Sonomorphologic variants of popliteal cysts.
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Bursa, Synovial↗
Biomedical subjects
S Trattnig
Publications and source records attributed to S Trattnig.
Extra-CNS metastases of glioblastoma: CT and MR studies.
The case of a 29-year-old man with glioblastoma and multiple metastases outside the CNS is presented. Cervical lymph node involvement was ascertained with CT and magnetic resonance (MR), and numerous bone metastases were detected with skeletal scintigraphy. The extent of the cervical tumor and its relationship to the carotid artery could be better assessed with MR than with CT. The patient died despite repeat operations, radiotherapy, and intraarterial systemic chemotherapy. The importance of radiological screening for detecting glioblastoma metastases in patients with long survival is discussed.
Adult↗
MRI of unfused lumbar segments after spondylodesis.
PURPOSE: Our goal was to find a causal relation between disk degeneration in nonfused lumbar segments, back pain, and the angle of scoliotic curves 21-30 years after dorsal spondylodesis. METHOD: Thirty-two patients with scoliosis had been treated by dorsal spondylodesis 21-30 years prior to this study (mean 25.2 +/- 2.4 years). With use of MRI, signs of disk degeneration in the nonfused lumbar segments (n = 131, mean 4.1 +/- 1.4) were evaluated. Back pain evaluation was performed using the Oswestry disability score. On plain X-ray films, the angle of scoliotic curves was measured (Cobb technique). Percentage and absolute number of degenerated disks were compared to the fusion level (number of unfused caudal segments), the Oswestry score, and the Cobb angle. RESULTS: Disk degeneration was present in 20 of 32 patients (62.5%) and in 37 of 131 unfused lumbar segments (28.2%). Of eight patients (24.2%), seven had moderate back pain and one severe back pain. The mean lumbar scoliotic curve was 44.4 +/- 24.9 degrees. No statistically significant correlation was found between patients with disk degeneration and fusion level, amount of back pain, or lumbar scoliotic angle (p < 0.05). CONCLUSION: A lack of correlation between disk degeneration in unfused lumbar segments and other parameters like fusion level, back pain, and scoliotic angle can be assessed in the long-term follow-up of multisegment fusion of scoliotic curves.
Adolescent↗
MRI of the sinus tarsi in acute ankle sprain injuries.
PURPOSE: Our goal was to evaluate the visibility and incidence of traumatic abnormalities of the sinus tarsi in patients with acute ankle sprain injuries and compare these findings with the extent of lateral ankle ligament injuries on MRI. METHOD: Sixty athletically active patients (aged 18-45 years) with recent inversion trauma (< or = 7 days) underwent MRI. Replacement of fat tissue in the sinus tarsi was recorded. Inter/intraobserver agreement was calculated (kappa-statistics). Injuries of the three lateral ligaments, evaluated by MRI, were graded according to partial (1 point) or complete (2 points) tears for each of three lateral ligaments (together 0-6 points) and were compared with sinus tarsi abnormalities. RESULTS: In 26 patients (43%), replacement of sinus tarsi fat tissue was depicted by MRI. Inter/intraobserver agreement for MR changes of the sinus tarsi was good to moderate (kappa = 0.675/0.584). Grade of lateral ankle ligament injury showed a statistically significant difference (p = 0.033) between the two sinus tarsi groups (normal/abnormal). CONCLUSION: Acute ankle sprain injuries, evaluated by MRI, are associated with acute abnormalities of the sinus tarsi in 43% of patients and correlate with the extent of lateral ankle ligament tears.
Acute Disease↗
MRI versus lateral stress radiography in acute lateral ankle ligament injuries.
PURPOSE: Our goal was to compare the abilities of MRI and stress radiography to detect the extent of recent lateral ankle ligament inversion injuries. METHOD: In this prospective study, 60 athletically active patients (aged 18-45 years) with recent inversion trauma (< or = 7 days) underwent stress radiography and MRI. In 15 patients, the MR findings were reviewed at surgery. Patients were divided into three groups according to severity of ligament injury on MRI (no, one, or two to three ligament tears). Based on bilateral stress radiography, patients were classified into three groups according to the differential degree of talar tilt (< or = 5, 6-14, or > or = 15 degrees) and compared with patients from the MR groups. RESULTS: Surgery showed MRI to have 74% sensitivity and 100% specificity in the evaluation of complete lateral ankle ligament tears. Agreement between MR and stress radiography groups for the severity of recent lateral ankle ligament tears was poor (kappa = 0.030). CONCLUSION: MRI should be performed in young, athletically active patients if surgical intervention is contemplated, especially at 6-14 degrees talar tilt on stress radiography, since stress radiography tends to over- and underestimate the severity of lateral ligament trauma.
Acute Disease↗
Imaging articular cartilage defects with 3D fat-suppressed echo planar imaging: comparison with conventional 3D fat-suppressed gradient echo sequence and correlation with histology.
PURPOSE: Our goal was to shorten examination time in articular cartilage imaging by use of a recently developed 3D multishot echo planar imaging (EPI) sequence with fat suppression (FS). We performed comparisons with 3D FS GE sequence using histology as the standard of reference. METHOD: Twenty patients with severe gonarthrosis who were scheduled for total knee replacement underwent MRI prior to surgery. Hyaline cartilage was imaged with a 3D FS EPI and a 3D FS GE sequence. Signal intensities of articular structures were measured, and contrast-to-noise (C/N) ratios were calculated. Each knee was subdivided into 10 cartilage surfaces. From a total of 188 (3D EPI sequence) and 198 (3D GE sequence) cartilage surfaces, 73 and 79 histologic specimens could be obtained and analyzed. MR grading of cartilage lesions on both sequences was based on a five grade classification scheme and compared with histologic grading. RESULTS: The 3D FS EPI sequence provided a high C/N ratio between cartilage and subchondral bone similar to that of the 3D FS GE sequence. The C/N ratio between cartilage and effusion was significantly lower on the 3D EPI sequence due to higher signal intensity of fluid. MR grading of cartilage abnormalities using 3D FS EPI and 3D GE sequence correlated well with histologic grading. 3D FS EPI sequence agreed within one grade in 69 of 73 (94.5%) histologically proven cartilage lesions and 3D FS GE sequence agreed within one grade in 76 of 79 (96.2%) lesions. The gradings were identical in 38 of 73 (52.1%) and in 46 of 79 (58.3%) cases, respectively. The difference between the sensitivities was statistically not significant. CONCLUSION: The 3D FS EPI sequence is comparable with the 3D FS GE sequence in the noninvasive evaluation of advanced cartilage abnormalities but reduces scan time by a factor of 4.
Aged↗
MR compatibility of Med EL cochlear implants: clinical testing at 1.0 T.
PURPOSE: Our aim was to evaluate the MR compatibility of Med EL cochlear implants by performing in vitro and in vivo tests. METHOD: All experiments were done on a 1.0 T machine. Potential movement of the cochlear electrode relative to a scale was recorded. Potential dislodgment of the magnetic receiver coil was evaluated with the coil fixed to the retroauricular skin of a volunteer. Temperature changes were measured with temperature sensors fixed to the electrode, performing standard MR sequences. In 11 patients, MRI of the brain was performed 1 day before explantation of the devices using standard MR sequences. Testing of the auditory abilities was done before and after the examination. All explanted devices were assessed for function. RESULTS: There was no detectable movement of the electrode or the receiver coil nor any temperature change. There were no adverse events for the patients. All 11 explanted cochlear implants retained their function. CONCLUSION: Med EL cochlear implants are not a firm contraindication for MRI.
Artifacts↗
Atypical appearance of elastofibroma dorsi on MRI: case reports and review of the literature.
Three patients with histologically proven elastofibroma dorsi underwent MRI, using T1-weighted, T2-weighted, STIR (short inversion time inversion recovery), and contrast-enhanced SE sequences. All lesions typically displayed low signal intensity masses interspersed with areas of high signal intensity on T1- and T2-weighted SE images. Contrary to prior reports, two patients showed marked enhancement of the mass after administration of Gd-DTPA. Although the characteristic signal intensity on conventional T1- and T2-weighted images may lead to the early diagnosis of this rare tumor, radiologists should be aware that marked contrast enhancement may be representative in elastofibroma dorsi.
Female↗
MR of cerebral Whipple disease.
A case of cerebral Whipple disease is reported. MR findings of the brain are discussed in relation to neuropathologic lesions reported previously. Repeated MR investigations may serve as a valuable tool to evaluate long-term efficacy of treatment in cerebral Whipple disease.
Atrophy↗