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Good evening, I am Dr Ruff, thank you for contacting us today, I thought I would answer as I am a GP Urologist and your question had been waiting.
I am sorry to hear that you experienced this. Indeed this is a large cyst.
The reason for the watch and wait approach is due to the fact that these can decrease in size rapidly, as well as return even with surgical removal.
Due to this reason, it is worth waiting for 6-12 months to see what happens before committing to surgical management of this. You are entitled to a second opinion and could request this.
I would agree that a renal cyst is unlikely to be causing much back pain and I would consider addressing this with physiotherapy to at least assess the back.
No problem at all. De-roofing may be better as more likely to prevent recurrence. Aspiration can have a better effect initially and less invasive therefore also worth consideration if surgical intervention is required.
So if this persists then this could suggest surgery is indicated with no evidence of it getting smaller. As per renal cysts, they rarely suddenly become problematic.
Not a problem at all, I wish you all the best.