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Infectious Diseases

Fat Necrosis - An Overview

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Fat necrosis is the death of fat cells in the body. It causes inflammation of surrounding tissues. It mainly affects the fat cells of the breasts.

Written byDr. Sherry. S. Varghese

Medically reviewed byDr. Basuki Nath Bhagat

Published At October 9, 2023
Reviewed AtMarch 8, 2024

Introduction:

Fat necrosis results from toxin invasion in the body leading to tissue dysfunction. Necrosis leads to protein denaturation, cellular swelling, and, eventually, organular breakdown. Microscopically, it appears yellowish white to cloudy white in appearance. Most of the time, this necrotized tissue is digested by enzymatic reaction and phagocytic action. This further prevents mineral calcification in tissues.

What Causes Necrosis of Fat Tissue?

Necrosis of tissue is caused due to pancreatic injury, also known as acute pancreatitis. This is an emergency condition arising in the stomach. The pathogens are released from the pancreatic enzymes into adjacent cells and the peritoneal cavity. These released pancreatic enzymes react with triglyceride esters present inside them. As a result, these fat cells are converted into liquefied mass. The accumulated necrotized tissue, if not eliminated from the body, attracts the calcium salts causing calcification.

What Are the Different Kinds of Fat Necrosis?

Fat necrosis is of two types:

  • Pancreatic Necrosis: Any inflammation of the pancreas is known as pancreatitis. This could be both acute and chronic. The rise in pancreatic enzymes gives rise to necrosis of the pancreas. The release of lipase causes fat necrosis. Damage to the blood supply due to necrosis is known as acute hemorrhagic pancreatitis.

  • Traumatic Fat Necrosis: This is caused by trauma to the breasts. It is a rare condition with an innocuous lesion. The growth of mass tissue characterizes it.

What Causes Fat Necrosis in the Pancreas?

There are many factors triggering this condition. Among these, the most common ones are gallstones and alcoholism. The common cause of this necrosis is the phagocytic action of pancreatic substances and an imbalance in the production of pancreatic enzymes.

What Are the Metabolic Factors Seen in Fat Necrosis of the Pancreas?

  1. Alcohol - Direct consumption of alcohol does not cause necrosis but can lead to it. This is seen in patients who have been regular users of alcohol for more than five years. Alcohol can sensitize the pancreas to external and internal factors causing damage, like smoking and fat intake. The formation of calcium salts results from the enzymes' pancreatic precipitate. This forms a protein plug in the small intestine, which again forms calculi and leads to inflammation.

  • Symptoms- Vomiting, pain, anorexia (a condition when people lose their appetite as a result of emotional states like anxiety, annoyance, rage, and fear), nausea, and pancreatic diabetes.

  • Treatment- Analgesics and anti-emetics, intravenous fluid therapy, and electrolyte replacement.

  1. Hyperlipoproteinemia - The increased circulation of fat in the bloodstream. A diet containing larger amounts of saturated fat is one of the causes, like eggs, meat, butter, and milk. It could be due to familial factors also. This can lead to a condition called atherosclerosis. A condition in which blood vessels are blocked with cholesterol crystals. It can lead to other severe conditions like ulceration, thrombosis, hemorrhage, and aneurysm.

  • Symptoms- Ischemic bowel disease, gangrene, thromboembolism, myocardial infarction, and brain damage.

  • Treatment- Statin and cholesterol medicines, exercise, and a healthy diet.

  1. Hypercalcemia- It is a condition where calcium levels are elevated. It is mainly caused by dysfunction of parathyroid glands. High calcium levels can lead to depletion of kidney function (kidney stone) and other activity of the brain.

  • Symptoms- Increased thirst and increased urination, muscle and bone pain, fatigue, and stomach ache.

  • Treatment- Removal of parathyroid gland and medications.

  1. Drugs- Certain medications for diabetes, neuropsychotropics, antipsychotics, antidepressants, and anticonvulsant drugs have been associated with fat deposition in the body.

  1. Genetic- Hereditary genetic dysfunction of lipoprotein metabolism is a major risk factor for familial hypercholesterolemia.

What Are the Mechanical Factors Involved in Fat Necrosis of the Pancreas?

Gallstones-Gallstones or cholelithiasis is a condition where fat deposition leads to crystal or stone accumulation in the gallbladder.

  • Symptoms- Inflammation, liver cirrhosis, jaundice (yellowing of the skin or whites of the eyes produced by an excess of the pigment bilirubin and often caused by bile duct obstruction, liver illness, or excessive red blood cell breakdown), obesity, malabsorption, and diabetes.

  • Treatment- Surgical removal of gallstones or gallbladder.

Other factors like trauma and perioperative injury can also induce fat deposition.

What Are the Vascular Factors Responsible for Fat Necrosis?

  • Shock - It is the decrease in blood flow leading to hypotension and hypoperfusion. Reduced blood flow and inadequate perfusion of cells can lead to fat deposition and multiple organ dysfunction syndrome (MODS), along with other associated conditions. It can lead to conditions like hemorrhage, burns, dehydration, and outflow obstruction.

  • Atheroembolism - It is a condition in which fat crystals are ruptured from blood vessels to nearby small renal arteries. Administration of statin and other cholesterol drugs is the prophylactic measure.

  • Polyarteritis Nodosa (PAN)- It is an inflammation of blood vessels. This is caused due to necrosed lesions.

  • Symptoms- Fever, fatigue, loss of appetite, and weight loss.

  • Treatment- Medications like Prednisone and Cyclophosphamide.

How Can One Diagnose Fat Necrosis?

Radiography is usually able to diagnose fat necrosis, yet there are two potential problems. The appearance of fat necrosis frequently occurs much later than the injury that initially caused it. Approximately one and a half years following injury is when fat necrosis first starts to show symptoms. Fat necrosis may go unnoticed by one and their healthcare provider if a person is unable to recall the damage or if they were unaware that the tissue was being affected at the time.

This is when a thorough medical history becomes important. The doctor will inquire about any past illnesses, surgeries, injuries, and treatments one may have received in the past few years.

Another challenge lies in the fact that, when examined physically and through imaging testing, fat necrosis might mimic cancer. While a prior diagnosis of cancer is a powerful predictor of fat necrosis, it also carries the risk of cancer reoccurring. An individual and their healthcare practitioner want to be certain of which. This may occasionally necessitate removing a sample of tissue for analysis.

What Tests Are Performed to Diagnose Fat Necrosis?

To detect fat necrosis, a physician could recommend a variety of imaging studies, such as

  • X-rays.

  • Ultrasound.

  • CT scan (Computed tomography- scan).

  • MRI (magnetic resonance imaging).

  • The healthcare practitioner may do a needle biopsy if they need to verify the fat necrosis in the lab.

What Are the Infectious Factors Leading to Fat Necrosis?

Certain infectious agents like Mumps virus, Coxsackievirus, and Mycoplasma pneumoniae are causative agents for fat necrosis. In conditions like epi pericardial fat necrosis, inflammatory changes, and necrotized lesions are observed. This leads to ischemia and increased capillary pressure. Administration of non-steroidal anti-inflammatory medications can be done.

What Is Fat Necrosis of Breast?

It is a palpable fat or oil deposition seen in breasts. It is painless or sometimes tenders on palpitation. This is formed due to damage to fat cells in breasts leading to the secretion of oil from small sacs. It can also develop due to radiation, breast surgery, or trauma caused by fat cells. Women around perimenopausal age are found to be the victims of breast necrosis. Management of breast necrosis can be done using a hot compress and intake of anti-inflammatory drugs. Diagnostic tests like biopsy can be performed to rule out the condition of breast cancer.

Conclusion:

Fat necrosis is a benign condition and is curable. It rarely causes pain and is self-healed on its own. The most common fat necrosis is seen among women - necrosis of the breast. Hence, nursing or lactating mothers are advised to take care of any injury induced during nursing, such as dermatitis of a nipple and inspissation of secretion through fissures in the nipples.

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Frequently Asked Questions

Because fat necrosis can mimic breast cancer on imaging investigations and lead to diagnostic uncertainty, it might be a possible health risk. Clinical manifestations include nipple retraction, skin abnormalities, and palpable lumps, which can make diagnosis and treatment choices more challenging. Individuals who have experienced trauma or breast surgery in the past should be extra careful to disclose any new symptoms to their medical professionals.

Fat necrosis frequently resolves on its own without the need for medical intervention, particularly if the necrotic tissue is well-contained and tiny. It is necessary to closely follow and rule out any cancer by clinical examination and imaging techniques to guarantee resolution. Reassuring patients that most cases of fat necrosis recover without long-term repercussions is important.

Depending on the severity and symptoms, there are various treatment options for fat necrosis, including pain medication, monitoring, and, in rare circumstances, surgical excision. Generally speaking, surgical intervention is reserved for symptomatic instances or situations where the diagnosis is unclear. When choosing a course of therapy, patient desire and the possible influence on breast aesthetics are also crucial factors to take into account.

Although fat necrosis does not in and of itself raise the risk of cancer, its appearance on imaging examinations may indicate that malignancy has to be ruled out. To confirm the diagnosis and rule out malignancy, this assessment could also involve other imaging modalities, such as an MRI or biopsy. Physicians should ensure that patients are thoroughly evaluated to rule out cancer while also communicating to them clearly and concisely about the benign nature of fat necrosis.

After therapy, fat necrosis may return, particularly if the underlying cause—such as trauma or surgery remains unabated or if the first course of treatment was insufficient. Scheduling routine follow-up meetings with medical professionals is crucial to monitoring recurrence and quickly addressing any new symptoms. For long-term care, patient education on identifying recurrence signals and the value of continuing surveillance is essential.

Fat necrosis is a common observation after breast surgery, especially when reconstruction or tissue manipulation is involved. This highlights the significance of patient education on potential postoperative problems and encompasses both cosmetic and therapeutic surgery. During preoperative counseling, surgeons should address the potential for fat necrosis with patients to control expectations and promote well-informed decision-making.

The development of fat necrosis after surgery usually happens in the first few months to a year after the treatment, however, this is not always the case. Patients should be urged to report any troubling changes as soon as they occur and be made aware of the likelihood of delayed onset symptoms. Patients who report new breast problems after surgery should raise the possibility that they have fat necrosis.

Fat necrosis can result in changes in breast appearance, such as the appearance of a palpable lump or modifications to the texture and shape of the skin. Patients may experience anxiety or pain as a result of these changes, and more testing may be necessary to identify the underlying reason. For shared decision-making, educating patients on the possible cosmetic impacts of fat necrosis and the various therapy choices is crucial.

Fat necrosis carries a small but possible danger of infection, especially if there is an open incision or if the necrotic tissue becomes secondary infected. Proper wound care and cleanliness procedures are critical to reduce this danger and encourage healing. Patients should be informed about infection symptoms and advised to visit a doctor right away if they experience any worrisome symptoms.

Fat necrosis may be more common in some anatomical sites, such as the breasts and places with a larger concentration of adipose tissue. Healthcare professionals who have a thorough understanding of the underlying variables may predict and reduce risk in vulnerable patients. Surgeons should take these aspects into account while organizing surgical procedures to reduce the possibility of fat necrosis developing.

Pregnancy complications may arise from fat necrosis, particularly in cases where there is a history of breast trauma or alterations in breast tissue brought on by breastfeeding. Those who have had breast surgery in the past should have thorough prenatal care to watch for any potential problems. Obstetricians and breast specialists must work closely together for the best care throughout pregnancy and breastfeeding.

The exact mechanisms behind the development of fat necrosis remain unclear; however, genetic factors may play a role. More study is required to fully understand the genetic tendency to fat necrosis and its consequences for patient therapy. Patients with a family history of fat necrosis or associated breast problems may benefit from genetic counseling to determine their risk and receive tailored recommendations.

Calcifications resulting from fat necrosis may be seen on imaging investigations and may need further examination to rule out malignant calcifications. Clinical management options can be guided by radiological examination, such as ultrasonography and mammography, which can assist in describing the type of calcifications. It could need a pathological investigation by a biopsy to conclusively distinguish benign calcifications from those linked to cancer.

The timeframe for fat necrosis to resolve varies but may take several months to years, depending on the size and extent of the necrotic tissue. Patients should be counseled on the expected resolution course and encouraged to follow up with their healthcare providers for ongoing monitoring. Supportive measures such as pain management and scar management techniques may be recommended to alleviate symptoms during the resolution period.

Fat necrosis may not always be avoidable, but some steps can help lower the risk, including a cautious surgical approach and postoperative care. Patient education regarding self-breast inspection and timely reporting of any new symptoms can also help with early identification and management. It takes a multidisciplinary team effort from oncologists, radiologists, and surgeons to maximize results and reduce the negative effects of fat necrosis on patient quality of life.

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Dr. Basuki Nath Bhagat

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