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Biomedical subjects

M G Karnaze

Publications and source records attributed to M G Karnaze.

4 recordsLinked to original sources
PubMed1988

Comparison of MR and CT myelography in imaging the cervical and thoracic spine.

MR imaging and CT myelography were compared in a retrospective study of 38 patients with suspected lesions of the cervical and thoracic spinal canal and cord. Twenty-eight abnormal cases were found, including spondylosis (9), tumors (8), intramedullary cavities (3), arachnoiditis (3), disk-space-centered infection or osteomyelitis (2), nonneoplastic cord swelling (2), and CSF-borne metastasis (1). MR was equal or superior to CT myelography in depicting cases of cord enlargement, cord compression, and cord atrophy, providing better tissue characterization, no shoulder artifact, and no limitation caused by CSF block. CT myelography was superior to MR in depicting cases of spondylosis and arachnoiditis. It showed superior spatial resolution, which was most pronounced when comparing axial images and hence particularly superior in detecting the lateral extent of disk herniation. Use of surface coils and thin imaging sections is essential for accurate and complete MR evaluation of the cervical and thoracic spine.

Arachnoiditis↗
PubMed1987

MR imaging in infra-, para- and retrosellar mass lesions.

To determine its diagnostic efficacy in infra-, para- and retrosellar mass lesions magnetic resonance (MR) imaging was compared with computed tomography (CT) in 39 cases. Thirty-six lesions were imaged with a Siemens 0.5 T superconducting unit, three with a 1.5 T unit. CT scanning was performed with third generation equipment. There were 28 neoplasms including eight pituitary adenomas with infrasellar extension, four meningiomas, four extensions from regional malignancies, three chordomas, three juvenile angiofibromas, three medial temporal gliomas, and one each of neuroma, epidermoid and metastasis. Eleven non-neoplastic masses included four vascular anomalies, three cholesterol granulomas, two arachnoid cysts, one sphenoid mucocele and one mixed sclerosing bone dystrophy with mass-like thickening of basisphenoid and basiocciput. While MR and CT were equally sensitive (100%), MR was superior in further delineating and characterizing a lesion. MR showed normal or abnormal blood vessels better than CT, and revealed changes of compact bone often quite satisfactorily. Effects on the brain parenchyma or CSF and airspaces were consistently well demonstrated. Provided absence of contraindications MR should be the primary radiologic screening test in suspected mass lesions of above location.

Brain Diseases↗
PubMed1986

Suprasellar lesions: evaluation with MR imaging.

The authors retrospectively evaluated the characteristics on magnetic resonance (MR) images of 59 suprasellar lesions and compared them with computed tomography (CT) scans in 55 of the cases in which CT was performed. A diverse number of lesions were included: 17 pituitary adenomas; eight optic or hypothalamic gliomas; six craniopharyngiomas; six vascular anomalies; four lesions with extension into the suprasellar space; three metastases; two each of meningioma, hamartoma, germinoma, sarcoid granuloma, and teratoma; and one each of lymphoma, optic tract hematoma, cerebrospinal fluid-borne metastasis, pituitary hyperplasia, and sphenoid sinus mucocele. MR enabled characterization of lesions containing hemorrhage, fat, flowing blood, mucus, and cyst and allowed more specific diagnoses than CT in 6% of cases. MR was equivalent to CT in allowing lesions to be detected and in 20% of cases more accurately defined altered perisellar anatomy. Vascular abnormalities can be better evaluated with MR, and use of angiography can be avoided in some cases.

Adenoma↗