The linear measurements for the normal right atrium are a short axis of 3.5 cms and a long axis of 5.5cms. Since it has the same volume as the left atrium it should be about the same size but comparison is not that easy for a few reasons, including the different orientations of the chambers as well as the fact that they often lie in different planes making comparison at a single level difficult.. The long axis of the right atrium is mostly in an A-P direction,whereas the long axis of the left atrium is mostly in a transverse direction. They also lie only a slightly different axial plane so theat theright strium (like most right sided structures
On CXR
On Lateral Examination
On the lateral examination the right atrium is not border forming and so it is not visible.
Normally, right and left atria are the same size.
Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls. The right atrium is anterior to the left atrium and posterior to the RV. It is close to the anterior border but does not quite make it.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
The Enlarged Right Atrium
enlarged, globular heart
narrow pedicle
gross enlargement of the right atrial shadow, i.e. increased convexity in the lower half of the right cardiac border
right atrial convexity is more than 50% of the cardiovascular height
right atrial margin is more than 5.5 cm from the midline
RAE on the FRONTAL x-RAY
Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
On the CXR
Shape of the Cardiomegaly
The right atrium is the most difficult chamber to assess unless it is very large in which case it will present on the frontal CXR with a very large right paravertebral border.
When it is mildly or even moderately enlarged it is difficult to identify on plain films .
As is so often the case shape changes assist greatly in evaluating size of the heart
gross enlargement of the right atrial shadow, i.e. increased convexity in the lower half of the right cardiac border
right atrial convexity is more than 50% of the cardiovascular height
right atrial margin is more than 5.5 cm from the midline
reference structures
thoracic vertebral bodies
height of a thoracic vertebral body typically ranges from approximately 25 to 30 millimeters (mm)
the transverse diameter of an adult thoracic vertebral body typically ranges from approximately 30 to 45
RIGHT ATRIAL ENLARGEMENT ON FRONTAL X-RAY
The right atrium is the most difficult chamber to assess unless it is very large in which case it will present on the frontal CXR with a very large right paravertebral border. This is a 71 year old female person with rheumatic heart disease with pulmonary hypertension and tricuspid regurgitation hence resulting in a large right atrium (RAE)
Ashley Davidoff MDRIGHT ATRIAL ENLARGEMENT ON FRONTAL X-RAY
The right atrium is the most difficult chamber to assess unless it is very large in which case it will present on the frontal CXR with a very large right paravertebral border. The frontal CXR and coronal CT through the RA is from a 71 year old female with rheumatic heart disease with pulmonary hypertension and tricuspid regurgitation resulting in a giant right atrium (RAE). The RA accounts for the large bulge of the right border of the cardiac silhouette. The black arrowhead in the loer image points to the calcified mitral valve.
Ashley Davidoff MD
MITRAL STENOSIS WITH ENLARGEMENT OF THE LEFT ATRIUM, RIGHT ATRIUM, AND RIGHT VENTRICLE 35 year old patient with severe mitral stenosis . with left atrial enlargement (LAE) characterized by elevation of the left mainstem bronchus, straightening of the left heart border, and prominence of the upper 1/3 of the posterior border of the heart. The right atrium is also enlarged characterized by a rotund right heart border. There is right ventricular enlargement characterized by filling in of the retrosternal airspace. Ashley Davidoff MD
CT AND MRI
The linear measurements for the normal right atrium are a short axis of 3.5 cms and a long axis of 5.5cms. Since it has the same volume as the left atrium it should be about the same size but comparison is not that easy for a few reasons, including the different orientations of the chambers as well as the fact that they often lie in different planes making comparison at a single level difficult.. The long axis of the right atrium is mostly in an A-P direction,whereas the long axis of the left atrium is mostly in a transverse direction. They also lie only a slightly different axial plane so theat theright strium (like most right sided structures
Normally, right and left atria are the same size.
Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
Suggested measurements on echocardiography
long axis: 3.4-5.3 cm
short axis: 2.6-4.4 cm
area: 10-18 cm2
echocardiography estimates tend to be larger than on CT or MRI
MRI
right atrial normal size (measured at end systole on four chamber view)
RIGHT ATRIUM – Normal MRI of the normal heart using a 4 chamber view of shows normal size of the right atrium in 2 dimensions. Ashley Davidoff MD 130625.8 RIGHT ATRIUM – Normal MRI of the normal heart using an axial projection shows normal size of the right atrium in 2 dimensions. Ashley Davidoff MD 130626
Small Right Atrium
LIPOMA OF THE SVC AND RA This image of a coronally acquired T1 weighted MRI image of the heart shows a high intensity mass surrounding the SVC and the entrance right atrium (RA) with narrowing of the SVC. There were no symptoms of SVC syndrome in this patient with known COPD. Note that the mass has the intensity of subcutaneous fat. An atrial lipoma is the most likely diagnosis. Courtesy Jorge Medina 38449c KEY WORDS Cardiac, heart, vein, SVC , RA, mass, fat, lipoma, tumor, neoplasm, benign, imaging, radiology, MRI LIPOMA OF THE SVC AND RA This series of axial T1 weighted MRI images of the heart show a high intensity mass surrounding the SVC (blue arrowhead) and the entrance to the right atrium (RA). There were no symptoms of SVC syndrome in this patient with known COPD. Note that the mass has the intensity of subcutaneous fat. An atrial lipoma is the most likely diagnosis. Courtesy Jorge Medina 38449c KEY WORDS Cardiac, heart, vein, SVC , RA, mass, fat, lipoma, tumor, neoplasm, benign, imaging, radiology, MRI
CXR Emphysema and
Small Heart and Compressed Right Atrium
CXR Emphysema and Small Heart 58-year-old male presents with dyspnea. The lungs are hyperinflated with flattening of the diaphragms and increase in the retrosternal space on the lateral examination. The person also has an asthenic build with a relatively straight back and narrow A-P dimension. Frontal CXR shows a small heart with structures of the heart visualized to the right of the midline caused by compression of the low-pressure right atrium. The increased in the retrosternal airspace also compresses the relatively low pressure anteriorly positioned right ventricle. The heart is also lifted off the diaphragm (band c white arrowheads) and results in juxtaphrenic lung markings and peaks below the heart (d, arrowheads) Ashley Davidoff MD TheCommonVein.net 136232c01L
CT Emphysema and Small Heart and Compressed Right Atrium
Small Heart on CXR Patient with hyperinflation resulting in compression of the right atrium Ashley Davidoff MD TheCommonVein.net 63M 001 Small Heart on CXR Patient with hyperinflation resulting in compression of the right atrium Ashley Davidoff MD TheCommonVein.net 63M 002 Small Heart on CXR Patient with hyperinflation resulting in compression of the right atrium Ashley Davidoff MD TheCommonVein.net 63M 003
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Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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[textContent] => These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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Right Atrium
Normal and Enlarged
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Normal and Enlarged
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Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Normal Right Atrium and Left Atrium
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Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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Right Atrium
Normal and Enlarged
These two images are enhanced CT images through the tricuspid valve. The first image is normal, while the second image demonstrates a TV that lies too far forward and low associated with a huge RA and a diminutive RV. This appearance is classical of a congenital condition called Ebstein’s anomaly. In this disease, the posterior leaflet is stuck down to the posterior wall of the RV and the anterior leaflet is larger than normal often giving a flapping sound to the listening ear. The anterior leaflet behaves like a flapping sail in the wind of the blood flow.
In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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In the overlays, the RA is in royal blue and the RV is in light purple overlay. The normal TV in the first image is in pink while the malformed valve in the second image is in green. Note how large the RA is and how small the RV is in Ebstein’s anomaly.
Courtesy of Ashley Davidoff M.D. 32102 32101 copyright 2009
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Normal and Enlarged
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Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls. The right atrium is anterior to the left atrium and posterior to the RV. It is close to the anterior border but does not quite make it.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Normal Right Atrium and Left Atrium
This axial image of the heart is through the mitral (right ) and tricuspid valve (left) right atrium and left atrium (right) which are normal and about the same size. The left ventricle with the papillary muscles and the right ventricle with its papillary muscle are well seen. Note the right sided structures tend to be anterior and left sided structures tend to be posterior. Note also that the right atrium and the left atrium are about the same size and shape in this view with flat walls. The right atrium is anterior to the left atrium and posterior to the RV. It is close to the anterior border but does not quite make it.
Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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Courtesy Ashley Davidoff MD copyright 2009 all rights reserved 27531d01.8s
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[firstChild] => (object value omitted)
[lastChild] => (object value omitted)
[previousSibling] => (object value omitted)
[nextSibling] => (object value omitted)
[attributes] => (object value omitted)
[ownerDocument] => (object value omitted)
[namespaceURI] =>
[prefix] =>
[localName] => td
[baseURI] =>
[textContent] =>
Normal Right Atrium and Left Atrium
)