Glandular tissue left behind after gynaecomastia surgery, is a revision required? (photos)

Hi, it is still too early to make any judgments. Liposuction can sometimes be very effective at removing glandular tissue as well is the tissue is relatively soft. There are also more aggressive cannulas that can tackle tougher tissue.
It is not uncommon for fullness to be present at two weeks. This can be due to tissue fluid and blood with accumulates in the space where the removed tissue was. It hardens and gives the impression that nothing has been removed.
On the other hand, you might be right and it may be residual glandular tissue. Time will tell! I would wait at least 3-4 months. If you have not seen any significant improvement then you may well require a revision to remove the excess tissue.

Hi.  From the pictures that you provided, it is difficult to determine whether the fullness that is present behind the nipple is from normal post-operative swelling or from retained glandular tissue.  At only two weeks post-op, there can still definitely be some normal post-operative swelling so I don't feel that you are seeing the final result from your procedure.  I would recommend speaking with your surgeon about your concerns to see whether he feels that the fullness that is present is from swelling which will resolve over time or if there is still glandular tissue which might require additional excision in the future.  Best of Luck!