Related Experiment Video
Updated: Sep 17, 2025
08:48
Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
Published on: September 25, 2020
5.8K
The double scimitar sign.
Saileela Rajan1, Arun Sundaram2, Robert Coelho3
1Department of Pediatric Cardiology, MIOT Hospitals, Chennai, India.
Cardiology in the Young
|July 3, 2025
Summary
This study highlights the rare "double sword appearance" in scimitar syndrome, a unique finding visible across multiple imaging techniques in a pediatric patient. These distinct imaging features aid in diagnosing this uncommon congenital heart defect.
Area of Science:
- Pediatric Radiology
- Cardiovascular Imaging
- Congenital Heart Disease
Background:
- Scimitar syndrome is a rare congenital anomaly characterized by anomalous venous return of the right lung to the inferior vena cava.
- Imaging diagnosis is crucial for management, but characteristic features can be subtle.
Purpose of the Study:
- To describe the unique imaging findings in a child with scimitar syndrome.
- To emphasize the diagnostic utility of the 'double sword appearance' across various imaging modalities.
Main Methods:
- Review of imaging studies including chest radiography, angiography, and computed tomography (CT) in a pediatric patient.
- Correlation of imaging findings with the diagnosis of scimitar syndrome.
Main Results:
- Demonstration of a rare and distinct 'double sword appearance' on chest radiography, angiography, and CT.
- The 'double sword appearance' represents the characteristic venous drainage pattern of scimitar syndrome.
Conclusions:
- The 'double sword appearance' is a striking and unique imaging feature of scimitar syndrome.
- Multimodality imaging is valuable for recognizing and diagnosing scimitar syndrome in children.
Related Concept Videos
01:30Sign Convention
2.6K
When analyzing a beam subjected to various loads, it is crucial to understand the internal forces and moments generated within the structure. These internal forces can be broadly classified into normal forces, shear forces, and bending moments. To determine these forces and moments, we use the method of sections and apply a specific sign convention based on their direction and the side of the section being analyzed.
The normal force acts perpendicular to the beam's cross-section and can...
The normal force acts perpendicular to the beam's cross-section and can...
2.6K
01:10Introduction to the Sign Test
1.0K
The sign test is an important tool in nonparametric statistics, offering a straightforward yet effective method for analyzing matched pairs, nominal data, or hypotheses concerning the median of a population. It transforms data points into positive or negative signs, avoiding the need for assumptions about data distribution and instead focusing on the direction of change. It is particularly valuable when data does not conform to the normal distribution requirements of many parametric tests. For...
1.0K
01:12Sign Test for Nominal Data
158
The sign test is a nonparametric method used to evaluate hypotheses about the median of a single sample or to compare the medians of two related samples. The sign test is particularly useful when dealing with nominal data, which includes distinct categories without an inherent order, such as names, labels, and preferences. Nominal data restricts statistical analysis to evaluating population proportions rather than mean or median values that require continuous data.
For example, consider a...
For example, consider a...
158
01:17Sign Test for Matched Pairs
214
The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
To conduct the sign test, we first calculate the differences in...
To conduct the sign test, we first calculate the differences in...
214
02:21Naming Enantiomers
21.4K
The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system...
21.4K
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.4K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.4K