Final answer:
Renal vein thrombosis is marked by symptoms such as darkening of urine upon standing, abdominal pain, vomiting, and constipation.
Step-by-step explanation:
Renal vein thrombosis is a condition characterized by the formation of a blood clot in the renal vein, which drains blood from the kidneys. Some common symptoms of renal vein thrombosis include darkening of urine upon standing, abdominal pain, vomiting, and constipation. Additionally, renal vein thrombosis can also cause cardiovascular abnormalities.