ABSTRACT
Internal carotid artery (ICA) stenosis including Moyamoya disease needs revascularization when hemodynamic insufficiency is validated. Vascular reserve impairment was the key to find the indication for endarterectomy/bypass surgery in the atherosclerotic ICA stenosis and to determine the indication, treatment effect, and prognosis in Moyamoya diseases. Vascular reserve was quantitatively assessed by 1-day split-dose I-123 IMP basal/acetazolamide SPECT in Japan or by Tc-99m HMPAO SPECT in other countries using qualitative or semi-quantitative method. We summarized the development of 1-day basal/ acetazolamide brain perfusion SPECT for ICA stenosis, both quantitative and qualitative methods, and their methodological issues regarding (1) acquisition protocol; (2) qualitative assessment, either visual or deep learning-based; (3) clinical use for atherosclerotic ICA steno-occlusive diseases and mostly Moyamoya diseases; and (4) their impact on the choice of treatment options. Trials to use CT perfusion or perfusion MRI using contrast materials or arterial spin labeling were briefly discussed in their endeavor to use basal studies alone to replace acetazolamide-challenge SPECT. Theoretical and practical issues imply that basal perfusion evaluation, no matter how much sophisticated, will not disclose vascular reserve. Acetazolamide rarely causes serious adverse reactions but included fatality, and now, we need to monitor patients closely in acetazolamide-challenge studies.
ABSTRACT
@#Background: Lung cancer is one of the leading causes of cancer-related mortality worldwide. Pulmonary nodules are commonly encountered in clinical practice because of the recent implementation of low-dose CT lung screening programme, incidental finding on cardiac CT or CT for nonthoracic related disease. 18 F-FDG PET-CT plays an important role in the management of pulmonary nodules. Methods: In this pictorial review, we present six different scenarios of using 18 F-FDG PET-CT in the management of suspicious pulmonary nodule or mass. The advantages and limitations of 18 F-FDG PET-CT and Herder model are discussed. Results: 18 F-FDG PET-CT with risk assessment using Herder model provides added value in characterising indeterminate pulmonary nodules. Besides, 18 F-FDG PET-CT is valuable to guide the site of biopsy and provide accurate staging of lung cancer. Conclusion: To further improve its diagnostic accuracy, careful history taking, and CT morphological evaluation should be taken into consideration when interpreting 18FFDG PET-CT findings in patients with these nodules.
ABSTRACT
carcinoma has been reclassified as non-invasive follicularthyroid neoplasm with papillary-like nuclear features (NIFTP)to emphasize the benign nature of this entity. In ourinstitution, we have assessed 455 patients treated withradioiodine ablation for differentiated thyroid carcinoma and20 of them were retrospectively found to fulfill the newNIFTP criteria. There was no evidence of metastasis on postradioiodine whole body scans for NIFTP cases and thesepatients were in remission subsequently. The benignfeatures of these patients’ whole body scans and goodclinical outcome following treatment further support NIFTPas a low risk thyroid neoplasm.
ABSTRACT
This is a case of follicular thyroid carcinoma with extensive lung, bone and brain metastases. Multi-modality treatments including total thyroidectomy, modified radical neck dissection, cranial radiotherapy and Iodine-131 (RAI) therapy were instituted. Post RAI therapy planar whole body scan showed RAI avid metastases in the skull, cervical spine, bilateral lungs and abdomen. With the use of SPECTCT imaging, rare adrenal metastasis and additional rib metastasis were identified. Besides, management strategy was altered due to detection of non-RAI avid brain and lung metastatic lesions.