The size of the pituitary has decreased to within normal limits. The upward convexity contacting the chiasm is no longer present. Normal appearances of the chiasm and cavernous sinuses. No lesion identified on dynamic postcontrast imaging, but on the sagittal post contrast scans, there is a 1mm slit of non-enhancement in the region of pars intermedia most likely to represent a tiny pars intermedia/Rathke's cleft cyst.
Conclusion: Previous enlargement of the pituitary is in keeping with normal physiological enlargement which has normalised postpartum.