Talk to Pulmonologist / Lung on Something Under Left Lungs

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Question:

Dear Doctor, I would like your expert opinion regarding my mother's recent CT scan report. The OPINION section of the report mentions the following findings:

> "Invariably thin, soft tissue attenuation walled fluid to soft tissue attenuation lesion in left lower lobe with faint ground glass in perilesional parenchyma" "Features are likely suggestive of inflammatory lesion (simple / hydatid / bronchogenic cyst) with possible differential loculated effusion" "Clinicopathological correlation is also suggested in this context"

I would appreciate it if you could kindly clarify the following:

1. What exactly does this finding mean in simple terms?

2. What is a bronchogenic cyst or hydatid cyst, and how serious are these conditions?

3. What does loculated effusion mean, and what are its possible effect