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Pseudomyxoma peritonei (PMP) usually begins as a slow-growing tumour in the appendix, called a Low-Grade Mucinous Appendiceal Neoplasm (LAMN). Rarely, PMP starts in other parts of the bowel, ovary or bladder.
Over time, the tumour produces a jelly-like substance called mucin. This can cause the appendix to swell up like a balloon. The tumour can then break through the wall of the appendix and spread tumour cells into the lining of the tummy (the peritoneum).
The tumour cells and mucin build up in the lining of the tummy, putting pressure on the bowel and causing symptoms. It can be many years before symptoms become obvious. Unlike other cancers, PMP rarely spreads via the lymphatic system or the bloodstream. It usually remains inside the tummy, spreading along its internal surfaces.
Causes of pseudomyxoma peritonei
The cause of PMP is unknown.
Signs and symptoms of pseudomyxoma peritonei
Most people don't have any symptoms for a long time. When symptoms occur they may include any of the following:
  • slow increase in waist size
  • hernia (a swelling on the abdomen)
  • loss of appetite
  • unexplained weight gain
  • abdominal or pelvic pain
  • changes in bowel habits
  • appendicitis.
Most people with these symptoms won't have PMP, but it's important to have any symptoms checked by your doctor.
How pseudomyxoma peritonei is diagnosed
PMP can be difficult to diagnose. It may be found during investigations into abdominal symptoms, or it may be discovered during an operation for another problem.
CT (computerised tomography) scan
A CT scan takes a series of x-rays that build up a three-dimensional picture of the inside of the body. The scan is painless. It can help to find where the tumour started and check whether it has spread within the abdomen. It usually takes 10-30 minutes. CT scans use a small amount of radiation, which is very unlikely to harm you and won't harm anyone you come into contact with. You will be asked not to eat or drink for at least four hours before the scan.
You may be given a drink or injection of a dye, which allows particular areas to be seen more clearly. For a few minutes, this may make you feel hot all over. If you are allergic to iodine or have asthma you could have a more serious reaction to the injection, so it's important to let your doctor know beforehand.
Sometimes the pictures from the CT scan are enough to make the diagnosis, but sometimes biopsies or an operation are needed to be sure of the diagnosis of PMP.
The treatment of PMP depends on a number of factors. These include how far the tumour has spread and your general health. Some of the standard cancer treatments, such as radiotherapy, aren't suitable for treating PMP. This is because PMP cells aren't sensitive to radiotherapy and they are often spread over too large an area for this treatment.
You may be offered surgery| to treat this kind of cancer. There are two types of surgery:
  • Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC).
  • Debulking surgery.
Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC)
This may be an option for some people. It‘s an intensive treatment that aims to remove the tumour to try to cure PMP. It is also known as the Sugarbaker technique (named after the surgeon who first developed it). It involves removing the lining of the abdomen or organs such as the bowel, omentum (fatty tissue in the tummy) and gallbladder. In women, the womb (uterus) and ovaries may also be removed. About half (50%) of people who have a Sugarbaker operation will need a stoma (colostomy). Most of the stomas are temporary and will be reversed after about six months.
Once the surgeon has removed all or most of the tumour, a heated chemotherapy drug is put in the tummy (hyperthermic intraperitoneal chemotherapy) for 90 minutes during the operation. The combination of the chemotherapy drug and heat aims to kill any tumour cells that are left behind.
This is a major operation and may take up to 10 hours. Afterwards, you’ll be nursed in a critical care unit for several days and will stay in hospital for about 2 weeks. This operation has potentially serious complications and the surgeon will discuss these with you.
The National Institute for Health and Clinical Excellence (NICE)| is an organisation that currently advises doctors on treatments for all types of illness. It has produced guidelines about this type of surgery with intraperitoneal chemotherapy. You can read the guidelines on the NICE website.
It's very important to discuss this operation with specialist doctors, as the Sugarbaker technique is a very complicated procedure and isn't suitable for everyone. It should only be carried out at a specialist centre. There are two in the UK:
Debulking surgery
This is done when it’s not possible to have cytoreductive surgery. It aims to remove as much of the tumour as possible to reduce the symptoms of the cancer. This may involve removing the omentum (fatty tissue in the tummy) and part of the bowel. In women, the womb (uterus) and ovaries may also be removed.
Unfortunately, this surgery will not take away all the tumour cells and the PMP is likely to grow back. Further debulking operations may be needed. However, each operation becomes more difficult to do, with less benefit and more risks of complications each time.
Sometimes, a permanent stoma is needed after debulking surgery. It can help to prevent the bowel from becoming blocked (obstructed). Your specialist nurse can give you more information about looking after a stoma.
Chemotherapy| can be used to treat PMP. Some people who can’t have surgery may benefit from chemotherapy. It does not cure the cancer but can be used to slow it down. Research into other treatments for PMP is ongoing and advances are being made. Cancer specialists use clinical trials| to assess new treatments. You may be asked to take part in a clinical trial. Your doctor must discuss the treatment with you so that you have a full understanding of the trial and what it means to take part.
Watchful waiting
For some people, the risks of treatment may outweigh the potential benefits, especially as this can be a slow-growing cancer. If you're in this situation, your specialist may suggest watchful waiting. This involves being monitored closely with regular check-ups. Only if the PMP begins to cause you problems will your specialist discuss starting treatment.
Reviewing information is just one of the ways you could help when you join our Cancer Voices network|.

Content last reviewed: 1 February 2013

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