Uses
Placement of a catheter into a particular part of the body may allow:

Draining urine from the urinary bladder as in urinary catheterization, using intermittent catheters or Foley catheter inserted through urethra. When the urethra is damaged, suprapubic catheterisation is used instead. The suprapubic catheter is inserted through the lower part of the abdomen directly into the urinary bladder. drainage of urine from the kidney by percutaneous (through the skin) nephrostomy
drainage of fluid collections, e.g. an abdominal abscess
pigtail catheter: used to drain air from around the lung (pneumothorax)
administration of intravenous fluids, medication or parenteral nutrition with a peripheral venous catheter or central venous catheter
angioplasty, angiography, balloon septostomy, balloon sinuplasty, cardiac electrophysiology testing, catheter ablation. Often the Seldinger technique is used. direct measurement of blood pressure in an artery or vein
direct measurement of intracranial pressure
administration of anaesthetic medication into the epidural space, the subarachnoid space, or around a major nerve bundle such as the brachial plexus
transfer of fertilized embryos, from in vitro fertilization, or sperm, during artificial insemination, into the uterus
administration of oxygen, volatile anesthetic agents, and other breathing gases into the lungs using a tracheal tube
subcutaneous administration of insulin or other medications, with the use of an infusion set and insulin pump

History
Ancient inventors
Ancient Chinese used onion stalks, the Romans, Hindus, and Greeks used tubes of wood or precious metals.The ancient Syrians created catheters from reeds. Modern
The earliest invention of the flexible catheter was during the 18th century.
It is seen protruding into the amniotic cavity near the insertion of the cord. Doppler examination shows anechoic cystic areas, with pulsatile flow in spectral analysis. Some chorioangiomas may be solid masses, and may not be identifiable in gray-scale imaging. Therefore, the investigation of choice is Colour Doppler, which also distinguishes it from placental hematoma.They can also be detected with MRI.Histologically, chorioangiomas consist of abundant vascular channels and may be cellular. Management
Expectant management is recommended for chorioangioma as majority of them are asymptomatic. Large tumors are monitored with ultrasonogram every 1–2 weeks. In case of maternal or foetal complications, possible interventions are serial foetal transfusions, fetoscopic laser coagulation of vessels supplying the tumor, endoscopic surgical devascularization and chemosclerosis using absolute alcohol. Prognosis
Large chorioangiomas with decreased echogenicity, decreased tumor volume and decreased blood flow in colour doppler images are may undergo spontaneous infarction. When chorioangiomas have deceased blood flow, fetal hemodynamics and clinical outcome are found to be improved. Epidemiology
It is the most common tumor of the placenta. Chorioangiomas over the size of 5 cm in diameter are rare, and occur at a rate of 1:3500 to 1:16,000 births. Smaller chorioangiomas are more frequent, with an incidence of 14‑139:10,000 births. However, many small chorioangiomas may not be sonologically visible and hence go unreported. In a clinical study, more than half of all tumors were discovered only by histological techniques. History
Chorioangioma was first described by Clarke in 1798. See also
Hemangioma
Chorangiosis

References
External links
Chorangioma (pathweb.uchc.edu)
Chorangioma (humpath.com)