Cystic tumour of the atrioventricular nodal region

Cystic tumour of the atrioventricular nodal region is a very rare tumour of the heart in the region of the atrioventricular node. It is also known as "mesothelioma of the atrioventricular node".
Presentation.
It may present as a cardiac arrhythmia or as sudden cardiac death.
Pathology.
Cystic tumours of the atrioventricular nodal region, true to their name, have cystic spaces, which are lined by a single layer of histomorphologically benign epithelial cells. The appearance is similar to that of lymphangioma and this is a name that has been used for this tumour.
Treatment.
The treatment of cystic tumours of the atrioventricular nodal region is surgical excision.