2026-11-02
Everything About Mushroom Neck Syndrome, Buffalo Hump, and Neck Callus (Surgical Treatment)
A guide to mushroom neck (buffalo hump), covering its causes, why it's fat rather than muscle, why ultrasound fat removal is preferred, and the importance of posture correction.
#MushroomNeck #BuffaloHump #NeckCallus #DowagerHump #BuffaloContouring
Hello, this is Dr. Cho Young-min.
Today, I'd like to talk about a slightly different treatment, something other than lifting.
Have you ever seen someone with a bump-like protrusion on the back of the neck?
As the illustration shows, the area where the neck meets the back is protruding.
This condition goes by many names, including buffalo hump, mushroom neck, dowager's hump, and neck callus.
It can develop even in healthy people with no systemic metabolic disease,
and the cause of these humps has been established as pressure from the seventh cervical vertebra (C7).
So... what exactly is this bump??
Muscle? Fat?
Anatomically, the area where buffalo hump, dowager's hump, mushroom neck, and neck callus develop corresponds to the upper portion of the trapezius muscle.
However, this area does not enlarge, even in people with highly developed muscles.
So it is not muscle.
The mass is simply fat tissue that has grown enlarged through hyperfibrosis, triggered by external stimulation (pressure from the C7 spinous process).
Mushroom Neck / Buffalo Hump / Neck Callus / Dowager's Hump: What Causes It?
I mentioned earlier that the spinous process of C7 presses on the tissue and causes the bump.
A bone that just sits there pressing on my tissue? Surely not, right? :)
When you habitually hold a hunched posture for long periods,
the spinous process of C7 ends up poking into the tissue above it.
Just as external pressure creates calluses on the skin of our hands and soles,
internal pressure causes hyperfibrosis of soft tissue.
In the end, poor daily posture is at the heart of the problem.
Mushroom Neck / Buffalo Hump / Neck Callus / Dowager's Hump: At What Age Does It Usually Appear?
As the name "dowager's hump" suggests, it is common in women aged 50 and older.
The name is said to have originated in China, where it was often seen in middle-aged women from somewhat wealthy families.
Picture a woman who has her servants do all the work while she sits in a chair fiddling with her cat.
That posture isn't so different from how modern people hold themselves while looking at their smartphones.
Every time the head tilts forward by 15 degrees,
the force needed to support it is said to multiply several times over.....
On top of that, much of our work is now done on computers,
so it seems inevitable that this condition is more common today.
Perhaps for that reason,
this condition, once common among middle-aged women,
is now increasingly appearing in people in their 20s and 30s.
Mushroom Neck / Buffalo Hump / Neck Callus / Dowager's Hump: How Is It Treated?
Since this condition is caused by posture,
posture correction comes first.
Keep the spine upright and avoid slouching.
It's about balancing the muscles around the neck and shoulders to maintain good posture.
However, once deformation has progressed significantly and mushroom neck / buffalo hump / neck callus is well advanced, it becomes difficult even to tilt the head back,
so posture correction simply can't get started.
In such cases, it makes sense to use a procedure to remove as much of the hump as possible first,
and only then begin proper posture correction :)
Posture correction has already been explained by experts on many channels, including blogs and YouTube,
so I'll skip it in this post.
Clinical photos of large humps on the back of the neck and shoulders, with an MRI scan of the neck.
The soft tissue in this area is no longer ordinary fat.
It has hardened and become deformed, so standard liposuction is not suitable for treating it.
Liposuction can also damage the skin over the hump and cause adhesions, and it may injure the trapezius muscle beneath it.
It could do even more harm to tissue that is already strained.
That's why ultrasound fat removal (also known as buffalo contouring) is the most appropriate procedure,
since it selectively removes only the deformed fat layer, including hyperfibrotic tissue.
Illustration of a thin cannula in the fat layer under the skin, showing fat cells being broken up and removed step by step.
A fluid mixed with anesthetic is infused into the fat tissue.
When an ultrasound probe is brought close,
only the fat can be selectively broken down.
Treatment is only complete once the hump has been removed first
and correct posture habits have eliminated any further pressure from the C7 vertebra.
Mushroom Neck / Buffalo Hump / Neck Callus / Dowager's Hump: What Happens If It Is Left Untreated?
Carrying this hump around is, visibly speaking, a cosmetic concern.
It looks unsightly, and clothes don't fit well over it.
But the real problem goes beyond appearance.
If a hump made of hardened, clumped soft tissue is left alone, it puts unnecessary pressure on the neck, back, and shoulders around it.
The surrounding muscles are left under stress, either overtense or overstretched.
If this persists, it can cause chronic neck, back, and shoulder pain as well as severe fatigue.
Moreover, as the hump grows, posture will keep worsening,
which can lead to cervical disc problems and added strain on the thoracic and lumbar spine,
potentially damaging the entire spine.
If the hump is very small, posture correction alone can improve it considerably.
But if the hump is large enough to limit the body's normal range of motion,
I strongly recommend having it removed as soon as possible.
Frequently Asked Questions
What Is Mushroom Neck?
Mushroom neck refers to a bump-like protrusion on the back of the neck. It is also called buffalo hump, dowager's hump, or neck callus. It can also develop in healthy people with no systemic metabolic disease.
What Causes Mushroom Neck?
It is explained as being caused by the spinous process of C7 pressing into the tissue above it due to a hunched posture. Just as external pressure creates calluses on the hands and soles, internal pressure is said to cause hyperfibrosis of soft tissue.
Is the Hump Muscle or Fat?
The hump is fat tissue, not muscle. It is described as fat that has enlarged through hyperfibrosis caused by external stimulation. Anatomically, this area corresponds to the upper trapezius. The clinic supports this by noting that the area does not enlarge even in people with highly developed muscles.
What Procedure Is Used to Treat Mushroom Neck?
Ultrasound fat removal (buffalo contouring) is presented as the most suitable procedure. It selectively breaks down only the deformed, hardened fat layer and hyperfibrotic tissue. Standard liposuction is described as unsuitable due to the risk of skin adhesions and trapezius damage.
In What Order Should Hump Removal and Posture Correction Be Done?
Posture correction is generally the first priority. However, when deformation is advanced, the clinic says the right order is to remove as much of the hump as possible first and then begin posture correction, since it becomes difficult to start if the head cannot be tilted back.
What Happens If Mushroom Neck Is Left Untreated?
It can lead to chronic neck, back, and shoulder pain and severe fatigue, and may progress to cervical disc problems and spinal damage overall. If the hump is small, posture correction alone can help considerably, but if it is large enough to limit range of motion, early removal is recommended.