Please tell me, could a sinus cavity collapse?

Perhaps: 'collapse' of a sinus cavity may happen from bony trauma (e.g. Frontal bone trauma or maxillary cheek trauma). 'collapse' can also mean bony contraction of a sinus cavity over time for different reasons (bony inflammation from previous infection or surgery; silent sinus syndrome, bony tumor). If there are questions, you can see an ENT for evaluation.