new_n_lost
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A 55-year-old woman presents to her physician after several episodes of syncope. Physical examination is remarkable for a low-pitched "plopping" sound during mid-systole. Two-dimensional echocardiography demonstrates a ball-valve type obstruction of the mitral valve.
Which of the following would most likely be observed if the cause of the obstruction were biopsied?
A. Benign glandular tissue
B. Densely packed smooth muscle
C. Densely packed striated muscle
D. Malignant glandular tissue
E. Scattered mesenchymal cells in a myxoid background
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| GoodGirl
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E
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| acintya
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E---> "ball valve" obstruction in left atrium--->Cardiac myxoma--most common primary cardiac tumor in adults.
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| silver
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E. Scattered mesenchymal cells in a myxoid background
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| new_n_lost
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GoodGirl wrote:
E
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| new_n_lost
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The correct answer is E.
The most common primary cardiac tumor of adults is atrial myxoma, which typically occurs as a single lesion in the left atrium that may intermittently obstruct the mitral valve. Histologically, these tumors are composed of scattered mesenchymal cells in a prominent myxoid background.
Benign glandular tissue (choice A) suggests an adenoma, which is not usually found in the heart.
Densely packed smooth muscle (choice B) suggests a leiomyoma, which is not usually found in the heart.
Densely packed striated muscle (choice C) suggests rhabdomyoma, which is the most common primary cardiac tumor in children, not adults.
Malignant glandular tissue (choice D) suggests carcinoma, which can be metastatic to the heart, but does not usually cause a ball-valve obstruction.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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