It is now widely accepted that lymphoma is a cancer of the lymphatic cells in the immune system and a type of blood cancer that develops when T or B lymphocytes of the white blood cells display uncontrolled proliferation and cellular immortality. Currently, a number of authors have published case reports or case series in which these lesions are defined as primary hepatic lymphoma. This minireview discusses several aspects of the entity of primary hepatic lymphoma, especially the dilemmas in diagnosis.
Keywords: Lymphoma, primary, hepatic, diagnosis, entity
Malignant lymphoma is a tumor disease originated from hematopoietic cells typically presented as an apparently circumscribed solid tumor of lymphoid cells.[1,2] It is now widely accepted that lymphoma is a cancer of the lymphatic cells in the immune system which protect the body against diseases and infection. It is a type of blood cancer that develops when T or B lymphocytes of the white blood cells display uncontrolled proliferation and cellular immortality.[3,4] Lymphoma is composed of cells that look naïve or resemble lymphocytes, histiocytes or plasma cells.[5,6] Sometimes the origin of the lymphoma can not be simply decided, like in the instance of natural killer-cell lymphoma or immunodeficiency-associated lymphoproliferative disorders.[7,8] Lymphomas are usually seen in lymph nodes, spleen, blood, bone marrow, brain, gastrointestinal tract and skin or other normal structures where lymphoreticular cells exist, but very rarely in the liver.[9-11] Lymphomas with disseminated disease may enter the blood stream and present as leukemia, notably of the lymphocytic type.[12,13] The classification of lymphoma is based on clinical manifestation, cell morphology, cytochemistry, genetics and immunophenotype to determine the entity with clinical significance. With the advance in imaging technology, more and more lesions of lymphoma were detected involving the liver at presentation. Currently, a number of authors have published case reports or case series in which these lesions are defined as primary hepatic lymphoma and described as a malignancy that is very rare and frequently misdiagnosed, but has a rather better prognosis by the combination of surgery and chemotherapy as the treatment than primary hepatic carcinoma.[15-17] This paper discusses several aspects of the entity of primary hepatic lymphoma, especially the dilemmas in diagnosis.
Classification of lymphoma
In 1965, Ata et al. reported, for the first time, a case of primary reticulum cell sarcoma of the liver. Later in 1971, Torres et al. described primary reticulum cell sarcoma of liver in cancer. Since then, cases and case series have been accumulated reporting the characteristics of primary hepatic lymphoma and stating that this disease is extremely rare with the absence of lymphoproliferative disease outside the liver.[20,21]
Some authors defined primary hepatic lymphoma as a very rare malignant tumor with the features of liver involvement and without involvement of other organs and tissues including bone marrow, lymph nodes, the spleen and peripheral blood until at least 6 months after diagnosis.[14,22] However, Caccamo’s criteria which many authors have cited for the diagnosis of primary hepatic lymphoma were proposed in 1986 and based on the data of a single patient who was complicated with liver cirrhosis, Kaposi’s sarcoma, and involvement of gastric mucosa and abdominal lymph nodes.[22,23] In many of the case reports, the patient follow-up was not long enough as “at least 6 months after diagnosis” and some diagnoses were determined just after the biopsy even when there were enlarged retroperitoneal lymph nodes and bone marrow infiltration by lymphoma.[11,14,15]
Is there indeed a disease entity named primary hepatic lymphoma? The definition of the word or special term “primary” is the key point to answer the question. The authors of this paper consulted several dictionaries and encyclopedias including online medical dictionaries, especially the National Institutes of Health’s Web site, i.e. MedlinePlus, produced by the National Library of Medicine. The definition of the word “PRIMARY” can be summarized in two explanations. The first one is general: first in order of time, place, development, or importance. However the second is medical: not derived from any other source or cause, especially the original condition or a group of symptoms in disease processes, such as a primary infection or a primary tumor, arising spontaneously (idiopathic, efforts to find the original tumor have failed), being an initial tumor or place specifically of cancer.
Some authors stated that primary hepatic lymphoma should be differentiated from hepatitis, hepatic metastasis, primary hepatic tumors and secondary hepatic lymphoma, however, they attempted to prove that a liver lymphoma was primary even when bone marrow or portal lymph nodes were involved and interpreted that this involvement was metastasis but not infiltration.[25,26]
Secondary hepatic lymphomas are defined by some authors as liver lymphomas with extra hepatic foci of lymphoma and found at the first onset or afterwards, or systemic lymphoma with secondary hepatic involvement. This description is also conflicting with the above definition of primary lymphoma.
The WHO classification of lymphoma is the generally accepted interpretation. In this system, lymphomas are classified by the normal cell type that looks most like the tumor and interpreting cytogenetic, molecular or phenotypic features. The three main groups are the T cell, B cell, and natural killer cell lymphomas. Less common groups are identified and listed in the subtypes. It has been debated that this classification needs validating in a large series of patients before publication.[2,3] Interestingly in this classification, the term “primary” is used but not specified, like primary effusion lymphoma, primary central nervous system lymphoma, etc., and a number of subtypes are described as “provisional entities” [Table 1].
Table 1: WHO classification subtypes of lymphomaClick here to view
Establishment of diagnosis
Clinical manifestations usually suggest diseases involving the liver but not the lymphatic and immune system.[29,30] Many cases are diffuse large B cell lymphoma and the patients show B-symptomatology of weight loss, fever, and night sweats, as well as fatigue and lethargy. Laboratory study on hepatitis virus infection and serum l-lactate dehydrogenase provides reference to treatment rather than diagnosis of lymphoma. Serum levels of α-fetoprotein and other common tumor markers are usually normal.[31,32] Imaging modalities are very important tools for detecting liver tumors and lymphoma, although the majority of the diagnoses of liver lymphoma are established afterwards which is quite different from the imaging diagnosis of mediastinal or retroperitoneal lymphoma.
For evaluating primary liver tumors, currently useful image modalities include ultrasound, computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography and computed tomography (PET/CT), and digital subtraction angiography (DSA). The following description of these modalities is mainly based on the results from retrospective studies.
Ultrasound is the most sensitive of image modalities to find liver lymphoma showing hypoechoic liver lesion with irregular margins. When contrast is used, the tumor is inhomogeneously hyperenhanced in the arterial phase and hypoenhanced in the portal and late phases, similar to the images of hepatocellular carcinoma.
Lymphomas detected in the liver by plain CT scan usually present as homogeneous shadows of low density, with irregular demarcations. A very low density area in the center might indicate necrosis. When 3-phase contrast-enhanced scan is used, the lesions will not be enhanced at the arterial and portal phase, and will be slightly enhanced at the delayed phase with a border sharply contrasted with the normal neighboring tissue. Some liver lymphomas reported as primary or secondary may shrink or vanish after treatment when demonstrated by CT scan, but no change in density or enhancement of the remaining lesions are found. In addition, diffuse liver infiltration by lymphoma can be detected by CT scan only when there are areas of density change in the swelling liver. But lymphoma infiltration without density change in an enlarged liver cannot be revealed by CT. It is impossible, of course, to definitely exclude lymphoma infiltration within a liver which is normal in size and CT density. CT is now commonly used for lymphoma staging.[15,36]
Liver lymphomas present heterogeneous signals on MRI image with features of hypointense in T1-weighted sequences but hyperintense in T2-weighted sequences. Although MRI has the advantage in specifically characterizing liver lesions over all other imaging modalities, it often fails to distinguish primary hepatic lymphoma from other liver masses. In a report, MRI presented almost the same imaging features for lymphoma and sarcoidosis.
PET/CT is used to improve the detection range, response evaluation, and prognosis prediction of lymphoma. With the help of 18F-fluorodeoxyglucose (FDG), this modality provides high sensitivity in evaluating most liver lesions and is invaluable for finding extrahepatic lesions. However, false positive findings are common in inflammatory or metastatic lesions.[38,39] However, the problem of specificity can be partially solved by percutaneous needle biopsy.
Celiac trunk angiography of known lesions shows very scarce contrast staining, tiny feeding arteries, obvious shifting of the hepatic artery/its tributaries, and the absence of enlarged tumor blood vessels. When a small amount of lipiodol is injected into the feeding arteries during the DSA procedure, no deposit of lipiodol can be observed in the lesions.
None of the above modalities produce specific image features for the diagnosis of liver lymphoma. Other than explorative laparotomy, puncture biopsy under the guidance of ultrasound or CT is of paramount importance for establishing the diagnosis of liver lymphoma by acquiring specimens for pathological and immunohistochemical examination. Moreover, core puncture needle is much more reliable than fine needle to obtain adequate samples for study.
Pathology and immunohistochemistry
The clinical diagnosis is usually established by a pathologist (commonly a hemato-pathologist) after the examination of the biopsy specimens. Hematoxylin and eosin stain of liver specimen may show infiltration of large lymphoid cells. Immunohistochemistry may show positive Ki67, positive CD3, CD5, CD30, CD40, etc. Fluorescence in situ hybridization is applied for tumor genetics and flow cytometry is used for quantitative analysis of cells. The pathological classification of subtypes is essential for treatment decision and outcome prediction [Table 2]. On the other hand, newly developed lesions in the liver of lymphoma patients can not be the same disease, as other kinds of tumor may occur because of immune compromise or liver diseases.
Table 2: Several pathological subtypes of lymphomas and their possible immunophenotypesClick here to view
Liver is a poor “soil” for malignant lymphoma as a “seed” to grow. Most reports about primary hepatic lymphoma are published in the form of case studies and no prospective researches have been found till now. It is difficult for the radiologist to define lymphomas in the liver as primary or secondary, even when they really are lymphomas. The differentiation of primary lymphoma from secondary also puzzles the pathologist and all involved multidisciplinary oncological specialists. That another malignant tumor may develop in the liver of patients with lymphomas makes things more complicated.
Most of the reported cases are diffuse large B cell lymphomas but this type is usually aggressive and involves multiple organs. In addition, according to the above definition provided by some authors, the establishment of the diagnosis of primary hepatic lymphoma is a retrospective process that should be decided at least 6 months after the initial diagnosis of lymphoma. So, the diagnosis of primary hepatic lymphoma at first liver biopsy is problematic and conflicting with this definition.
Lymphomas are often detected in the liver by CT incidentally or general screening for lesions in the patients. The term “primary hepatic lymphoma” is imprecise and less informative for referral to a proper treatment and can be confused with the subtype hepatosplenic T cell lymphoma of WHO classification. Current criteria for the diagnosis of primary hepatic lymphoma are outdated. The differentiation must be made between primary and secondary disease at first, and efforts should be directed to find the original tumor. This “provisional entity” is still controversial, and additional researches and discussions on criteria for its diagnosis are warranted to clarify their significance for consensus and refinement.
Collection of literature data: F. Xiong
Design, writing and revision of the paper: Y.S. Guan
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
There is no patient involved.
This review paper is waived for ethics approval.
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