Medical Oncologist
CION Cancer Clinics
Microvascular surgery, and why it takes so long | CION Cancer Clinics
Microvascular free flap surgery usually takes many hours, often most of a day. It combines removing the cancer, lifting living tissue from another part of the body, and stitching blood vessels thinner than a matchstick under a microscope. That last step cannot be rushed. A long operation is expected, and on its own it does not mean anything has gone wrong. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- Why does free flap surgery take so long?
- Where do the hours actually go?
- What can make your operation longer or shorter?
- What do families worry about during the long wait?
- What can the family do on the day?
- Who may this surgery not suit, and what can this page not tell you?
- Common questions about microvascular surgery
The short answer
Why does free flap surgery take so long?
Free flap surgery usually takes many hours, often most of a day, because it is really two or three operations done back to back. The cancer is removed, living tissue is lifted from another part of the body, and then blood vessels thinner than a matchstick are stitched together under a microscope.
What "microvascular" means
Micro means very small and vascular means blood vessels. Microvascular surgery is the skill of joining tiny arteries and veins so that blood flows through them again. It is what keeps a free flap alive once it has been cut free from its original place.
Why the join cannot be rushed
Each vessel is stitched with thread finer than a hair, one stitch at a time, while the surgeon looks through a microscope. A single stitch that catches the far wall or narrows the vessel can cause a clot. That clot can cost the whole flap. So speed is never the aim at this stage; a clean, open join is. Once the join is done, the team often waits and watches before closing, to be sure the flap turns pink and the vein drains properly.
A long operation is expected with this kind of surgery. On its own, the length does not mean something went wrong.Inside the theatre
Where do the hours actually go?
-
Getting you safely asleep
The anaesthetist puts in drips, a line to measure blood pressure closely and a urine tube. After head and neck surgery a breathing tube in the neck, a tracheostomy, is often placed as well.
-
Removing the cancer
The cancer surgeon removes the tumour with a margin, a rim of healthy tissue, and often the lymph nodes in the neck. This part alone can take several hours.
-
Finding vessels to connect to
Suitable arteries and veins near the gap are found and prepared. After earlier radiation or surgery, this can be slow, careful work.
-
Raising the flap
The tissue is lifted with its own artery and vein traced back to a useful length. If bone is included, it is shaped to fit.
-
Joining the vessels
Under the microscope the flap's artery and vein are stitched to the prepared vessels. The team then waits and watches to be sure blood is flowing in and draining out.
-
Setting the flap and closing
The flap is stitched into the gap, the donor site is closed or grafted, and drains are placed before you are moved to recovery.
Not sure whether this applies to you?
Ask an oncologistWhy times vary
What can make your operation longer or shorter?
Two people having what sounds like the same operation can spend very different times in theatre. These are the usual reasons.
Earlier radiation or surgery
Scar tissue and radiation make vessels stiff and harder to find. The surgeon may have to look further away for healthy ones, which can mean a longer flap stalk or a vein graft to bridge the distance.
The state of your vessels
Diabetes, smoking and hardened arteries can leave vessels narrow or fragile, so each join takes more care. Sometimes a join is redone on the table because blood is not flowing well enough through it.
Rebuilding bone
A jaw rebuilt with bone from the leg has to be measured, cut into pieces and fixed with plates before the vessels are joined.
Often needed for
- Lower jaw
- Upper jaw and palate
One team or two
When a second team raises the flap while the cancer is being removed, the total time can be shorter. Not every site allows this.
Ask whether two teams will work at once in your operation.Commonly believed
What do families worry about during the long wait?
"It has gone past the time they said, so something
must be wrong."
Timings given before surgery are estimates. Vessel work often runs longer than planned for reasons that are not a problem at all. Ask the team beforehand who will update the family and how.
"A faster surgeon is a more skilled surgeon."
In microvascular work, care matters more than speed. A good join takes the time it takes. Judge a team by how regularly it does this operation and how it looks after the flap afterwards.
"So many hours asleep will damage the brain."
Long operations carry real risks, such as clots in the legs, chest infections and pressure on the skin. The anaesthetist watches breathing, blood pressure and oxygen throughout. Ask them directly what the risks are for you.
"Once the flap is in, the hard part is over."
The first few days matter a great deal. A join can still block, so nurses check the flap often, day and night. Occasionally a quick return to theatre is needed.
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For the family
What can the family do on the day?
- Agree one family member as the contact for updates
- Keep that phone charged and switched on all day
- Take turns resting and eating rather than all waiting
- Ask where the patient will go after theatre
- Bring a list of all medicines the patient takes
- Expect limited visiting in the first days
Being straight with you
Who may this surgery not suit, and what can this page not tell you?
This page cannot tell you how long your own operation will take, or whether a free flap is right for you. Your surgeon and anaesthetist decide that after looking at your scans, your health and the operation needed to remove the cancer.
When a long operation may not be the safer path
Some people cannot safely stay under anaesthesia for many hours, often because of serious heart or lung disease, or frailty. Others have vessels so damaged by radiation, diabetes or smoking that a join is unlikely to hold. For them, the team may suggest a flap that stays attached nearby, a skin graft, a simpler closure or a prosthesis, a custom-made artificial part.
Questions worth asking beforehand
Ask roughly how long the operation is expected to take and why. Ask where you will recover afterwards and how often the flap will be checked. Ask what happens if the flap needs to go back to theatre at night. Ask whether the centre does microvascular surgery regularly, rather than assuming it does. And ask the anaesthetist what they will be watching for during the long hours, and what they need to know about your heart, lungs and medicines before the day.
Did you know
Surgeons often join the vein as carefully as the artery. A blocked vein lets blood in but not out, and a flap can swell and turn dark even while its artery is working well.
Questions we are asked
Common questions about microvascular surgery
How long will the operation take?
Most free flap operations take many hours, often most of a working day or longer. The time depends on the cancer surgery, the flap chosen, whether bone is rebuilt and the state of your vessels. Ask your surgeon for a rough estimate and treat it as a guide, not a deadline.
Will someone tell us how it is going?
Many teams send a message or speak to the family at key points, such as when the cancer has been removed. Ask before surgery how updates work at your centre and give one phone number. Silence for a few hours usually just means the team is busy with careful work.
Does a longer operation mean a longer recovery?
Often, yes. A long anaesthetic, a large cancer operation and a second wound at the donor site all add to recovery. Many people spend the first days in intensive care or a close monitoring area. Getting out of bed early, with help, is part of recovering well.
Is the microscope surgery done by the cancer surgeon?
It may be done by a head and neck surgeon with microvascular training, a plastic surgeon, or a combined team. What matters is that the person joining the vessels does it regularly. Ask who will do the reconstruction and whether they will see you on the ward afterwards.
Can blood thinners affect the flap?
They can affect bleeding and clotting, which both matter for a flap. Tell the team about every medicine, including aspirin and clopidogrel. Do not stop or change any of them yourself. Your surgeon, anaesthetist and prescribing doctor will decide together what to do and when.
What if the flap has a problem at night?
Nurses check the flap regularly through the night. If blood flow looks affected, the surgeon is called, and a return to theatre may happen quickly because acting early gives the join more chance of being saved. Ask how the night-time cover works where you are treated.
Can an older person have this surgery?
Age alone does not decide it. Overall fitness, heart and lung health and independence at home matter more. An older person may be assessed by the anaesthetist in detail before surgery. Ask what tests are planned and what the simpler options would be.
Does a long operation cost more?
Usually, because theatre time, intensive care and hospital stay all add to the bill. What you pay yourself depends on your cover. Aarogyasri, CGHS, ECHS, EHS and cashless insurers each have their own rules. Call the helpline to check your cover against the plan.
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Sources
- National Cancer Institute — Surgery to Treat Cancer
- Cancer Research UK — Head and neck cancer
- NHS — General anaesthesia
- Macmillan Cancer Support — Cancer information and support
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
What a Free Flap Actually IsThe operation itself in plain languageFlap Monitoring in the First 72 HoursWhat happens on the ward once theatre is overAnaesthesia for Cancer SurgeryWhat a long anaesthetic involves and what to askCaretaker and Family Guide to SurgeryHow the family can help before and after
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