Which of the following statement is true in cytochemistry of ALL: (A) PAS positive (Block positivity), (B) Myeloperoxidare positive, (C) Sudon Black B positive, (D) Non specific estesare positive
Answer is A. Solution:

In L1 and L2 sub types of ALL ( B cell - ALL) PAS positive Blocker are seen in Lymphoblasts on clear Cytoplasmic background.
In T Cell - ALL and in L3 Sub type of ALL. PAS reaction is negative.