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| ==Cystic tumour of the atrioventricular nodal region== | | ==Cystic tumour of the atrioventricular nodal region== |
| ===General===
| | {{Main|Cystic tumour of the atrioventricular nodal region}} |
| *Super rare.<ref name=pmid11855098>{{Cite journal | last1 = Kaminishi | first1 = Y. | last2 = Watanabe | first2 = Y. | last3 = Nakata | first3 = H. | last4 = Shimokama | first4 = T. | last5 = Jikuya | first5 = T. | title = Cystic tumor of the atrioventricular nodal region. | journal = Jpn J Thorac Cardiovasc Surg | volume = 50 | issue = 1 | pages = 37-9 | month = Jan | year = 2002 | doi = | PMID = 11855098 }}</ref>
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| *Usually 1-2 mm.
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| *May cause [[Sudden_natural_death|sudden cardiac death]].<ref name=pmid10722558/>
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| ===Gross===
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| *"Bump" in the ''triangle of Koch''.
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| *Cystic spaces.
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| ===Microscopic===
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| Features:<ref name=pmid10722558>{{Cite journal | last1 = Paniagua | first1 = JR. | last2 = Sadaba | first2 = JR. | last3 = Davidson | first3 = LA. | last4 = Munsch | first4 = CM. | title = Cystic tumour of the atrioventricular nodal region: report of a case successfully treated with surgery. | journal = Heart | volume = 83 | issue = 4 | pages = E6 | month = Apr | year = 2000 | doi = | PMID = 10722558 }}</ref>
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| *Cystic spaces lined single layer of epithelial cells.
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| *+/-Focal mononuclear inflammation.
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| *+/-[[Psammoma bodies]].
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| ====Images====
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| <gallery>
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| Image:Cystic_tumour_of_the_atrioventricular_nodal_region_-_very_low_mag.jpg | CTAVNR - very low mag. (WC)
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| Image:Cystic_tumour_of_the_atrioventricular_nodal_region_-_high_mag.jpg | CTAVNR - high mag. (WC)
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| </gallery>
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| ===IHC===
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| *CEA +ve.
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| *[[EMA]] +ve.
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| =See also= | | =See also= |