Diffuse hepatic vascular malformations with right aortic arch.
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Biomedical subjects
Makoto Amanuma
Publications and source records attributed to Makoto Amanuma.
Chronic expanding hematoma in the retroperitoneal space: a case report.
A case of retroperitoneal chronic expanding hematoma complicated with hydronephrosis, which was difficult to diagnose preoperatively, is reported. The patient was a 70-year-old man. An 18 cm mass was detected in the right retroperitoneal space on abdominal CT screening. There were small calcifications in the periphery of the mass that were strongly enhanced in the delayed phase of dynamic CT. The mass involved the right ureter and iliopsoas muscle, resulting in severe hydronephrosis. The histological diagnosis was chronic expanding hematoma.
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[Contrast-enhanced MR venography of the head using magnetization prepared rapid gradient echo imaging: comparison between head and body radiofrequency transmitter coil systems].
PURPOSE: To evaluate the image quality and vascular selectivity of MR venography of the head using an MP-RAGE technique when obtained with a body radiofrequency transmitter coil system. MATERIALS AND METHODS: A total of 24 patients were imaged with a head or body RF transmission system. Subtraction MRA was processed with 0.1 mmol Gd-DTPA administration, and signal-to-noise ratios of the vascular system were measured. Venous demonstration and selectivity were also assessed. RESULTS: MP-RAGE MR venography with a body transmission system showed almost the same signal intensity for the venous and arterial systems, resulting in nonspecific vascular demonstration, while the head transmission system showed semi-selective venograms owing to inflow-induced high signal on precontrast images. However, MRA with a body transmission system provided a 1.5- to 2.5-fold higher signal-to-noise ratios based on higher gradient performance and excellent demonstration of the head veins, especially those below the skull base. CONCLUSION: Although selective venography was difficult, MRA with a body transmission coil provided excellent vascular images of the brain.
Cerebral Veins↗
[Dual-phase chemical-shift imaging in the detection of diffuse bone metastasis].
Preliminary studies were performed to evaluate the usefulness of lumbar bone marrow MRI using the dual chemical-shift GRE sequence in the detection of diffuse bone metastasis. Two GRE images (TE = 2.3 msec and 4.6 msec) were obtained, and SIR was calculated. SIR was designated as the ratio of in-phase to out-of-phase signal intensity. Among 45 patients with suspicious lumbar bone metastases, diffuse bone metastases were present in 7. Mean SIRs were compared by unpaired t-test. SIRs of diffuse bone metastases had significantly higher signal intensities than those of non-diffuse bone metastases of vertebrae (p < 0.01).
Adult↗
[Feasibility of CT attenuation values in the diagnosis of anemia].
PURPOSE: To verify the possible correlation between CT attenuation value and hemoglobin (Hb). MATERIALS AND METHODS: CT attenuation was evaluated in 113 CT studies. Anemia was defined as an Hb level less than 14 g/dl in males and less than 12 g/dl in females. Hb was compared visually by grading (Grade 1: cardiac muscle density much higher than lumen, Grade 2: cardiac muscle density higher than lumen, Grade 3: cardiac muscle density equal to lumen), and with HU of CT attenuation on unpaired t-test (p<0.01). Correlations were calculated using the linear regression method. RESULTS: Hb of less than 6 g/dl was found to be Grade 1, while that over 12 g/dl was considered Grade 3 on visual grading. The attenuation numbers of subjects with anemia yielded low values, whereas those of normal subjects were higher. There were significant differences between subjects with anemia and normal subjects (p<0.01). HU versus hemoglobin showed a linear increase, with a correlation coefficient of 0.76. CONCLUSIONS: This simple, readily available information may provide a valuable adjunct in the interpretation of CT examinations.
Adolescent↗
A case of testicular malignant lymphoma with extension to the epididymis and spermatic cord.
Findings of magnetic resonance imaging (MRI) in a case of testicular lymphoma are presented. The tumor was lower intensity than the normal testis on T2-weighted images. Coronal images clearly showed the tumor extending to the spermatic cord. Compared with seminoma, lymphoma more often invades the epididymis and spermatic cord. MRI is a useful method for differentiating between testicular lymphoma and seminoma because it clearly shows tumor extension to the epididymis and spermatic cord.
Contrast Media↗
Air embolism detected during computed tomography fluoroscopically guided transthoracic needle biopsy.
Air embolism is a rare but potentially fatal complication of percutaneous needle biopsy of the lung. We report a case of cerebral air embolism which occurred during computed tomography (CT)-guided needle biopsy. Air entering the aorta is depicted on CT-fluoroscopy images of the procedure.
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