simultaneous recordings of ICP was 95,946. A highly significant correlation was found between the tissue MicroSensor ICP (TMICP) and the subdural MicroSensor ICP (SMICP) (n = 95,946; r = 0.89; P < 0.00005), the TMICP and the fluid-transduced subdural catheter ICP (r = 0.86, P < 0.00005), and the fluid-transduced subdural catheter ICP and SMICP (r = 0.88, P < 0.00005). The mean simultaneous difference between the TMICP and the SMICP was 0.1 +/- 3.8 mm Hg with no obvious bias. The fluid-transduced subdural catheter ICP was 2.8 +/- 3.9 mm Hg lower than the TMICP and 2.7 +/- 3.9 mm Hg lower than the SMICP (P < 0.0005). The mean zero drifts of the tissue and subdural MicroSensors were 0.312 and 0.475 mm Hg/d, respectively. The tissue MicroSensor recordings showed the best quality wave form with the least damping. CONCLUSION: The strain-gauge MicroSensor is highly accurate and stable in the tissue and subdural spaces.

Brain↗
PubMed2003

[Differential infratentorial brain tumor diagnosis in children].

With the exception of the first year of life, infratentorial brain tumors are more frequent in the first decade than tumors in the supratentorial compartment. In particular these are cerebellar low-grade astrocytomas, medulloblastomas, brainstem gliomas and ependymomas of the fourth ventricle. The morphology on MRI and CT and the mode of dissemination permit differential diagnosis in many cases. To allow correct stratification into different treatments in possibly disseminating malignant brain tumors, knowledge of the status of dissemination is essential, and therefore not only cranial but also spinal MRI is indispensable for staging. If the spinal MRI is performed in the immediate postoperative period, knowledge of the normal non-specific purely postoperative changes, often seen as enhancement in the subdural spinal spaces, is necessary in order to avoid misinterpretation as meningial seeding. The differential diagnosis of pediatric infratentorial brain tumors and the morphology of subdural enhancement are illustrated with typical images. The natural history of the most frequent tumors and its importance for treatment decisions is discussed in light of the literature.

Brain↗
PubMed1993

Subarachnoid fluid collection in infants complicated by subdural hematoma.

In the natural history of infantile extracerebral fluid collections, subarachnoid fluid collection itself is regarded as a benign lesion, and surgical treatment is not indicated. As this condition is age-related and self-limiting, spontaneous resolution can be expected in most cases by 2-3 years of age. However, out of 20 cases of infantile subarachnoid fluid collection in an 8-year period, 3 infants developed subdural hematoma. Infantile subarachnoid fluid collection seems to be prone to complicate subdural hematoma. Surgical treatment should be considered when subarachnoid fluid collection is complicated by subdural hematoma due to arachnoid ruptures or tearing of the bridging veins. Therefore, all patients should be observed closely and measures should be taken to prevent head trauma since it may precipitate subdural hematoma.

Diagnosis, Differential↗
PubMed1999

[Surgical treatment of trigeminal neurinomas].

OBJECTIVE: To investigate the best surgical approach to remove of trigeminal neurinomas (TNs). METHODS: 75 patients with TNs in Huashan Hospital were reviewed retrospectively. RESULTS: In early group (1978 - 1984) conventional intradural approaches were used, and in late group (1985 - 1995) an epidural approach via the skull-base craniotomy was utilized. Total removal of was achieved in 58% (20/35) in the early group and 80% (32/40) (P < 0.05) in the late group. Temporary or permanent cranial nerves morbidities were 62.7%, 37% in the early group and 28.1%, 10% (P < 0.01) in the late group, respectively. CONCLUSIONS: The best surgical approach with microsurgical technique for removal of TNs is epidural approach or epiduro-transduro-transtentorial approach via a skull-base craniotomy except the tumor only confined to the posterior fossa.

Adolescent↗
PubMed1996

[The MR tomographic diagnosis of intra- and paraspinal abscesses].

PURPOSE: Analysis of the MRT signals and their extent from intra- and paraspinal abscesses with reference to predisposing factors, their causes and localisation. PATIENTS AND METHODS: The histories and MRT findings in 34 Patients with intra- and paraspinal abscesses were evaluated retrospectively. Most of the patients (24/34) were older than 50 years. A second peak was below 30 years. RESULTS: 27/34 patients had some underlying disease which predisposed to infection, e.g., diabetes mellitus. The most common causal organisms were Staph. aureus (53%) and streptococci (15%). In 23/34 cases (68%), the abscesses were in the thoraco-lumbar or lumbar region, while only 6/34 occurred in the upper two-thirds of the thoracic spine and only 5/34 in the cervical region. In only 8/34 was the abscess confined to two vertebral lengths; in the remaining patients it was much more extensive. Intraspinal abscesses were about twice as large as the vertebral components and 1.5 times greater than paravertebral abscesses. The age of the abscesses could be estimated approximately from the signals. CONCLUSIONS: Contrast enhanced MRT permits detailed analysis of the compartments and exact estimation of the extent of the lesions and permits accurate monitoring of treatment.

Abscess↗