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Case Reports
. 2010 Apr;39(3):392-7.
doi: 10.1097/MPA.0b013e3181bd2923.

Lipomatous pseudohypertrophy of the pancreas: a clinicopathologically distinct entity

Deniz Altinel  1 , Olca Basturk, Juan M Sarmiento, Diego Martin, Michael J Jacobs, David A Kooby, N Volkan Adsay
Affiliations
Case Reports

Lipomatous pseudohypertrophy of the pancreas: a clinicopathologically distinct entity

Deniz Altinel et al. Pancreas. 2010 Apr.

Abstract

Objectives: Owing to the challenges in obtaining pancreatic biopsies, pancreatic resection for presumed malignancy is often performed without histological confirmation. As a result, benign lesions are sometimes surgically removed. One such condition, which is poorly defined in the literature, is referred to as lipomatous pseudohypertrophy (LPH) of the pancreas.

Methods: Five cases of LPH were analyzed.

Results: Four patients underwent surgical resection, 3 of which were diagnosed preoperatively by radiology as having ductal adenocarcinoma. The fourth case was correctly interpreted by magnetic resonance imaging as LPH, but the patient underwent resection because of the intractable pain due to pancreatitis. The fifth patient has been placed on watchful waiting.Two tumors were in the pancreatic head, one in the tail, one in the uncinate process, and one demonstrated diffuse involvement. Microscopically, they were characterized as having normal lipocytes without lipoblasts or inflammation. Within the adipose tissue, scattered microscopic foci of pancreatic parenchyma could be seen.

Conclusion: Lipomatous pseudohypertrophy of the pancreas is a distinct entity characterized by localized/diffuse replacement of pancreatic parenchyma with mature adipose tissue. It forms a pseudotumor that may be difficult to distinguish clinically from pancreatic adenocarcinoma. This entity should be considered when evaluating patients with a new diagnosis of a hypodense pancreatic neoplasm on imaging.

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Figures

FIGURE 1
FIGURE 1
The pancreas is predominantly replaced by fatty tissue.
FIGURE 2
FIGURE 2
Tumor pushing into the adjacent pancreas is seen.
FIGURE 3
FIGURE 3
The tumor is well circumscribed, separated from the adjacent normal adipose tissue by a thin rim of fibrous pancreatic tissue.
FIGURE 4
FIGURE 4
Scattered islets amid the adipose tissue.
FIGURE 5
FIGURE 5
Scattered acini within the adipose tissue.
See this image and copyright information in PMC

References

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