Different forms of widening of the main carina, without disruption of the mucosa:
a) Widening at the expense of the carinal edge.
b) Widening at the expense of the anterior triangle.
c) At the expense of the right slope.
d) At the expense of both sides.
e) Total widening of the carina.
f) Combined broadening, with deformation of the light and distortion of the longitudinal folds. All changes without disruption of the mucosa.