Difference between revisions of "IPLab:Lab 1:Fat Necrosis"

Revision as of 09:36, 25 August 2016

Clinical Summary

This was a 37-year-old female with chronic renal failureRenal failure is the severe reduction of renal function and often leads to reduced urinary output. that necessitated a renal transplant. Following transplantation, the patient developed a herpes simplex virus (HSV) infection in her nasal cavity, oral candidiasisCandidiasis is an infection by the fungus Candida in the oral cavity., pneumoniaIn alcoholics, aspiration pneumonia is common--bacteria enter the lung via aspiration of gastric contents., hematuriaHematuria is the presence of blood in the urine., pyuriaPyuria is the presence of white blood cells (pus) in the urine., and gastrointestinal bleeding. Subsequently, the patient became septicSepsis is the presence and persistence of pathogenic microorganisms and their toxins in the blood. and died.

Autopsy Findings

Major findings at autopsy included extensive hemorrhagic bronchopneumonia (Pseudomonas aeruginosa) and multiple ulcers affecting the stomach and esophagus. There was also evidence of disseminated intravascular coagulationDIC is the development of small thrombi within the microcirculation throughout the body. (DIC) with multiple hemorrhages present. Firm, whitish foci of necrotic tissue were found in the fat around the pancreas.

Images

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  This gross photograph shows the intestines and omentum at autopsy. Note the small (5-15 mm in diameter) white nodules on the surface of the omental and mesenteric fat tissue (arrows).

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  This gross photograph of the pancreas from this case shows white nodules (arrows) in the pancreas and the adjacent mesenteric fat tissue.

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  This low-power photomicrograph of the pancreas from this case shows the fat tissue (1) surrounding the pancreas. Note the rim of inflammatory cells (arrows) and the blue areas in the fat adjacent to the pancreas (2).

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  This high-power photomicrograph shows areas of inflammation (1) and fat necrosis (arrows) in the peripancreatic fat tissue (2) of the pancreas from this case.

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  Another high-power photomicrograph shows blue discoloration in the fat tissue in the interlobular spaces (1) of the pancreas.

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  A higher-power photomicrograph of the previous slide contains a small area of fat necrosis (1) in the upper right portion of the image. The fat necrosis is within the fat tissue that is normally found adjacent to the pancreas. The appearance of the pancreatic tissue in this area is somewhat disrupted due to autolysis (the pancreas autolyzes very rapidly after death) but there is some premortem necrosis as well.

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  This is a higher-power photomicrograph of the fat necrosis involving the fat cells in the interlobular spaces (arrow) of the pancreas. Note the blue to purple staining of the calcium deposits within the fat cells.

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  This high-power photomicrograph demonstrates fat necrosis in the interlobular spaces of the pancreas. Note the granular blue-staining calcium deposits (arrows) within the fat cells. The clear areas represent artifact caused by the "washing-out" of fat from cells during tissue processing for histology.

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  This is another high-power photomicrograph demonstrating the calcification (arrows) seen in fat necrosis involving the interlobular spaces of the pancreas.

Virtual Microscopy

Pancreatic Fat Necrosis

Normal Pancreas

Study Questions

• What is the definition of enzymatic fat necrosis?

• Where else can enzymatic fat necrosis occur besides the pancreas?

• What causes the formation of the white, chalky, nodules that are seen in the fat tissue adjacent to the pancreatic tissue?

Additional Resources

Reference

• eMedicine Medical Library: Emergent Management of Pancreatitis
• Merck Manual: Acute Pancreatitis

Journal Articles

• Bhatnagar A, Wig J, Vaiphei K, Majumdar S. Intracellular cytokines in cells of necrotic tissue from patients with acute pancreatitis. Eur J Surg 2001 Jul;167(7):510-7.
• LeWinter MM. Acute Pericarditis. NEJM 2014 Dec 18;371:2410-2416.

Images

• PEIR Digital Library: Pancreas Images
• WebPath: Cellular Injury Images