What are causes for retroperitoneal haemorrhage?
Trauma (vascular injury); coagulopathy; tumour
What renal/perirenal neoplasms are prone to haemorrhage?
Renal cell carcinoma (most common); angiomyolipoma; adrenal neoplasms.
Working diagnosis (pre-CT): Left renal colic.
There is left-sided renal ptosis secondary to a large amount of intermediate attenuation material in the left retroperitoneum, predominantly in the left posterior pararenal space and left perinephric space. The appearances are in keeping with acute haemorrhage. There is no evidence of urinary tract calculus.