Biomedical subjects
F L Haar
Publications and source records attributed to F L Haar.
Correlation between computed tomography and intracranial pressure monitoring in acute head trauma patients.
A preliminary retrospective correlation between computed tomographic scans and intracranial pressure (ICP) monitored was performed for 21 patients. No patient with a normal CT scan had elevated ICP. The lowest correlation was noted with slit ventricles; the highest, with dilatation of the contralateral temporal horn.
Complication of linear skull fracture in young children.
The development of a leptomeningeal cyst following an otherwise uncomplicated linear skull fracture in a young child may result in a sizable cranial defect and irreversible neurological deficit months or years later. This complication most often follows parietal fractures but is also seen after occipital fractures or traumatic suture diastases. An underlying dural tear is a prerequisite to its subsequent development. Neurological deficit may be avoided by early diagnosis, surgical excision, dural closure, and cranioplasty. Early diagnosis depends on obtaining a skull roentgenogram four to six months following the original injury in any child where examination of the scalp and skull suggests and underlying expanding fracture.
Hydrocephalus resulting from superior vena cava thrombosis in an infant. Case report.
The authors report an unusual case of superior vena cava thrombosis in an infant who subsequently developed communicating hydrocephalus; they also review previously reported cases of dural sinus hypertension, and separate them into two groups. Patients in the first group develop hydrocephalus and those in the second develop a pseudotumor-like syndrome. The former patients tend to have generalized increase in intracranial venous pressure while the latter have a normal pressure in some major intracranial venous structure(s). The absence of venous cushioning of the choroid plexus pulse wave is proposed as the cause of ventricular enlargement in the former group. In addition, patients in the large-ventricle group were younger than patients in the small-ventricle group.
Topical lidocaine in treatment of cerebral vasospasm.
Relief of segmental spasm in monkeys was obtained using topical lidocaine after experimental subarachnoid hemorrhage. Dilatation of spastic vessels was also observed in patients following lidocaine application during operations. The segments of arteries approximating the clipped aneurysm were noted to be dilated angiographically in certain cases.
Actinomycotic wound infection following craniotomy: case report and review of literature.
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The usefulness of CT scanning for subdural hematomas.
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1.5-T MR imaging of pituitary microadenomas: technical considerations and CT correlation.
Thirty-seven patients with suspected pituitary tumors were evaluated prospectively with MR imaging at 1.5 T. MR detected a microadenoma at its correct location in all eight patients who underwent transsphenoidal surgery, while CT showed a focal abnormality in the correct location in only four of the eight patients. In patients who were clinically and endocrinologically considered to harbor a microadenoma, MR detected a focal pituitary signal abnormality in 83% and CT demonstrated a focal density abnormality in 42%. Infundibular displacement, focal gland convexity, and sellar-floor abnormality were seen equally well with CT and MR. MR imaging protocol included sagittal T1-weighted spin-echo, coronal inversion-recovery, and coronal spin-echo or cardiac-gated spin-echo images. Although inversion-recovery images were superior in detecting focal pituitary lesions, some microadenomas were better seen on T2-weighted images. Cardiac-gated spin-echo images showed focal pituitary lesions better than ungated images did. Our technique demonstrates MR's superior sensitivity to CT in detecting a pituitary microadenoma.
High-resolution MR imaging of juxtasellar meningiomas with CT and angiographic correlation.
The purpose of this study was to compare the relative merits of MR imaging, CT, and angiography in the preoperative evaluation and postoperative follow-up of patients with juxtasellar meningiomas. High-resolution MR studies in nine patients with juxtasellar meningiomas were evaluated and compared with CT and angiography. The techniques were compared for the evaluation of suprasellar, parasellar, and intrasellar extension, as well as for vascular displacement or encasement, postoperative recurrence or residual calcification, and bone changes. MR provided additional information considered significant by the neurosurgeon when compared with CT, and MR was considered superior to CT in the juxtasellar area. Although MR does not obviate angiography, in many cases angiographic findings were predictable by MR.