Three important details required while interpreting the scan would be the interval between the scan and surgery, the pre-operative diagnosis on the baseline scan and the appearance on contrast injection.
In the immediate post op period (first few days), hemorrhage and other post operative changes can mimic a residual tumor
If the scan has been done within a week or two of surgery, then these features could represent a residual tumor (incompletely excised).
Even later, these features probably represent a recurrent tumor.
A comparison with the pre-operative scan would be vital.
It would be important to get a neurosurgeon's opinion, preferably the same doctor who has operated you earlier.
Also, a contrast enhanced MRI
scan would be very important to decide further management as this would demonstrate the extent of involvement and definitely diagnose a residual / recurrent tumor.