فهرست مطالب x. qi

To assess the use of computed tomography (CT), ultrasonography and magnetic resonance imaging (MRI) in distinguishing papillary thyroid cancer (PTC) from benign thyroid nodules.

A total of 45 cases with benign thyroid nodules and 75 cases with papillary thyroid cancer were included from our hospital from March 2020 to December 2021. All patients were examined by MRI, ultrasonography and dual-energy CT. The outcomes of the two groups' MRI, CT and ultrasonography scans were compared.

The benign nodule group had significantly higher pure diffusion coefficient (D) (1.38±0.32 vs 0.95±0.12), perfusion fraction (F) values (17.13±4.35 vs 12.83±2.93) and iodine concentration (IC) plain scan scores (0.96±0.44 vs 0.56±0.37), whereas it had lower IC artery scores (2.65±1.11 vs 3.92±1.22) than those of the PTC group (p<0.001 for all). The Emax value of the PTC group was substantially greater than that of the benign nodule group (62.53±37.93 vs 25.37±8.38, p<0.001), and the percentage of nodules with aspect ratio ≥ 1 was higher in the PTC group than in the benign nodule group (48.0% vs 22.2%, p=0.005). The area under the curve (AUC) for MRI in the diagnosis of PTC patients was 0.885, which was substantially higher than those for ultrasonography (AUC=0.705) and CT exams (AUC=0.753) (p<0.001).

MRI, ultrasonography and CT examinations are essential for discriminating between benign thyroid nodules and PTC. MRI has better diagnostic accuracy than the other two tests.

The high incidence of intracranial aneurysms and the high mortality rate after rupture highlight the requirement and importance for early and accurate visualization of the aneurysm profile for subsequent patient treatment. Here we report a patient with an intracranial aneurysm who underwent digital subtraction angiography (DSA), zero echo time MRA (ZTE-MRA), and three-dimensional time-of-flight MRA (3D-TOF-MRA) on admission and after operation. The imaging quality and accuracies of ZTE-MRA and 3D-TOF-MRA were compared with DSA, the gold standard, in pre-operative and post-operative evaluation of intracranial aneurysms. Comparison of the two MRAs, ZTE-MRA has greater advantages in imaging.