Publications by authors named "Charlene Tang"

Article Synopsis
  • * However, some patients do require surgery, and there is a risk of cancer recurrence, particularly in cervical lymph nodes and the thyroid bed, which can sometimes spread to the lungs and bones.
  • * Radiologists play a crucial role in monitoring patients post-surgery with imaging modalities and must be well-versed in the imaging features of recurrent DTC, correlating findings with clinical data to ensure accurate diagnosis and treatment.
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A 75-year-old woman with papillary thyroid carcinoma who underwent 131 I radioiodine treatment was incidentally found to have an established left cerebral infarct demonstrating 131 I uptake on posttherapy whole-body scan. False-positive iodine accumulation can occur in benign processes and other malignancies, necessitating awareness among nuclear medicine physicians to avoid misdiagnosing metastatic disease. SPECT/CT can be utilized to enhance diagnostic accuracy when needed.

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Widespread adoption of mpMRI has led to a decrease in the number of patients requiring prostate biopsies. Ga-PSMA-11 PET/CT has demonstrated added benefits in identifying csPCa. Integrating the use of these imaging techniques may hold promise for predicting the presence of csPCa without invasive biopsy.

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Introduction: Despite advances in diagnosis and management, patients with advanced pheochromocytomas and paragangliomas (PPGL) face limited treatment options. This study aims to evaluate the safety and efficacy of peptide receptor radionuclide therapy (PRRT) in patients with advanced PPGL, based on a single-institution experience and provide a comprehensive review of the literature.

Methods: A retrospective analysis was conducted on patients with advanced pheochromocytoma and paraganglioma who received PRRT at a single institution from April 2012 to March 2022.

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Background: IgG4-related disease (IgG4-RD) is a heterogeneous autoimmune disorder characterised by inflammatory lesions. Diagnostic imaging, such as 2-[F]FDG PET/CT, is critical in evaluation of the disease, especially for potentially lethal cardiovascular manifestations. This retrospective study examines the usefulness of semi-quantitative parameters of 2-[F]FDG PET/CT in monitoring IgG4-RD in patients with and without cardiovascular manifestations.

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Objective: The objective of this study is to determine the optimal β value for clinical use in digital 68 Ga-prostate-specific membrane antigen (PSMA-11) PET/computed tomography (CT) imaging.

Methods: 68 Ga PSMA PET/CT of 21 patients with prostate cancer were reconstructed using block-sequential regularized expectation maximization ( β value of 400-1600) and ordered subsets expectation maximization. Nine independent blinded readers evaluated each reconstruction for overall image quality, noise level and lesion detectability.

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Recent data suggest that protective immunity from COVID-19 vaccine may wane after a period, with booster doses becoming increasingly deployed in many countries. An 84-year-old woman presents with a 6-month history of left upper-limb swelling; the only history of note was an intramuscular Pfizer-BioNTech mRNA vaccine booster in the ipsilateral deltoid just 1 week before the onset of the swelling. Upper-extremity lymphoscintigraphy after the administration of 99m Tc-nanocolloid into the interstitial space of the hands showed left upper-limb lymphatic dysfunction.

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Article Synopsis
  • - A 61-year-old woman with thyroid cancer received a 124I-PET/CT scan after taking an oral 124I capsule, but it got stuck in her esophagus instead of passing through.
  • - The study demonstrates issues with imaging artifacts caused by the lodged capsule and the value of using non-attenuation correction images in similar situations.
  • - It emphasizes the need for patients to drink enough water after taking iodine capsules to minimize radiation exposure to the esophagus.
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Immunoglobulin G4-related disease (IgG4-RD) was not recognised as a systemic condition until 2003, when extra pancreatic manifestations were identified in patients with autoimmune pancreatitis. Since then, IgG4-RD has been described to involve virtually every organ system. It is highly responsive to immunosuppressants but can have detrimental effects if left untreated.

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Cognitive impairment is common in veterans with histories of traumatic brain injury (TBI). Cholinergic deficits have been hypothesized as contributors to this impairment. We report the effects of cholinesterase inhibitor rivastigmine transdermal patch treatment in veterans with TBI and post-traumatic memory impairment.

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Context: To prepare for radioactive iodine therapy in post total thyroidectomy patients with well-differentiated thyroid cancer (WDTC), either thyroid hormone withdrawal (THW) or administration of recombinant human thyrotropin (rhTSH) can be performed.

Objective: Our objective is to compare quality of life (QoL) parameters using the SF-36v2 questionnaire (Short Form health survey) and a self-evaluated item, and the hypothyroid status using modified Billewicz scores in an Asian population undergoing either THW or rhTSH for remnant ablation or adjuvant treatment following total thyroidectomy for WDTC. We will also assess the proportion of patients achieving TSH level of >30 mU/L after 4 weeks of thyroid hormone withdrawal.

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Significance: One-year follow-up is recommended for patients with macular diseases to assess functional changes associated with disease progression and to modify low-vision (LV) treatment plans, if indicated.

Purpose: The purpose of this study was to observe 255 patients with macular diseases who received LV rehabilitation (rehabilitation with a therapist) or basic LV services (LV devices dispensed without therapy) during Veterans Affairs Low-vision Intervention Trial II after the trial ended at 4 months until 1-year follow-up.

Methods: The primary outcome measure was visual ability measured with the 48-item Veterans Affairs Low-vision Visual Functioning Questionnaire.

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The concept of theranostics, where individual patient-level biological information is used to choose the optimal therapy for that individual, has become more popular in the modern era of 'personalised' medicine. With the growth of theranostics, nuclear medicine as a specialty is uniquely poised to grow along with the ever-increasing number of concepts combining imaging and therapy. This special report summarises the status and growth of Theranostic Nuclear Medicine in Singapore.

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Importance: Examining costs and consequences of different low-vision (LV) programs provides important information about resources needed to expand treatment options efficiently.

Objective: To examine the costs and consequences of LV rehabilitation or basic LV services.

Design, Setting, And Participants: The US Department of Veterans Affairs (VA) Low Vision Intervention Trial (LOVIT) II was conducted from September 27, 2010, to July 31, 2014, at 9 VA facilities and included 323 veterans with macular diseases and a best-corrected distance visual acuity of 20/50 to 20/200.

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PTEN loss has been associated with poorer prognosis in many solid tumors. However, such investigation in lymphomas is limited. In this study, PTEN cytoplasmic and nuclear expression, PTEN gene deletion, and PTEN mutations were evaluated in two independent cohorts of diffuse large B-cell lymphoma (DLBCL).

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Importance: Randomized clinical trials are needed to compare effectiveness and cost-effectiveness of different low-vision (LV) programs.

Objective: To determine the value of adding LV rehabilitation with a therapist compared with LV services without intervention.

Design, Setting, And Participants: A randomized clinical trial was conducted from September 27, 2010, to July 31, 2014, of 323 veterans with macular diseases and best-corrected distance visual acuity (BCDVAbetter-eye) of 20/50 to 20/200.

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In this article, we develop appropriate statistical methods for determining the required sample size while comparing the efficacy of an intervention to a control with repeated binary response outcomes. Our proposed methodology incorporates the complexity of the hierarchical nature of underlying designs and provides solutions when varying attrition rates are present over time. We explore how the between-subject variability and attrition rates jointly influence the computation of sample size formula.

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Objectives: This study sought to determine the optimal coronary revascularization strategy in patients with diabetes with severe coronary disease.

Background: Although subgroup analyses from large trials, databases, and meta-analyses have found better survival for patients with diabetes with complex coronary artery disease when treated with surgery, a randomized trial comparing interventions exclusively with drug-eluting stents and surgery in patients with diabetes with high-risk coronary artery disease has not yet been reported.

Methods: In a prospective, multicenter study, 198 eligible patients with diabetes with severe coronary artery disease were randomly assigned to either coronary artery bypass grafting (CABG) (n = 97) or percutaneous coronary intervention (PCI) with drug-eluting stents (n = 101) and followed for at least 2 years.

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Objective: To evaluate the effectiveness of low-vision rehabilitation in 2 cohorts derived from the Veterans Affairs Low-Vision Intervention Trial.

Methods: In a prospective study, we observed 44 participants randomly assigned to outpatient low-vision rehabilitation who did not receive additional treatment after the trial ended at 4-month follow-up and 56 participants randomly assigned to the waiting-list control group and thereafter to standard therapy. The outcome measures included visual ability domains (reading, mobility, visual information processing, and visual motor skills) and overall visual ability estimated from difficulty ratings using the 48-item Veterans Affairs Low-Vision Visual Functioning Questionnaire.

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Objective: To examine the predictive validity of measures of neurobehavioral change derived from the Disorders of Consciousness Scale (DOCS) for predicting return to consciousness 4, 8, and 12 months after severe brain injury (BI).

Design: Prospective observational predictive validity study

Setting: Inpatient rehabilitation hospitals and postrehabilitation residence

Participants: A total of 113 persons with a mean age of 38 +/- 17.8 years who were unconscious for >28 days consecutively after severe BI; 73% (83/113) with traumatic BI and 27% (30/113) with other BI.

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Article Synopsis
  • A study investigated the necessary energy levels for electrocardioversion in patients with persistent atrial fibrillation (AF) and the effects of antiarrhythmic medications.
  • The research involved 665 patients who were given either amiodarone, sotalol, or a placebo, with 504 patients undergoing electrocardioversion if they didn't reach sinus rhythm after 28 days.
  • Results showed a 71.6% success rate in electrocardioversion, with amiodarone and sotalol significantly increasing the likelihood of success compared to placebo, while calcium channel blockers had no impact on the outcome.
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Objective: To evaluate the effectiveness of a low-vision rehabilitation program.

Methods: A multicenter randomized clinical trial was conducted from November 2004 to November 2006 with a 4-month follow-up. A total of 126 patients were included, 98% of whom were white and male.

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Purpose: The Department of Veterans Affairs (VA) Low Vision Intervention Trial (LOVIT) developed an outpatient low-vision programme for patients with macular diseases providing low-vision rehabilitation comparable to VA inpatient blind rehabilitation centres (BRCs). This programme targets veterans who do not need or chose not to participate in a comprehensive inpatient blind rehabilitation programme. We examined costs and consequences using veterans in LOVIT and comparable veterans in an inpatient BRC.

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