Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 19 peer-reviewed journal articles Updated
Endocrinology

Symptoms and Getting an Accurate Diagnosis

At a Glance

Multiple Symmetric Lipomatosis (MSL) is a complex metabolic and genetic disorder that causes non-encapsulated fat to grow symmetrically around the neck, shoulders, and upper back. It is diagnosed clinically and through MRI or CT imaging to ensure fat deposits are not compressing the airway.

Understanding Multiple Symmetric Lipomatosis (MSL) requires looking beneath the surface. It is not a result of simple weight gain or a lack of willpower. Instead, it is a complex metabolic and genetic disorder that changes how your body creates and stores fat cells.

The Biological “Glitch”

In a typical body, fat cells (adipocytes) grow or shrink based on your energy needs. In MSL, this process breaks down due to a cellular malfunction.

  • Mitochondrial Dysfunction: Often called the “powerhouses” of the cell, mitochondria in MSL patients may not function correctly. This is sometimes linked to a specific mitochondrial disorder called MERRF syndrome (Myoclonic Epilepsy with Ragged Red Fibers), caused by a mutation in the MT-TK gene [1][2].
  • Genetic Markers: Mutations in the MFN2 gene (which helps mitochondria fuse together) and the LIPE gene (which provides instructions for an enzyme that breaks down fats) have been identified in some patients [3][4][5].
  • Perturbed Autophagy: This is the body’s way of “cleaning out” damaged cells. In MSL, this cleaning process is disrupted, specifically involving a protein called CAPSL, which may allow fat cells to multiply uncontrollably [6].
  • Non-Encapsulated Fat: Unlike a standard lipoma, which is contained within a fibrous sac, MSL fat is non-encapsulated. It grows freely and infiltrates surrounding muscles and nerves, making it look and feel different from “normal” fat [7][8].

Recognizing the Symptoms

MSL has a very specific “look” that often allows doctors to identify it visually.

  • The “Madelung Collar”: Fat typically accumulates symmetrically around the neck, creating a thick, collar-like appearance [9][10].
  • Pseudo-athletic Appearance: Because the fat often concentrates in the shoulders, neck, and upper arms while the legs remain thin, patients may appear more muscular or “athletic” than they actually are [11].
  • Buffalo Hump: A prominent deposit of fat on the upper back, between the shoulder blades [12].
  • Systemic Symptoms: MSL is more than skin-deep. Many patients experience peripheral neuropathy (numbness or tingling in limbs), obstructive sleep apnea, and metabolic issues like diabetes or high triglycerides [13][14][5].

How Doctors Confirm MSL

Diagnosis is primarily clinical, meaning it is based on your physical appearance and medical history [15]. However, doctors use tools to confirm the diagnosis and rule out other conditions.

  • Imaging (CT and MRI): These are the gold standards for MSL diagnosis. They allow doctors to see exactly where the fat is deposited and, more importantly, if it is pressing on your airway, esophagus, or major blood vessels [16][17].
  • Ruling Out Other Conditions (Differential Diagnosis):
    • Dercum’s Disease: Unlike MSL, the fat deposits in Dercum’s are usually very painful [18].
    • Cushing’s Syndrome: This causes a similar “buffalo hump” but is also marked by high cortisol, a rounded “moon face,” and purple stretch marks [19].
    • Simple Obesity: General obesity involves fat distributed across the whole body, whereas MSL is localized and symmetric [11].

Why an Accurate Diagnosis Matters

Getting a formal diagnosis via imaging and genetic screening is vital. It shifts the conversation from “weight loss” to “disease management.” Knowing if your MSL is linked to mitochondrial issues or LIPE mutations can help your care team monitor you for specific risks, like heart issues or severe metabolic changes, before they become emergencies [4][5].

Common questions in this guide

What is a Madelung collar in MSL?
A Madelung collar is a thick, symmetric accumulation of fat around the neck. It creates a prominent collar-like appearance and is one of the classic visual signs doctors look for when diagnosing MSL.
How is Multiple Symmetric Lipomatosis different from regular weight gain?
In simple weight gain or obesity, fat is typically distributed across the entire body. In MSL, the fat is non-encapsulated and grows in specific, localized areas—usually the neck, shoulders, and upper body—while the legs often remain unusually thin.
Why do I need a CT or MRI scan to diagnose MSL?
Imaging tests like CT and MRI scans are the gold standard for diagnosing MSL. They allow doctors to see the exact location of the non-encapsulated fat and determine if it is dangerously pressing on your airway, esophagus, or major blood vessels.
What genetic tests are used for Multiple Symmetric Lipomatosis?
Doctors may recommend testing for mitochondrial mutations, such as the MT-TK gene linked to MERRF syndrome. They may also check for mutations in the MFN2 and LIPE genes, which are associated with how your cells process and break down fats.
Does MSL cause other health problems besides fat tumors?
Yes, MSL is a systemic condition. Beyond visible fat deposits, many patients experience peripheral neuropathy (numbness or tingling in the limbs), obstructive sleep apnea, and metabolic problems like diabetes or high triglycerides.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Do my fat deposits appear to be 'non-encapsulated' on imaging, and how does that affect the surgical approach?
  2. 2.Should I be tested for mitochondrial mutations like MERRF (MT-TK) or genetic markers like MFN2 and LIPE?
  3. 3.Can we check my metabolic health, specifically for insulin resistance, liver enzymes, and triglycerides?
  4. 4.Are these masses pressing on my airway or swallowing tubes? Should we do a CT or MRI to check the 'deep' tissue infiltration?
  5. 5.Does my clinical presentation better match MSL or another condition like Dercum's disease or Cushing's syndrome?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
  1. 1

    Multiple Symmetric Lipomatosis (Madelung Disease) in a Large Canadian Family With the Mitochondrial MTTK c.8344A>G Variant.

    Perera U, Kennedy BA, Hegele RA

    Journal of investigative medicine high impact case reports 2018; (6()):2324709618802867 doi:10.1177/2324709618802867.

    PMID: 30283804
  2. 2

    Madelung lipomatosis presenting as a manifestation of myoclonic epilepsy with ragged red fibers (MERRF) syndrome.

    Gilson RC, Osswald S

    JAAD case reports 2018; (4(8)):822-823 doi:10.1016/j.jdcr.2018.05.004.

    PMID: 30238046
  3. 3

    A mouse model of human mitofusin-2-related lipodystrophy exhibits adipose-specific mitochondrial stress and reduced leptin secretion.

    Mann JP, Duan X, Patel S, et al.

    eLife 2023; (12()).

    PMID: 36722855
  4. 4

    Homozygous LIPE mutation in siblings with multiple symmetric lipomatosis, partial lipodystrophy, and myopathy.

    Zolotov S, Xing C, Mahamid R, et al.

    American journal of medical genetics. Part A 2017; (173(1)):190-194 doi:10.1002/ajmg.a.37880.

    PMID: 27862896
  5. 5

    LIPE-related lipodystrophic syndrome: clinical features and disease modeling using adipose stem cells.

    Sollier C, Capel E, Aguilhon C, et al.

    European journal of endocrinology 2021; (184(1)):155-168.

    PMID: 33112291
  6. 6

    Calcyphosine-like (CAPSL) is regulated in Multiple Symmetric Lipomatosis and is involved in Adipogenesis.

    Lindner A, Marbach F, Tschernitz S, et al.

    Scientific reports 2019; (9(1)):8444 doi:10.1038/s41598-019-44382-1.

    PMID: 31186450
  7. 7

    Multiple Symmetric Lipomatosis in a Chronic Male Alcoholic.

    Chen SL, Hu CY, Chan KC

    Ear, nose, & throat journal 2019; (98(2)):79-80 doi:10.1177/0145561318825065.

    PMID: 30885009
  8. 8

    Symmetric Lipomatosis Arising in the Tongue Presenting as Macroglossia and Articulatory Disorder.

    Kudoh M, Omura K, Satsukawa A, et al.

    Case reports in otolaryngology 2016; (2016()):2061649 doi:10.1155/2016/2061649.

    PMID: 27413566
  9. 9

    Madelung's disease.

    López-García S, Vizán-Caravaca JR, García-Cortacero E

    Medicina clinica 2019; (152(12)):517 doi:10.1016/j.medcli.2018.07.022.

    PMID: 30392697
  10. 10

    A Case Report of Madelung's Disease in Romania.

    Cucu AI, Sava A, Bobu AM, et al.

    Diagnostics (Basel, Switzerland) 2025; (15(4)) doi:10.3390/diagnostics15040459.

    PMID: 40002610
  11. 11

    Shedding Light on Multiple Symmetric Lipomatosis: An Overlooked Syndrome in the Evaluation of Obesity.

    Saraiva M, Ferreira LMD, Carvalho R

    The American journal of case reports 2023; (24()):e941751 doi:10.12659/AJCR.941751.

    PMID: 38039195
  12. 12

    Do you know this syndrome? Type 2 benign symmetric lipomatosis (Launois-Bensaude).

    Esposito AC, Munhoz T, Abbade LP, Miot HA

    Anais brasileiros de dermatologia 2016; (91(6)):840-841 doi:10.1590/abd1806-4841.20164744.

    PMID: 28099616
  13. 13

    Beyond cervical lipomas: myoclonus, gait disorder and multisystem involvement leading to mitochondrial disease.

    López-Blanco R, Rojo-Sebastián A, Torregrosa-Martínez MH, Blazquez A

    BMJ case reports 2017; (2017()) doi:10.1136/bcr-2016-218861.

    PMID: 28630220
  14. 14

    A case of Madelung's disease presenting with obstructive sleep apnea.

    Segsarnviriya C, Chirakalwasan N

    Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine 2020; (16(9)):1603-1605 doi:10.5664/jcsm.8622.

    PMID: 32515345
  15. 15

    Multiple symmetric lipomatosis.

    Hudzik B, Szkodziński J, Gąsior M, Zubelewicz-Szkodzińska B

    Polish archives of internal medicine 2017; (127(6)):450-451 doi:10.20452/pamw.4050.

    PMID: 28680030
  16. 16

    Madelung Disease.

    Chen HW, Chen HW, Chen HL, Lai CC

    The American journal of the medical sciences 2016; (352(6)):654 doi:10.1016/j.amjms.2016.06.009.

    PMID: 27916224
  17. 17

    Prevertebral fat in Madelung disease mimicking cervical spine injury: A case report.

    Hirunpat P, Panyaping T, Charoensri A, et al.

    The neuroradiology journal 2023; (36(2)):241-244 doi:10.1177/19714009221128660.

    PMID: 36134606
  18. 18

    Dercum's Disease: A Case Report of a Patient Having Both Type 1 and Type 2 Dercum's Disease.

    Moattari C, Giovane RA, DiGiovanni Kinsely S

    Case reports in dermatological medicine 2020; (2020()):6129706 doi:10.1155/2020/6129706.

    PMID: 33224536
  19. 19

    Late Night Salivary Cortisol in the diagnosis of neoplastic hypercortisolism (including cyclic Cushing's syndrome).

    Raff H

    Pituitary 2022; (25(5)):698-700 doi:10.1007/s11102-022-01214-2.

    PMID: 35334030

This page explains the symptoms and diagnostic process for Multiple Symmetric Lipomatosis (MSL) for educational purposes. It does not replace professional medical advice, diagnosis, or imaging from a qualified healthcare provider.

Get notified when new evidence is published on Multiple symmetric lipomatosis.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.