Definition: Cysts of one of the parts of the mediastinum: the superior part, containing the trachea, esophagus, thoracic duct and thymus organs; the inferior middle part, containing the pericardium; the inferior anterior part containing some lymph nodes; and the inferior posterior part, containing the thoracic duct and esophagus.
non-neoplastic; simple mediastinal cysts commonly adjacent to pericardium; note X refs: do not coord pericardial, thoracic, thymic or tracheal cysts with respective organs or organ/dis precoord: index only under MEDIASTINAL CYST
