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A primary retroperitoneal anaplastic lymphoma kinase-positive anaplastic large cell lymphoma with tumor thrombosis
Authors Li J , Tian X, Wang M, Liu W, Guo X, Wang K, Nong L, Wang W, Yang Y
Received 9 August 2018
Accepted for publication 9 November 2018
Published 12 December 2018 Volume 2018:11 Pages 9007—9011
DOI https://doi.org/10.2147/OTT.S183298
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 4
Editor who approved publication: Dr Arseniy Yuzhalin
Jisong Li,1 Xiaodong Tian,1 Mangju Wang,2 Wei Liu,2 Xiaochao Guo,3 Ke Wang,3 Lin Nong,4 Wei Wang,4 Yinmo Yang1
1Department of General Surgery, Peking University First Hospital, Beijing, China; 2Department of Hematology, Peking University First Hospital, Beijing, China; 3Department of Radiology, Peking University First Hospital, Beijing, China; 4Department of Pathology, Peking University First Hospital, Beijing, China
Abstract: Anaplastic lymphoma kinase (ALK)-positive anaplastic large cell lymphoma (ALCL) is a T cell subtype of non-Hodgkin’s lymphoma (NHL). Typically, lymphoma rarely infiltrates vascular structure. In this article, we present a case of retroperitoneal ALK-positive ALCL with splenic venous tumor thrombosis. A 62-year-old patient presented to our institute with the symptoms of epigastric pain, abdominal distension, and reduced bowel movement. Physical examination indicated no enlarged peripheral lymph nodes or abdominal mass. Laboratory workup revealed granulocytosis, abnormal coagulation function, and normal level of lactic dehydrogenase (LDH). Contrast-enhanced computed tomography (CT) showed a retroperitoneal mass with involvement of pancreas and duodenum and formation of splenic venous tumor thrombus. Ultrasonography-guided retroperitoneal lesion biopsy confirmed the diagnosis of ALK-positive ALCL. The patient was able to tolerate oral intake after two cycles of chemotherapy and showed no sign of lymphoma by positron emission tomography (PET)-CT after the fourth cycle of chemotherapy. In spite of its rarity, lymphoma should be taken into account as a differential diagnosis of other malignancies with tumor thrombosis.
Keywords: anaplastic lymphoma kinase, anaplastic large cell lymphoma, primary retroperitoneal lymphoma, tumor thrombosis
Introduction
Anaplastic large cell lymphoma (ALCL) is a subtype of non-Hodgkin’s lymphoma (NHL), which derives from cytotoxic T cell phenotype.1 Anaplastic lymphoma kinase (ALK)-positive ALCL harbors an ALK-fusion gene, typically via t(2;5)(p23;35), resulting in an NPM-ALK chimeric protein with constitutive tyrosine kinase activity.2 ALK-positive ALCL constitutes about 3% of adult NHL, and nodal and extranodal manifestations are commonly seen.3 Lymphoma often encompasses vessels, but seldom infiltrates them, known as the “sandwich” sign or “computed tomography (CT) angiogram” sign.1–3 Tumor thrombosis is an extremely rare presentation in lymphoma.3 In this article, we present a case of retroperitoneal ALK-positive ALCL causing duodenal stenosis, with tumor thrombus in splenic vein.
Case presentation
This study was approved by the ethics committee of Peking University First Hospital. Written informed consent has been provided by the patient to have the case details and any accompanying images published. A 62-year-old male patient presented to the local hospital with a 1-month history of epigastric pain, abdominal distension, and reduced bowel movement. He denied any fever or drenching night sweats. Abdominopelvic CT scan revealed a retroperitoneal mass beneath the body of pancreas compressing duodenum and the formation of splenic venous tumor thrombus. CT-guided retroperitoneal lesion biopsy was performed, and pathological analysis revealed the possibility of malignant tumor. He was inserted with a nasogastric tube and supported by parenteral nutrition. For further treatment, he was transferred to our tertiary care center. He had a past history of diabetes mellitus type II managed by diet and exercise and spinal dural arteriovenous fistulectomy. Physical examination revealed normal vital signs, no peripheral lymph node enlargement, or palpable abdominal mass.
Laboratory tests showed a striking abnormality of white blood cell count of 18.4×109/L (normal, 3.5–9.5×109/L) and neutrophil cell count of 15.80×109/L (normal, 1.8–6.3×109/L). Coagulation abnormality was obvious as prothrombin time (PT) was prolonged by 7.1 seconds and international normalized ratio (INR) approached 1.81 (normal, 0.89–1.13). Erythrocyte sedimentation rate (ESR) was 80 mm/h (normal, 0–15 mm/h). Lactic dehydrogenase (LDH), CA19-9, and CA242 were normal, while CA125 was slightly elevated (47.27 U/mL; normal, <35.0 U/mL).
Abdominopelvic contrast-enhanced CT was suggestive of an amorphous conglomerated hypoattenuating mass underneath the body of pancreas compressed and infiltrated the third segment of duodenum. Splenic vein was not visible, and a longitudinal mildly enhanced mass was seen along and behind the body and tail of pancreas, clotting the superior mesenteric vein-portal vein (SMV-PV) confluence. Lymph nodes at the root of the mesentery and retroperitoneal region enlarged, and some were fused into bulky masses with indistinctive boundaries with aorta (Figure 1).
As the coagulation function improved by the supplement of vitamin K, the patient underwent a second percutaneous core needle biopsy of the retroperitoneal tumor guided by ultrasonography. The pathological analysis showed atypical tumor cells with ovoid or irregular (eg, kidney shaped) nuclei packed in sheets with intrasinusoidal infiltration. Immunohistochemistry (IHC) staining was performed using DAKO EnVison™ detection kit (Dako Denmark A/S, Glostrup, Denmark) and a panel of antibodies. The percentage of positive cells was semiquantitatively estimated and scored as follows: negative (−): <5% cells; weakly positive (+): 6%–30% cells; moderately positive (++): 31%–75% cells; strongly positive (+++): >75%. IHC analysis showed the following results: EMA+++, vimentin+++, LCA++, CD43+++, CD3-, CD20-, CD79a-, CD30+++, CD68 (KP1)-, CD56+, CD4++, CD8-, TIA1+, granzyme B++, ALK (CD246)-, ALK (1A4)+++ (nuclear/cytoplasmic), Ki67 70% (Figure 2). Fluorescence in situ hybridization (FISH) detected ALK (2p23) gene rearrangement. The peripheral blood smear and lymphocyte subgroup analysis by FISH revealed no immature cells. Bone marrow smear and bone marrow aspiration revealed no evidence of lymphoma involvement.
Ultrasonography, chest X-ray, and thoracic CT detected neither peripheral nor mediastinal involvement. The final diagnosis was considered as primary retroperitoneal ALCL (stage IV) with duodenal obstruction and splenic venous tumor thrombosis. No source of infection was found in spite of leukocytosis, and broad-spectrum antibiotics had limited effects.
Following the initiation of CHOEP-21 regimen chemotherapy (cyclophosphamide 1.4 g day (d)1, doxorubicin 40 mg d1, vincristine 4 mg d1, etoposide 100 mg d1–d3, and prednisolone 15 mg d1–d5, a cycle contained 21 days, and the patient underwent a total of eight cycles of chemotherapy), leukocyte count decreased significantly and was 4.51×109/L before the second cycle. The patient was able to tolerate oral intake after the second cycle. Positron emission tomography-CT (PET-CT) showed no sign of lymphoma after the fourth cycle of chemotherapy (Figure 3). A contrast-enhanced CT was repeated after the sixth cycle of chemotherapy, and retroperitoneal masses and lymph nodes disappeared or shrank evidently to normal size compared to the previous CT scan. SMV and splenic veins were still occlusive with slightly enhanced thrombus, but the size of thrombus shrank (Figure 1). The patient was discharged after eight cycles of chemotherapy. He has lived for 4 months with no evidence of recurrence.
Discussion
ALK-positive ALCL is often at stage III or IV upon diagnosis, with frequent involvement of both lymph nodes and extranodal sites.4 In our case, lymphoma extended to retroperitoneal lymph nodes and two extranodal organs, ie, pancreas and duodenum, causing difficulty in differentiating its origin. Primary retroperitoneal lymphoma arises in the retroperitoneal space but outside the major retroperitoneal organs.1 Roughly, 55% of adults with retroperitoneal NHL have involvement of para-aortic lymph nodes.4 In our case, the dominant mass was outside pancreas and duodenum and contiguous with para-aorta lymphadenopathy, without peripheral, mediastinal, or bone marrow involvement. Therefore, we postulated that the lesion was primary retroperitoneal lymphoma. It was reported that diffuse pancreatic involvement causes organ enlargement as well as irregular peripancreatic fat infiltration with no other evidence of pancreatitis,5 as shown in our case. The pancreas was contiguous with the tumor, both supplied by the dilated dorsal pancreatic artery, the first branch of splenic artery. These signs suggested that the retroperitoneal lymphoma extended to peripancreatic lymph nodes and even the pancreatic parenchyma. Although the patient presented to our department with the symptoms of duodenal obstruction and CT scan showed the thickening of posterior duodenal wall and luminal constriction of third segment of duodenum, the typical sign in primary gastrointestinal lymphoma was circumferential thickening of bowel wall.5 It seemed that duodenum was secondarily infiltrated by the compressing retroperitoneal lymphoma rather than a primary lesion.
Lymphoma tends to encase the vascular structure around it but seldom invades.1,3,6 Tumor thrombosis is an extremely rare manifestation in lymphoma. As far as we know, only 29 cases of extravascular lymphoma with tumor thrombosis formation have been reported in English literatures.3,7–10 The most common pathology is diffuse large B cell lymphoma (DLBCL). Only one case has been reported with the pathology of T cell lymphoma (mycosis fungoides).3 Our case is the first case of ALK-positive ALCL with tumor thrombosis. The mechanism of the formation of tumor thrombus is mostly presumed as direct extension from a dominant nodal or extranodal mass in the vicinity,3 except one reported case of vascular metastasis from splenic lymphoma.8 It is important to differentiate tumor thrombosis from primary lymphoma of a vein and intravascular lymphomatosis (IVL). Primary lymphoma of a vein is a highly unusual type of lymphoma centered within a vein, which originates from the vessel wall.11,12 However, IVL is a rare type of extranodal large B cell lymphoma characterized by the selective growth within small vessels, particularly capillaries.2 In our case, the splenic venous tumor thrombosis had no distinct boundary with the superior border of the dominant extravascular lesion, thus we assumed that lymphoma infiltrated the splenic vein directly. We noticed that the CT value of the thrombus enhanced from the plain phase gradually to the delayed phase at the SMV-PV confluence, whereas the enhancement of thrombus at the tail of pancreas was less obvious. The size of spleen was normal, and pelvic ascites was minimal, probably because of the slow formation of tumor thrombus and the well-developed collateral circulation.13 PET-CT showed no sign of lymphoma, but CT revealed that the downsizing thrombus was slightly enhanced after four to six cycles of chemotherapy, which could be attributed to the organization of the mixed thrombus.
Chemotherapy is the major treatment for ALCL at stage III/IV. The initial regimens are recommended as CHOP (cyclophosphamide, doxorubicin, vincristine and prednisone) or CHOEP (cyclophosphamide, doxorubicin, vincristine, etoposide and prednisone).14 LDH, CD56, and International Prognostic Index (IPI) are useful clinicopathological parameters in predicting outcome.14–16 In this case, the patient had positive CD56 expression, but serum LDH was normal. The patient’s IPI was 3 (high–intermediate-risk group), with a 5-year overall survival time estimated to 21%.16
Since the patient’s bone marrow was not involved by lymphoma, we associated the patient’s leukocytosis with paraneoplastic leukocytosis. Unlike leukemic phase of lymphoma, the peripheral blood is free of circulating lymphoma cells in paraneoplastic leukocytosis. The mechanism of this phenomenon is the overexpression of cytokines (IL-22, IL-17, G-CSF, TNF-a, etc.) in ALK-positive ALCL, facilitating the maturation and proliferation of granulocytes.17 Paraneoplastic leukocytosis is postulated as an ominous sign of aggressive clinical course and dismal prognosis.17–19 Due to the recent discharge of our patient, further observation and close follow-up are required to monitor his survival.
Conclusion
ALCL with tumor thrombosis is rare and warrants biopsy to be differentiated from other malignancies.
Acknowledgment
This study was supported in part by grants from the National Natural Science Foundation of China (nos. 81372605, 81672353, and 81572339).
Disclosure
The authors report no conflicts of interest in this work.
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