Transverse colon displacement is a manifestation of pancreatic cysts. Pseudocysts in the head of the pancreas can widen the duodenal flexure and displace the transverse colon upward or downward. Pancreaticcysts include true cysts, pseudocysts and cystic tumors. In addition to the exclusion of gastrointestinal cavity lesions, compression and displacement of the cyst on the surrounding organs can also be seen. If a large pseudocyst is present behind the stomach, barium can show that the stomach is pushed forward and the lesser curvature of the stomach can be compressed. So, what are the tests that need to be done for transverse colon displacement? 1.ERCP ERCP can determine the existence and location of cysts and help differentiate them from pancreatic cancer. In the case of pseudocyst, ERCP shows cyst filling; obstruction of the main pancreatic duct with tapered or truncated obstruction end; displacement of the common bile duct by compression; non-communicating cyst with pancreatic duct branch compression and limited branch non-filling. ERCP can also check for the presence of fistulae. However, ERCP can promote secondary infection or spread inflammation, so it should not be included as a routine test in cases where the diagnosis has been confirmed. 2.Selective arteriography Selective arteriography has a definite diagnostic value for pseudocysts and can show the lesion site. The cyst area appears as an avascular area, and the adjacent vessels are seen to be displaced and deformed. This test can correctly diagnose vascular invasion, determine whether there is bleeding and the source of bleeding, and determine whether there is a pseudoaneurysm present in the sac wall. Angiography is more valuable than ultrasound and CT in determining whether a pseudocyst has invaded the spleen. A small number of pseudocysts are asymptomatic and are detected only on ultrasound. In most cases, clinical symptoms are due to compression of adjacent organs and tissues by the cyst. Abdominal pain occurs in about 80% to 90%. The site of pain is mostly in the upper abdomen and the extent of pain is related to the location of the cyst, often radiating to the back. The pain is caused by the cyst pressing on the gastrointestinal tract, retroperitoneum, abdominal plexus, and inflammation of the cyst and the pancreas itself. There is nausea and vomiting in about 20% to 75%; loss of appetite in about 10% to 40%. Weight loss is seen in about 20% to 65% of cases. Fever is often low. Diarrhea and jaundice are less common. The cyst can cause pyloric obstruction if it compresses the pylorus; compression of the duodenum can cause duodenal depression and high intestinal obstruction; compression of the common bile duct can cause obstructive jaundice; compression of the inferior vena cava can cause symptoms of inferior vena cava obstruction and swelling of the lower extremities; compression of the ureter can cause hydronephrosis, etc. Mediastinal pancreatic pseudocysts may have heart, lung and esophageal compression symptoms, chest pain, back pain, dysphagia, and jugular vein anger. If the pseudocyst extends to the left groin, scrotum or recto-uterine fossa, symptoms of rectal and uterine compression may occur. During physical examination, a mass can be found in the upper abdomen or left quarter of about 50% to 90% of patients. The mass is spherical in shape, with a smooth surface and little nodularity, but may have a fluctuating sensation and little movement, and often has pressure pain.