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 Clarín newspaper, probably Argentina's most important one, only talks about a "cancer": 
 "Tomás Eloy Martínez: entre la crónica y la invención de la historia"]. 
 It took me a while to find an original source of the brain tumor in Spanish: 
 "Dolor por la muerte de Tomás Eloy Martínez". I don't know why. 
 I'm fixing the reference and removing the lungs (I mean, the word). Thanks for the note! 

  
 Good wiking, /