See epiphenomenon in American Heritage Dictionary 4
nounpl.ep·i·phe·nom·e·na(-nə)
A secondary phenomenon that results from and accompanies another: “Exploitation of one social class or ethnic group by another [is] an epiphenomenon of real differences in power between social groups”(Harper's).
Pathology An additional condition or symptom in the course of a disease, not necessarily connected with the disease.