<unk> , true to their name, have<unk>  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<unk> .
Cystic tumour of the atrioventricular nodal region
Anomalous aortic origin of a coronary artery
Anomalous left coronary artery from the pulmonary artery
Wandering atrial pacemaker
Progressive cardiac conduction defect
Isolated atrial amyloidosis
Permanent junctional reciprocating tachycardia
Eosinophilic ulcer of the oral mucosa