A 30-Year-Old Man Is Brought to the Emergency Department Due

A 30-year-old man is brought to the emergency department due to left-sided weakness.  His left arm was sluggish after awakening, and he had difficulty walking to the bathroom.  The patient has no known medical conditions but has a 2-month history of positional dyspnea.  Vital signs are within normal limits.  On examination, strength of the left upper and left lower extremity is reduced, and touch/temperature sensation is similarly diminished.  Cardiovascular examination reveals an intermittent murmur at the apex without carotid bruits.  Echocardiography shows a mobile, 3-cm left atrial mass obstructing the mitral opening during diastole.  Histologic examination of this mass would most likely show which of the following findings?

A) Amorphous extracellular matrix
B) Malignant epithelial cells with necrotic debris
C) Malignant vascular spindle cells
D) Organized thrombus
E) Well-organized, mature adipocytes

Correct Answer:

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