Scanty cytoplasm and no granules I can understand its lymphoblast but how to diff b/w types

How to approach this question ?scanty cytoplasm and no granules I can understand its lymphoblast but how to diff b/w types

Just seeing the blast to comment is terribly tugh

As given he is adolescent male and mediastinal mass is there,

Suggestive of This is Immature T cell phenotype.

Now coming to the options

A and D are of B cell neoplasm which is not in this case as Mediastinal Involvement is there and Not showing property of Mature B cell phenotype.

C won’t be the answer as this is Lymphoid progenitor Neoplasm from Image .

it were a B cell type what would have been mentioned in history ? And how to differentiate between immature n mature B cell phenotype ?

Then history might be like A children without Mediastinal involvement or any other specific information regarding B cell type in case of B-ALL

And for Mature B cell phenotype type you have to rule out symptoms of Mature B cell Neoplasm like Non Hodgkin’s B cell lymphomas

Adolescent girls

Mediastinal mass

Blast more

Diagnosis: T ALL

Only clue mediastinal mass and adolessent male… It’s not possible to comment by seeing the blast…

80 percent blast and mediastinal mass resembling immature T cell phenotype means T cell ALL

Presence of mediastinal mass : likely T cell ALL