Demetrios J Agriantonis

University of Wisconsin, Madison, Madison, MS, United States

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Publications (5)17.12 Total impact

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    ABSTRACT: Spontaneous perirenal hemorrhage (SPH), also known as W├╝nderlich's syndrome, is a rare urological emergency. This article reviews the most common causes of SPH and the role of imaging in establishing the correct diagnosis and in guiding the appropriate therapy. A thorough understanding of underlying etiologies, imaging appearances, optimal imaging techniques, and follow-up protocols are crucial to recognize patients with SPH due to benign disease and avoid unnecessary nephrectomies.
    Emergency Radiology 02/2011; 18(4):329-34.
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    ABSTRACT: To compare colonic cleansing and fluid retention of double-dose magnesium citrate with those of single-dose sodium phosphate in patients undergoing computed tomographic (CT) colonography. This retrospective HIPAA-compliant clinical study had institutional review board approval; informed consent was waived. The study included 118 consecutive patients given single-dose sodium phosphate for bowel catharsis and 115 consecutive patients at risk for phosphate nephropathy, who were instead given double-dose magnesium citrate. The bowel preparation regimen was otherwise identical. Four-point scales were used to assess residual stool and fluid in the six colonic segments, and attenuation of residual fluid was measured. An a priori power analysis was performed, and unpaired t tests with Welch correction were used to compare the two groups on stool and fluid scores and fluid attenuation. Both cathartic regimens offered excellent colon cleansing, with no significant difference for residual stool in any of the six segments. Stool scores of 1 or 2 (ie, no residual stool or residual stool <5 mm) were recorded in 88.6% (627 of 708) of colonic segments in the sodium phosphate group and in 88.1% (608 of 690) in the magnesium citrate group. No clinically important differences were seen in residual fluid scores in any of the six segments, with the only significant difference seen in the sigmoid colon (2.17 for sodium phosphate vs 2.44 for magnesium citrate; P< 0.01). Fluid attenuation was significantly different between magnesium citrate and sodium phosphate groups (790 HU +/- 216 vs 978 HU +/- 160; P <.001). Both sodium phosphate and magnesium citrate provided excellent colon cleansing for CT colonography. Residual stool and fluid were similar in both groups, and fluid attenuation values were closer to optimal in the magnesium citrate group. Since bowel preparation provided by both cathartics was comparable, magnesium citrate should be considered for CT colonography, particularly in patients at risk for phosphate nephropathy.
    Radiology 01/2010; 254(1):138-44. · 6.34 Impact Factor
  • Demetrios J Agriantonis, Lance Hall, Michael A Wilson
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    ABSTRACT: One of the major limitations of planar I-131 imaging is its lack of anatomic precision. SPECT/CT offers the benefit of precise anatomic localization that planar imaging lacks. Whether for confirmation of physiologic uptake or true pathology, SPECT/CT has an important role to play in clarifying equivocal findings. We present a case of papillary thyroid cancer metastatic to the liver, a relatively rare scenario. SPECT/CT allowed definitive lesion characterization at the time of the patient's visit to the nuclear medicine department.
    Clinical nuclear medicine 05/2009; 34(4):247-8. · 3.92 Impact Factor
  • Demetrios J Agriantonis, Scott B Perlman, Walter L Longo
    Clinical nuclear medicine 11/2008; 33(10):688-9. · 3.92 Impact Factor
  • Demetrios J Agriantonis, Lance Hall, Michael A Wilson
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    ABSTRACT: Whole body iodine scans are routinely performed in the nuclear medicine department as part of the management of differentiated thyroid carcinoma. Similarly, radioactive iodine has a well-established role as an adjunct to thyroidectomy in the treatment of these patients. A thorough understanding of the normal, benign, and pathologic biodistribution of iodine is imperative for the nuclear medicine physician. This knowledge leads to the accurate determination of the presence of metastatic or recurrent carcinoma, and may even facilitate the accurate detection of an undiagnosed condition. Above all, correct image interpretation avoids unnecessary therapeutic doses. The authors describe 2 unusual examples of false positive findings in fluid-filled cavities that showcase the variety of nonmalignant entities one may encounter when interpreting metastatic surveys.
    Clinical Nuclear Medicine 06/2008; 33(5):325-7. · 2.96 Impact Factor