When the Doctor says: Several medical term definitions.

Cerebral aneurysm - A localized widening of a vessel within the brain. 

Pachyderma - Abnormally thick skin.

Pericardium - The fibroserous membrane, consisting of mesothelium and submesothelial connective tissue, covering the heart and beginning of the great vessels. It is a closed sac having two layers: the visceral layer (epicardium), immediately surrounding and applied to all the heart's surfaces, and the outer parietal layer, forming the sac, composed of strong fibrous tissue (fibrous pericardium [TA]) lined with a serous membrane (serous pericardium [TA]). The phrenic nerves pass to the diaphragm through the anterior pericardium and divide the pericardium into antephrenic and retrophrenic portions; the pulmonary hilum divides both of these portions into suprahilar, hilar, and infrahilar portions.

 Tachycardia - Rapid beating of the heart, conventionally applied to rates over 90 beats per minute.