Abstract
Background
Recently, there has been a growing interest in solid benign liver tumors as the understanding of the pathogenesis and molecular underpinning of these lesions continues to evolve. We herein provide an evidence-based review of benign solid liver tumors with particular emphasis on the diagnosis and management of such tumors.
Methods
A search of all available literature on benign hepatic tumors through a search of the MEDLINE/PubMed electronic database was conducted.
Results
New diagnostic and management protocols for benign liver tumors have emerged, as well as new insights into the molecular pathogenesis. In turn, these data have spawned a number of new studies seeking to correlate molecular, clinicopathological, and clinical outcomes for benign liver tumors. In addition, significant advances in surgical techniques and perioperative care have reduced the morbidity and mortality of liver surgery. Despite current data that supports conservative management for many patients with benign liver tumors, patients with severe preoperative symptomatic disease seem to benefit substantially from surgical treatment based on quality of life data.
Conclusion
Future studies should seek to further advance our understanding of the underlying pathogenesis and natural history of benign liver tumors in order to provide clinicians with evidence-based guidelines to optimize treatment of patients with these lesions.
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Abbreviations
- HCA:
-
Hepatocellular adenoma
- FNH:
-
Focal nodular hyperplasia
- IHCA:
-
Inflammatory HCA
- CT:
-
Computed tomography
- MRI:
-
Magnetic resonance imaging
- OCP:
-
Oral contraceptive
- MODY:
-
Maturity onset diabetes of the young
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Dr. Margonis and Dr. Ejaz contributed equally to the production of this manuscript.
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Supplemental Fig. 1
Hemangioma in a 49 year old female. (A) MR coronal thick slab reconstruction better demonstrates enhancing nodules (arrows) at the periphery of the lesion. Incidental note is made of a replaced right hepatic artery (arrowhead) arising from the superior mesenteric artery. The enhancing nodules continue to fill in the portal venous phase (B). Axial T1-weighted images in the hepatic arterial phase (C), portal venous phase (D), and delayed phase (E) show flame-shaped enhancement increasing centrally (arrowheads), characteristic of hemangioma. (GIF 189 kb)
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Supplemental Fig. 2
Focal nodular hyperplasia in a 27 year old female. Ultrasound in the coronal plane (A) shows a subtle slightly echogenic mass in the right lobe of the liver (arrows). Axial MR T2-weighted (B) images show subtle isointense lesion (arrow) in the right lobe. Axial CT in the hepatic arterial phase (C) shows a homogeneously enhancing nonencapsulated mass (arrow) that becomes iso to slightly hypodense to liver parenchyma in the portal venous phase (D). (E) Delayed (10 minute) phase of enhancement using a hepatobiliary contrast agent demonstrates increased uptake within the lesion (arrow). (GIF 153 kb)
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Supplemental Fig. 3
Hepatocellular adenoma in a 37 year old female. Axial MR T-1 out of phase image of the liver (A) shows significant signal loss of the liver mass (arrow). T1-weighted MR image in the portal venous phase (B) shows a heterogeneously enhancing mass. (GIF 178 kb)
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Supplemental Fig. 4
Nodular regenerative hyperplasia in a 77 year old male with 30-year history of primary biliary cirrhosis. MRI shows multiple masses (arrows) that are hyperintense to the liver parenchyma on T-1 weighted unenhanced image (A) and are isointense to liver parenchyma on T-2 weighted images (B). Subtraction images show minimal signal within the lesions confirming the lack of enhancement (C). There is no wash out of contrast on T1-weighted images in the portal venous phase (D). These findings are consistent with nodular regenerative hyperplasia. (GIF 172 kb)
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Supplemental Fig. 5
Biliary hamartomas in a 69 year old female. Axial CT of the liver shows numerous small uniform hypodense lesions scattered throughout both lobes (A). Axial T2-weighted image better demonstrates innumerable small hepatic lesions that are very bright with no septation or nodularity (B). Coronal maximum intensity projection image reconstructed from thin slice T2-weighted images shows the extent of hepatic involvement. The common bile duct (arrow) and the gallbladder (arrowhead) are also seen (C). Lack of internal enhancement was confirmed on T1-weighted image in the portal venous phase (D). (GIF 192 kb)
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Supplemental Fig. 6
Angiomyolipoma in a 44 year old female. Axial CT in the hepatic arterial phase (A) and portal venous phase (B) show an indeterminate hypervascular mass with a low attenuation rim (arrow). Axial MR T-1 weighted images of the liver show the mass (arrow) to be hyperintense on the in-phase acquisition (C) with significant signal loss on the out of phase acquisition (D), indicating the presence of lipid. The mass (arrow) has early central enhancement on the hepatic arterial phase (E) and persists in the portal venous phase (F). These findings are consistent with an angiomyolipoma. (GIF 156 kb)
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Supplemental Fig. 7
Plexiform neurofibroma in a 12 year old male. Axial T2-weighted image shows a large hyperintense mass infiltrating the periportal region (arrows), with extensive involvement of both hepatic lobes (A). Central flow void within the tumor (arrowhead) represents a branch of the portal vein. The periportal distribution is the hallmark of liver involvement. Internal enhancement (arrows) is noted on T1-weighted post contrast image (B). The diagnosis was confirmed at biopsy, and is usually associated with neurofibromatosis Type 1. However in this patient it was incidental. (GIF 174 kb)
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Margonis, G.A., Ejaz, A., Spolverato, G. et al. Benign Solid Tumors of the Liver: Management in the Modern Era. J Gastrointest Surg 19, 1157–1168 (2015). https://doi.org/10.1007/s11605-014-2723-x
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DOI: https://doi.org/10.1007/s11605-014-2723-x