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Biomedical subjects

G Valvassori

Publications and source records attributed to G Valvassori.

13 recordsLinked to original sources
PubMed1988

Brain morphology in schizophrenia: a 2- to 5-year CT scan follow-up study.

In order to investigate whether structural brain changes in schizophrenia are static or progress in time, 17 schizophrenic patients were examined by computed tomography (CT) between 2 and 5 years after the initial scan. There was no change in cerebral ventricular size or degree of cortical atrophy over this period. The stability of CT scan measures of cerebral atrophy in individual schizophrenic patients confirms the hypothesis of the early appearance of structural brain abnormalities in schizophrenia as formulated in previous cross-sectional studies. Furthermore, the pathological process responsible for the CT finding of cortical or central atrophy does not seem to progress nor to reverse itself in young schizophrenic patients.

Adolescent↗
PubMed1986

Skull base lesions: a classification and surgical approaches.

An anatomic classification of lesions affecting the skull base is proposed according to which this region can be divided into a midline compartment and two lateral compartments: a petrotemporal and an infratemporal. The majority of lesions studied radiographically in 56 patients were confined to one of these anatomic subdivisions. The advantages of such a classification are discussed. The surgical approaches to these compartments and to the anterior middle and posterior cranial fossae are described relative to the lesions we have encountered.

Adolescent↗
PubMed1984

An algorithm for neurotologic disorders.

In the evaluation of patients with complaints of dizziness, hearing loss, and/or tinnitus, the primary objective is to determine the site of the lesion. An accurate localization of the lesion is important for selecting the most appropriate radiologic study. The information obtained from the vestibular and audiometeric evaluations identifies the site of the lesion accurately. For the vestibular evaluation we use photoelectric nystagmography (PENG) and the Torok monothermal differential caloric test. The initial audiometeric evaluation consists of a pure-tone audiogram and speech discrimination scores. Additional audiometric site-of-lesion tests and ABR are used selectively as the diagnostic yield of these tests does not significantly add to the information already obtained from the vestibular evaluation. If the lesion is suspected to lie in the middle ear or internal auditory canals, we use pluridirectional tomography. For further delineation of lesions confined to the internal auditory canal we use pneumo-CT. For suspected morphologic lesions of the posterior fossa we use thin-section CT with enhancement. Review has proved useful in defining petrous apex and skull base lesions. CT-rBBC studies have proved valuable in objectively demonstrating a deficient perfusion of the brain. The vascularity of certain lesions such as glomus tumors can be satisfactorily confirmed by this technique.

Adult↗
PubMed1978

The evaluation of occipital lobe atrophy by computerized tomography before consideration of vertebral artery reconstructive surgery.

Occipital lobe atrophy can be identified on CT. In a review of 90 selected cases with brain ischemia symptoms, 45 cases were found to have hindbrain ischemia with symptoms of vertigo and/or 'blurred vision.' Ten cases (22%) had normal CT studies and 35 cases (78%) had abnormal CT studies. The CT brain scan of the cerebellum and occipital lobes has a place in determining whether a patient with clinical hindbrain ischemia is a candidate for angiography and vertebral artery bypass surgery.

Adolescent↗
PubMed1978

Computed axial tomography in otorhinolaryngology.

The value of computed tomography in ORL and its applications have been briefly discussed. Better soft tissue detail and its relationship to bony structures is obtained. At the present time this modality may be utilized as a screening test in some suspected cases or as an adjunct of conventional methods. With the technical refinements that are constantly being made, better diagnostic information will be obtained in CT scanning.

Brain Neoplasms↗
PubMedDate not supplied

Vertebrobasilar insufficiency.

Permanent or transient reduction of the blood flow to the brain is often responsible for dizziness and occasionally sensorineural hearing loss. So far the diagnosis of this condition has been made by angiography, either carotid or vertebral arteriography, but there is a justified reluctance of subjecting unselected patients to this invasive procedure. It is the purpose of this paper to present a new approach to the diagnosis of cerebral vascular insufficiency based on a three-step protocol. The two initial steps are formed by noninvasive techniques and may be used for the selection of those cases requiring additional diagnostic procedures. 1) Cerebral hemodynamic evaluation provides a physiologic assessment of the direct carotid and indirect carotid and vertebral blood flow. It includes ocular plethysmography and ophthalmodynamometry obtained with the patient supine and erect, without and during carotid compression. 2) Computerized tomography allows an evaluation of the brain substance and of the changes produced by vascular insufficiency such as brain atrophy, infarcts and encephalomalacia. A new form of radiographic assessment based on a dynamic evaluation of regional blood flow will be introduced in this paper. 3) Carotid and vertebral arteriograms are performed only on these cases demonstrating a significant cerebral vascular insufficiency by the previous tests and in cases where corrective surgery is contemplated.

Aged↗
PubMedDate not supplied

Central vestibular signs, posterior fossa pathology and computerized tomography-regional blood brain circulation.

Central vestibular signs are sensitive indicators of lesions in the posterior fossa. With the availability of computerized tomography and computerized tomography-regional blood brain circulation, the identification of suspected retrolabyrinthine lesions has improved considerably. This is a report about the reliability of central vestibular signs in predicting posterior fossa lesions.

Adolescent↗