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General
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Case reports
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Xray images
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MRI of the thorax showing tumor

Treatment
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Gross description
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Gross images
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Tumor outlined by arrowheads (RA-right atrium, RV-right ventricle, TV-tricuspid valve)

Figures 1/2: nodule of atrioventricular node
fig 3: elastic and trichrome stains

Micro description
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Micro images
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Normal anatomy (no tumor) with IAS-interatrial septum (tumors are located inferiorly), TV-tricuspid valve and VS-ventricular septum

Large cysts filled with proteinaceous debris

Multiple small cysts not visible to naked eye

Cysts with irregular shape surrounded by fibrous stroma

Cyst may have two cell lining, with inner lining composed of small cuboidal cells

Tumor nests and cysts replace muscle bundles in inferior interatrial septum


Cuboidal cells and clear, sebaceous-type cells

Squamous differentiation and calcification of luminal debris

Nests of cells resembling urothelium

H&E and AE1/AE3+

Cyst wall showing the large cyst lining of simple cuboidal epithelium

Positive stains
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Negative stains
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Electron microscopy description
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Differential diagnosis
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End of Heart tumor > Cardiac tumors - benign > Atrioventricular node tumor



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