level of consciousness
... that mass lesions in the brain stem cause coma, a severe alteration in the level of consciousness, by affecting the reticular formation?
... that mass <a href="./Lesion" id="mwE2M" rel="mw:WikiLink" title="Lesion">lesions</a> in the <a class="mw-redirect" href="./Brain_stem" id="mwE2Q" rel="mw:WikiLink" title="Brain stem">brain stem</a> cause <a href="./Coma" id="mwE2U" rel="mw:WikiLink" title="Coma">coma</a>, a severe alteration in the <b id="mwE2Y"><a class="mw-redirect" href="./Level_of_consciousness" id="mwE2c" rel="mw:WikiLink" title="Level of consciousness">level of consciousness</a></b>, by affecting the <a href="./Reticular_formation" id="mwE2g" rel="mw:WikiLink" title="Reticular formation">reticular formation</a>?