Giant cell myocarditis is a rare disease of unknown etiology, which de
velops as a myocardial isolated affection or associated to differents
diseases. Its characteristics are such as necrosis, inflammation and g
iant cell presence in the myocardium. We present the case of a woman w
ho suffered of giant cell myocarditis, thymoma, myasthenia gravis, chr
onic lymphocytic thyroiditis, giant cell myositis, granulomatous infil
tration in the lymph nodes of the hilus of the lung and hypogammaglobu
linemia; multiple association that we have not found in any published
medical paper and that suggest the autoimmune origin of this illness.
The cardiovascular symptoms and the associated diseases are revised, a
nd we discussed the diagnostic and therapeutic topics, pointing out th
e necessity to take it into account for any patient with thymoma or my
asthenia gravis developping to heart failure or arrhythmyas.