Partially collapsed lung

Anyone experience a partially collapsed lung? I am 47, never smoker and diagnosed with Stage IIIa NSCLC December of 2019. I had a lobectomy last April and was surprised to find out two weeks ago at my 3 month scan my lung had partially collapsed a year after surgery. I knew something wasn’t quite right before scans but was not expecting that news. Had an X-Ray last week and no improvement yet. Was told it can take a long time to heal.