Publications by authors named "Ulysses Santos Torres"

6 Publications

  • Page 1 of 1

Placental adhesion disorder: magnetic resonance imaging features and a proposal for a structured report.

Radiol Bras 2020 Sep-Oct;53(5):329-336

Departamento de Diagnóstico por Imagem da Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil.

Placental adhesion disorder encompasses the various types of abnormal placentation that occur when the chorionic villi penetrate the uterine wall. Placenta accreta has become more common, mainly because of the increasing rates of cesarean section. Although ultrasound is the first-line imaging modality for evaluation of the placenta, it plays a limited role in cases of posterior placenta accreta and inconclusive findings. In such cases, magnetic resonance imaging (MRI) is indicated, mainly because it is a more accurate means of identifying placental invasion of extrauterine structures in high-risk pregnant women. In this review article, we present the ten major and minor MRI features of placental adhesion disorder, as described in the international literature. In addition, we propose a template for structured reports of MRI examinations of the placenta. We have also devised a guided questionnaire in order to identify risk factors in patients scheduled to undergo such examinations, with the objective of facilitating the multidisciplinary treatment planning needed in order to minimize maternal morbidity and mortality.
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http://dx.doi.org/10.1590/0100-3984.2019.0037DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7545732PMC
October 2020

The many faces of primary and secondary hepatic lymphoma: imaging manifestations and diagnostic approach.

Radiol Bras 2019 Sep-Oct;52(5):325-330

Department of Diagnostic Imaging, Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil.

Hepatic lymphoma can be divided into its primary and secondary forms. To be classified as primary hepatic lymphoma, the disease should be limited to the liver and hilar lymph nodes, with no distant involvement (to the bone marrow or other sites). Primary hepatic lymphoma is quite rare, accounting for less than 1% of all cases of non-Hodgkin lymphoma, whereas secondary hepatic lymphoma affects nearly half of such cases. Familiarity with the imaging features of hepatic lymphoma is important for its early diagnosis and appropriate management. In this essay, we aim to review the roles of computed tomography and magnetic resonance imaging in identifying and monitoring hepatic lymphomas, using sample cases to describe and illustrate the wide spectrum of imaging findings in the primary and secondary forms of this disorder.
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http://dx.doi.org/10.1590/0100-3984.2018.0013DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6808615PMC
October 2019

Optimization of magnetic resonance imaging protocol for the diagnosis of transient global amnesia.

Radiol Bras 2019 May-Jun;52(3):161-165

Department of Neuroradiology, Grupo Fleury, São Paulo, SP, Brazil.

Objective: To emphasize the most appropriate magnetic resonance imaging (MRI) diffusion protocol for the detection of lesions that cause transient global amnesia, in order to perform an accurate examination, as well as to determine the ideal time point after the onset of symptoms to perform the examination.

Materials And Methods: We evaluated five patients with a diagnosis of transient global amnesia treated between 2012 and 2015. We analyzed demographic characteristics, clinical data, symptom onset, diffusion techniques, and radiological findings. Examination techniques included a standard diffusion sequence (b value = 1000 s/mm; slice thickness = 5 mm) and a optimized diffusion sequence (b value = 2000 s/mm; slice thickness = 3 mm).

Results: Brain MRI was performed at 24 h or 36 h after symptom onset, except in one patient, in whom it was performed at 12 h after (at which point no changes were seen) and repeated at 36 h after symptom onset (at which point it showed alterations in the right hippocampus). The standard and optimized diffusion sequences were both able to demonstrate focal changes in the hippocampi in all of the patients but one, in whom the changes were demonstrated only in the optimized sequence.

Conclusion: MRI can confirm a clinical hypothesis of transient global amnesia. Knowledge of the optimal diffusion parameters and the ideal timing of diffusion-weighted imaging (> 24 h after symptom onset) are essential to improving diagnostic efficiency.
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http://dx.doi.org/10.1590/0100-3984.2018.0028DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6561356PMC
June 2019

Nail-patella syndrome.

J Clin Rheumatol 2011 Oct;17(7):402

Department of Rheumatology, State Medical School of São José do Rio Preto, São Paulo, Brazil.

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http://dx.doi.org/10.1097/RHU.0b013e31823272edDOI Listing
October 2011

MRI findings in an infant with vaccine-associated paralytic poliomyelitis.

Pediatr Radiol 2010 Dec 4;40 Suppl 1:S138-40. Epub 2010 May 4.

Department of Radiology, Hospital de Base, São José do Rio Preto Medical School, São Paulo, State, 15090-000, Brazil.

Although acute flaccid paralysis is a manifestation observed in several neurologic and muscular disorders, vaccine-associated paralytic poliomyelitis (VAPP) is an exceedingly rare etiology. In the clinical setting of acute flaccid paralysis, MRI is useful in differentiating between VAPP and other conditions. Additionally, MRI can assess the extent of lesions. However, reports on MRI findings in VAPP are scarce in the pediatric radiology literature. We report a Brazilian infant who developed VAPP 40 days after receiving the first dose of oral polio vaccine (OPV). MR images of the cervical and thoracic spinal cord showed lesions involving the anterior horn cell, with increased signal intensity on T2-weighted sequences. We would like to emphasize the importance of considering VAPP as a differential diagnosis in patients with acute flaccid paralysis and an MRI showing involvement of medulla oblongata or spinal cord, particularly in countries where OPV is extensively administered.
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http://dx.doi.org/10.1007/s00247-010-1650-6DOI Listing
December 2010
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