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==Aetiology==

==Aetiology==

In humans, RCM is usually secondary to systemic infiltrative pathologies (e.g. amyloidosis, sarcoidosis) or radiation exposure; with pathology localized at the myocardial or endomyocardial level. Cats may also have myocardial and endomyocardial forms of RCM, but this seems to occur as a primary cardiomyopathy in cats. However, endomyocardial fibrosis has been associated with viral, hypereosinophilic and immune-mediated pathologies in rare cases.

In humans, RCM is usually secondary to systemic infiltrative pathologies (e.g. amyloidosis, sarcoidosis) or radiation exposure; with pathology localized at the myocardial or endomyocardial level. Cats may also have myocardial and endomyocardial forms of RCM, but this seems to occur as a primary cardiomyopathy in cats. However, endomyocardial fibrosis has been associated with viral, hypereosinophilic and immune-mediated pathologies in rare cases.