Submucosal Tumours of the Stomach and Oesophagus (GIST, NET, Leiomyoma, and Schwannoma)

Does every submucosal tumour need treatment?

Not necessarily. Many small, low-risk tumours — particularly leiomyomas, schwannomas, and small GISTs or NETs without any concerning features — can simply be monitored with periodic endoscopy or scans, rather than removed. Surgery tends to be recommended when a tumour is growing, causing symptoms, has features suggesting higher risk, or when a firm diagnosis can't be reached without removing it.

What are the benefits of surgery?

• Removes the tumour completely — eliminating any risk of future growth or change in behaviour.

• Provides a definitive diagnosis — examining the whole tumour under the microscope gives certainty about exactly what it is, which isn't always possible from a needle biopsy alone.

• Can be curative — for tumours confined to the wall of the stomach or oesophagus, surgical removal is often all that's needed.

What are the alternatives to surgery?

• Surveillance — regular endoscopy, EUS, or CT scans to monitor the tumour over time, reserving surgery for if it changes.

• Targeted drug therapy — for some GISTs, particularly larger or higher-risk ones, medication (such as imatinib, brand name Glivec) can shrink the tumour before surgery or control it instead of surgery, depending on the situation.

• No treatment — reasonable for some small, incidental, low-risk findings, particularly leiomyomas and schwannomas.

I will discuss which of these options suits your particular tumour and situation.

What does the surgery involve?

The type of operation depends on the size, location, and type of tumour:

• Local excision (wedge resection) — removing the tumour along with a margin of normal surrounding tissue, most often performed laparoscopically (keyhole surgery) for stomach tumours. This is the most common approach for GISTs, leiomyomas, and schwannomas.

• Endoscopic removal — in select cases of small, superficial tumours, removal can sometimes be achieved during endoscopy without the need for an abdominal operation.

• More extensive resection — occasionally, if a tumour is large or in a difficult location, a bigger operation (such as a partial gastrectomy or oesophagectomy) may be needed instead.

Unlike typical stomach or oesophageal cancers, removal of surrounding lymph nodes usually isn't necessary for GISTs, leiomyomas, or schwannomas, as they don't tend to spread that way. NETs are assessed individually, as this can vary.

What are the risks of surgery?

As with any operation, there are risks. I will discuss these with you in more detail, but in general terms:

• Common, usually minor — wound discomfort and temporary adjustment to eating while your digestive system settles.

• Less common — chest infection, wound infection, or a small collection of fluid near the surgical site.

• Uncommon — leakage from the staple line or join, or bleeding.

• Rare — injury to nearby structures, or other more serious complications requiring further treatment.

Most people recover from this surgery without a serious complication, and the risks are generally lower than for the more extensive cancer operations, given that these tumours are usually removed with a smaller, more localised procedure.

What does recovery look like?

• Hospital stay — typically a few days for a local excision, though this can be longer if a more extensive operation is required.

• Eating and drinking — most people can start on fluids soon after surgery and build back up to a normal diet over a short period.

• Return to normal activity — recovery from a local excision is usually quicker than from a major cancer resection, though this varies with the extent of surgery performed.

• Follow-up — some tumours, particularly GISTs and NETs, require ongoing surveillance with scans after removal, even once successfully treated, to ensure continued wellbeing. This will be tailored to your specific diagnosis.