Surgical Science, 2011, 2, 363-365
doi:10.4236/ss.2011.27079 Published Online September 2011 (
Copyright © 2011 SciRes. SS
Hepatic Lipoma: Radiological Imaging Findings
Mustafa Koplay1, Alper Hacioglu2, Mustafa Cem Algin2
1Departme nt of Radiolo gy, Selcuklu Medical Faculty, Selcuk University, Konya, Turkey
2Department of General Surgery, Medical Faculty, Dumlupinar University, Kutahya, Turkey
Received November 26, 2010; revised March 21, 2011; accepted August 17, 2011
Hemangiomas and hepatic metastases are the leading reasons of echogenic masses on ultrasound (US)
evaluation of the liver. Lipomas of the liver are extremely rare and have been sporadically reported in the
literature during the last century. The present report describes a patient with hepatic lipoma together with
liver metastases from gastric adenocarcinoma. A 54 years old woman was refered to our department because
of abdominal pain. Patient has been operated for gastric adenocarcinoma 3 months ago she was evaluated
with US, computed tomography (CT) and magnetic resonance imaging (MRI).The abdominal US revealed a
12 × 10 mm echogenic mass with smooth borders in 7th segment of the liver. CT scan showed a hypodense
lesion in the same hepatic segment with fat dencity and no contrast involvement. MRI demonstrated the
same lesion on T1 and T2 weighted images as hyperintence mass. The final radiographic diagnosis was he-
patic lipoma. However, there was metastas in the liver of patient. Patient died 4 months later due to metas-
tatic gastric adenocarcinoma. Hepatic lipoma should be kept in mind in echogenic masses on US evaluation
of the liver.
Keywords: Lipoma, Liver, Different Diagnosis
1. Introduction
Although ultrasound (US) is the most used imaging mo-
dality in screaning of the focal liver lesions nowadays,
the US may not characterize the nodules indwelled in
liver and computed tomography (CT) scan, MRI and/or
needle biopsy may be required for differential diagnosis
[1]. Hemangiomas and hepatic metastases are the leading
reasons of echogenic mass on ultrasonographic evalua-
tion of the liver [2]. Hepatic lipomas appear as hypere-
choic masses on ultrasonographic evaluation. The etiol-
ogy of these lesions is not well defined and their clinical
manifestations vary a lot, but often they are asympto-
We report a case of patient with hepatic lipoma and
discuss the radiographic findings. Also we discuss dif-
ferential diagnosis of the hepatic lipoma.
2. Case Report
A 54 years old woman was refered to our department
because of mass in upper-outer quadrant of the right
breast and abdominal pain. Patient has been operated for
gastric adenocarcinoma 3 months ago and has been sub-
jected to total gastrectomy, esophagojejunostomy and
Braun anastomosis. Patient have moderate to severe
symptoms of bile reflux esophagitis and abdominal dis-
comfort and ascites. Tru-cut biopsy was performed on
breast mass and histopathologic examination was not
able to make differential diagnosis between primary
breast ductal carcinoma and metastatic gastric adenocar-
cinoma, but the primary breast tumor is eventual diagno-
sis. Quadrantectomy and axillar disection was planned,
but due to comorbid problems the operation was sus-
pended. The tumor staging examinations was performed.
The abdominal US revealed a 40 × 30 mm hypoechoic
mass in 5th segment and a 12 × 10 mm echogenic mass
in 7th segment of the liver [Figure 1]. It showed also
abdominal ascites. Due to metastatic suspicion an ab-
dominal CT scan was performed. CT scan demonstrated
a metastasis compatible hypodense mass with periferal
contrast involvement (50 HU) in 5th segment and hypo-
dense mass at fat density (80 HU) with no contrast in-
volvement in 7th segment of the liver [Figure 2]. For
futher evaluation an abdominal MRI was performed. T1
and T2 weighted images showed hyperintence lesion in
the 7th segment of the liver [Figure 3]. The final radio-
logical diagnosis was hepatic lipoma according to CT
Figure 1. US image shows the echogenic lesion in 7th seg-
ment of the liver (arrow).
Figure 2. CT axial image shows the hypodense lesion at fat
density (–80 HU) in the liver (arrow) and perihepatic as-
Figure 3. In MRI, T1 axial (a) and T2 coronal (b) weighted
images shows hyperintence lesion in liver (arrows).
and MRI findings.
During these examinations the physical condition of
the patient was gradually deteriorated and she died 4
months later.
3. Discussion
Hemangiomas and hepatic metastases are the leading
reasons of echogenic masses on ultrasonographic evalua-
tion of the liver. Hemangiomas are the most common
benign hepatic tumors and usually are below 3 cm in
diameter. Metastases are the most common malignant
tumors of the liver and generally are hypoechogenic, but
some gastrointestinal metastasis may appear echogenic.
If so, they are multiple and have periferal hypo or anech-
oic halo [2].
Hepatic lesions may contain macroscopic fat or intra-
cellular lipids. Macroscopic fat containing lesions of the
liver are angiomyolipoma, lipoma, liposarcoma, thera-
toma, pseudolipoma of the Glisson’s capsule, inrahepatic
pericaval fat, extramedullary hematopoiesis and metas-
tases. Lesions containing intracellular lipids are focal
steatosis, adenoma, focal nodular hyperplasia, regenera-
tive nodules and hepatocellular carcinoma [1,3].
Fat usually appears hyperechoic at US, although fat in
some regions may appear hypoechoic [4]. Fat attenuates
sound more than the adjacent liver parenchyma, so par-
tial acoustic shadowing may occur deep to fatty tumors.
Fat is of low attenuation (hypodense) compared with
normal liver parenchyma at computed tomography (CT),
with a range of –10 to –100 HU, and high in signal in-
tensity (hyperintence) on T1-weighted magnetic reso-
nance (MR) images [5]. In addition, several MR imaging
sequences aid in the detection of fat, including fat sup-
pression sequences (hypointence) and chemical shift im-
aging with opposed-phase gradient-echo sequences [6,7].
There are two masses with different imaging proper-
ties in the present case. One of them is compatible with
gastric cancer metastasis and the second is compatible
with hepatic lipoma, therefore both do not require sur-
Although some hepatic lipomas may mimick angiomi-
olipomas [8,9], they don’t carry malignant potential and
there are many characteristic findings on US, CT and
MRI, which are satisfactory evidences for hepatic lipoma
diagnosis. Therefore many authors do not recommend
more aggressive diagnostic procedures, such as needle
liver biopsy and operation [10]. We also believe that
awareness from characteristic imaging findings of he-
patic lipoma may prevent redundant invasive procedures.
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Copyright © 2011 SciRes. SS
Copyright © 2011 SciRes. SS
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