“…9 The only other non-neoplastic, noninflammatory tissue masses described in the canine pericardium are pericardial cysts and cystic haematomas. [4][5][6]8 Intrapericardial cysts have been comprehensively described in humans and may be congenital (coelomic, lymphangiomatous, bronchogenic, haematic, teratomatous) 6,[13][14][15] or acquired (cystic haematoma, neoplastic cysts, cysticercosis, hydatidosis). 16,17 Depending on their origin, these cysts may be lined by endothelium, epithelium or mesothelium.…”