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Inmates are not entitled to a second opinion while incarcerated.
They are however entitled to "adequate medical care" which the Department of Corrections has further defined in the following administrative code sections: http://arcweb.sos.state.or.us/pages/rules/oars_200/oar_291/291_124.html
If an inmate is not receiving adequate or appropriate medical care, they should consider speaking with a civil rights attorney, or the ACLU (one of the more active advocacy groups for inmate rights). The Oregon chapter can be found here: http://www.aclu-or.org/