however , sarcoidlike hilar and mediastinal involvement ( 3 % [ three cases ] ) and a localized mass in the lower posterior mediastinum ( 4 % [ four cases ] ) , the anterior mediastinum ( 2 % [ two cases ] ) or unilaterally in a hilum ( 2 % [ two cases ] ) were initial presentations not encountered late in the disease .
C0025066
mediastinal
C0230150
posterior