Hi
It depends on the validility of the original medical...So for instance if you did your original medical on January 1st 2010 and they called about the TB after and sent your husban for furthering .....Then all should be okay..the thing is he was sent for furthering and he has to undergo what ever necessary treatments in order to clear up what was found ..The doctor DMP will forward his treatments to CIC singapore stating the treatments are done ....
But if it should happen your medical expires at all during the process then your husband will have to redo the medical over again
The process is alot more complex than that i presume from early on they start doing selection ...have you been asked to submitt original documents

Once selction has passed then they move on to background checks ....followed by meds then ...they make a decision
With your specific Embassy they are processing applications between 5-14 months ...With the medical descrepancy it will delay your file ....but good news is as long as the original medical remains valid processing shouldnt delay much longer....But if it expired then you are looking at a delay
As far as i can see your file is in Process dont worry ..it will all work out ...what they are doing is making sure your husband is addmissable to canada and not a danger to the public health ...Kepp strong and go with the process unfortuantlly there is nothing you can do but just roll with their punches
Goood luck