For some cases it takes time. You know right, its cic and each and every officer work in different fashion and no timeline (oh sorry there is but the revisit of timeline is 12 months for every step and task
). So its defitely possible that it will take anywhere from few days to few months ???
http://www.canadavisa.com/canada-immigration-discussion-board/how-long-does-it-take-after-medical-results-have-been-received-t191930.45.html
Its not only in this thread but seen many posts in different threads on pnp and fsw (for some of them it took time which we dont know the reason for though).
i still think that the visa officer is pushing the line update exclusively. on the second thought nowadays we could see that its getting updated within 10-15 days hence thinking nowadays they changed it automatically whenever the medical team verified it. Dont know much but thinking it might be.