Fat Necrosis
Chalky white deposits, indicative of fat necrosis and calcium saponification (where calcium ions bind to free fatty acids), are often visible.
Fat Necrosis
- Death of fat cells in the breast, usually following trauma or surgery. Dead fat cells trigger an inflammatory reaction that heals by scarring — and that scar can look and feel exactly like cancer.
- About half of patients have a history of breast trauma or prior surgery
- The other half have no obvious cause
- What happens — step by step:
- Fat cells are injured → central liquefactive necrosis forms
Read this in Breast Inflammation: Mastitis, Periductal Mastitis & Duct Ectasia
Fat Necrosis
- Follows trauma or surgery to the breast. It presents as a firm, sometimes calcified mass that can mimic carcinoma . Histologically, it shows necrotic fat cells surrounded by inflammatory cells and fibrosis. It is benign .
Read this in Disorders of the Vagina and Breast
What our notes say
- Chalky white deposits, indicative of fat necrosis and calcium saponification (where calcium ions bind to free fatty acids), are often visible. (Pancreatic Disorders: A Comprehensive Review)
- Extravasation of the milk may produce chronic inflammation and even fat necrosis. (Breast mcqs — Past Paper Questions & Answers)
- Once the pancreatitis has started, the formation of the chalky soap deposits of fat necrosis may draw off calcium to produce hypocalcemia. (Gastrointestinal and liver — Past Paper Questions & Answers)
- | Fat Necrosis | History of trauma/surgery (~50%); mimics cancer; liquefactive necrosis → giant cells/calcification → scarring | (Exam Prep: Skin Infections, Psoriasis & Pemphigus)
- | Inflammatory | Mastitis, Zuska disease, Duct ectasia, Fat necrosis | Zuska = smokers; fat necrosis mimics cancer | (Exam Prep: Skin Infections, Psoriasis & Pemphigus)
- Fat necrosis mimics cancer perfectly — painless mass, skin retraction, calcifications on mammogram (Breast Inflammation: Mastitis, Periductal Mastitis & Duct Ectasia)
Study material on Fat Necrosis
- Breast mcqs
- General Pathology MCQs: Fixatives, FNA, Endocrine & ARDS
- Pancreatic Disorders: A Comprehensive Review
- Skin & Breast Pathology CAT: MKU Year 3 Medicine Exam
- Exam Prep: Skin Infections, Psoriasis & Pemphigus
- Breast Inflammation: Mastitis, Periductal Mastitis & Duct Ectasia
- Disorders of the Vagina and Breast
Practice questions on Fat Necrosis
A patient develops acute pancreatitis. Areas of fat necrosis in the peritoneum appear as chalky-white deposits. This appearance is due to:
- Deposition of fibrin from vascular injury
- Accumulation of cholesterol crystals
- Formation of calcium soaps (saponification)
- Infiltration by neutrophils with myeloperoxidase
Answer: C. In fat necrosis, pancreatic lipases break down triglycerides to fatty acids, which combine with calcium to form calcium soaps—visible as chalky-white areas. This is saponification. This type of necrosis is specific to enzymatic fat breakdown, distinguishing it from other forms. ---
Fat necrosis of the breast is clinically important primarily because
- It frequently progresses to invasive lobular carcinoma
- It can mimic carcinoma clinically and on mammography
- It indicates underlying BRCA1 mutation in young women
- It causes bilateral nipple discharge requiring urgent surgery
Answer: B. Fat necrosis produces a firm, sometimes calcified mass that can closely mimic carcinoma on examination and imaging. Biopsy is required to exclude malignancy. ---
Fat necrosis typically occurs in
- Acute pancreatitis
- Myocardial infarction
- Cerebral infarction
- Pulmonary infarction
Answer: A. Fat necrosis occurs when pancreatic enzymes (lipases) are released into the peritoneum in acute pancreatitis, breaking down fat cells. It also occurs in traumatic injury to adipose tissue such as breast tissue. --- ---
Fat necrosis typically occurs in
- Acute pancreatitis
- Myocardial infarction
- Cerebral infarction
- Pulmonary infarction
Answer: A. Fat necrosis occurs when pancreatic enzymes (lipases) are released into the peritoneum in acute pancreatitis, breaking down fat cells. It also occurs in traumatic injury to adipose tissue such as breast tissue. --- ---
Fat necrosis typically occurs in
- Acute pancreatitis
- Myocardial infarction
- Cerebral infarction
- Pulmonary infarction
Answer: A. Fat necrosis occurs when pancreatic enzymes (lipases) are released into the peritoneum in acute pancreatitis, breaking down fat cells. It also occurs in traumatic injury to adipose tissue such as breast tissue. --- ---