Diffuse large B-cell lymphoma presenting with neurolymphomatosis and intravascular lymphoma: a unique autopsy case with diverse neurological symptoms
© Yamada et al.; licensee BioMed Central Ltd. 2012
Received: 24 July 2012
Accepted: 5 August 2012
Published: 13 August 2012
A 78-year-old Japanese male noticed a difficulty in the beginning of standing up, followed by 7a progressive numbness of extremities with pain, Bell’s palsy, dysarthria, and difficulty in swallowing. A clinician had suspected cancer of unknown primary origin, accompanied by the diverse and elusive neurological symptoms, likely presenting as painful mononeuropathy simplex and cranial neuropathy. He developed dysbasia over weeks and died 1 month after the symptom onset. At autopsy, an ill-defined large and soft tumor mass in the right lobe of the liver with direct invasion into the right adrenal gland was observed. The left adrenal gland or right iliopsoas muscle was also involved. Microscopic findings showed a monotonous proliferation of medium-sized to large atypical lymphoid cells, which were diffusely positive for CD20 in immunohistochemistry, consistent with diffuse large B-cell lymphoma (DLBL). Furthermore, the lymphoma cells aggressively infiltrated endoneurial and subperineurial spaces not only in the peripheral nerves and plexuses, but partly in the spinal nerve roots, and intravascular spaces in various tissues. Therefore, systemic lymphoma (DLBL) complicated with neurolymphomatosis (NL) and intravascular lymphoma (IVL) was diagnosed. Very early diagnosis and treatment are necessary for the NL patients with poor prognosis.
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KeywordsNeurolymphomatosis (NL) Peripheral nerve Intravascular lymphoma (IVL) Diffuse large B-cell lymphoma (DLBL)
Infiltration of the peripheral nerves by lymphoma cells was termed neurolymphomatosis (NL). In 1907, Marek described a disease of Orpington roosters , in which the peripheral nerves were infiltrated by lymphocytes, that was tentatively proposed the term NL by Pappenheimer et al., later . Although there had been debated about the propriety of this term [3, 4], NL is currently defined as a demonstration of lymphomatous infiltration of the peripheral nerves, representing a unique subtype of extranodal lymphoma , and is the least common neurological manifestation of lymphoma. From the comprehensive study by Barron et al., between 8.5% and 29% of non-Hodgkin lymphomas, nearly always B-cell lymphomas infiltrated the nervous systems and an estimated 10% of those involved the peripheral nervous system (PNS) on the dignosis of NL. Additionally, approximately one-half cases had widespread systemic lymphoma found at the time of autopsy and 5% had central nervous system (CNS) involvement [4, 6]. By contrast, the involvement of a single peripheral nerve or plexus at the only site of malignant lymphoma in NL patients rarely has been reported, and the majority of them has coexistent multiple sites involvement [7–10], including spinal nerve roots (48%), cranial nerves (46%), and plexuses (40%), as more recently described . NL must be separable from more common lymphoma-related neurologic manifestations, such as compression of peripheral nerves by an enlarged lymph node or soft tissue mass, or lymphoma-related non-tumor disorders, e.g., irradiation, chemotherapy, paraneoplastic syndrome, antibody-mediated nerve damage or vasculitis [4, 5, 8, 11]. On the other hand, intravascular lymphoma (IVL) is also considered to be a rare type of extranodal large B-cell lymphoma, characterized by the proliferation of atypical lymphoid cells in the lumina of small vessels in various organs without tendency to form tumors . Recently, it has been suggested that IVL might have a predilection not only for the vessels but for both the CNS and PNS, i.e., the complication with NL .
We reported a rare and unique autopsy case of malignant lymphoma complicated with NL and IVL, which clinically presented as progressive painful mononeuropathy multiplex and cranial neuropathy.
At autopsy, the liver, weighing 1,540 g, was involved by an ill-defined whitish soft mass in the right lobe (S5-S6), together with direct invasion into the right adrenal gland (80 g). The enlarged left adrenal gland (100 g) and right iliopsoas muscle were also involved. Multiple and relatively small nodular tumor lesions, in left lower lobe of the lung, pericardium, and lymph nodes of colonic serosa, mesenterium and para-pancreas were recognized. In addition, a splenomegaly was noted, weighing 350 g. The brain could not be examined due to the family’s objections.
NL is characterized by lymphomatous infiltration of PNS. From the first report of the large series of NL by Diaz-Arrastia et al., the most common clinical presentation was progressive sensorimotor neuropathy, although less common syndromes including Guillain-Barre, focal peroneal or sciatic neuropathy, a relapsing neuropathy, cauda equina syndrome and multiple cranial neuropathy were described. Therefore, clinicians should consider several differential diagnoses, such as leptomeningeal lymphomatosis, nerve damage from herpes zoster, chemoradiotherapy, nerve root compression, lymphoma-associated vasculitis, or paraneoplastic syndromes . The patterns of clinical presentations in NL are categorized into four: 1) painful involvement of nerves or roots, 2) cranial neuropathy with or without pain, 3) painless involvement of peripheral nerves and 4) painful or painless involvement of a single peripheral nerve.5 The present case showed complicated and mixed type of these four characteristics. In contrast, IVL is also known to show the diversity of non-specific clinical symptoms, including fever elevation, respiratory distress, and neurologic abnormalities, e.g., sensory and motor deficits or altered consciousness . In the current case, it is very difficult to make it clear to distinguish IVL-induced neurological signs from NL-induced ones, since detailed gross and microscopic examinations have never been performed within limited specimens obtained. Additionally, most of previous studies have not addressed PNS involvement in patients with IVL, however, Matsue et al., based on the collection of 4 IVL patients complicated with NL, have described that it is very likely that IVL has a predilection not only for the vascular vessels but for the PNS . Despite the extreme rarity of IVL, DLBL complicated with IVL and NL may be more common than generally considered.
Odabasi et al. reported a review of 52 NL cases that approximately one-half of them had also widespread systemic lymphoma found at the time of autopsy . The diagnosis in many cases had been difficult, since a multidisciplinary approach for obtaining an adequate biopsy specimen of the suspected nerve was required for clinicians. Moreover, it is well known that the prognosis is very poor due to the progressive characteristics, as shown in the present case. When NL occurs in the context of established malignant lymphoma, the main cause of death is disseminated disease with associated multiple organ failure, but respiratory failure secondary to severe neuropathy might also occur . Thus, early and accurate diagnosis and aggressive treatment (e.g., high-dose chemotherapy and/or radiation therapy) can increase their survival rates [4, 5, 9, 11, 14]. MRI would be essential and helpful to diagnose, because it can detect the number of the NL lesions and the extent of NL involvement. From the previous report by Amar Swarnkar et al., MRI showed mild persistent enlargement, hyperintensity on T2-weighted images and enhancement after gadolinium administration in the involved nerves. However, these radiographic findings are nonspecific and nondiagnostic, very similar to our case. More recently, PET scanning is considered to be a useful diagnostic tool to evaluate the distribution of involvement for patients with suspected NL, but is even unlikely to be 100% positive and at least one report of a false-negative case has been published . After all, nerve biopsies are required to obtain an accurate and correct diagnosis of NL. Approximately 83% of nerve biopsies are reported to show lymphomatous infiltration especially in the endoneurium, less commonly in the subperineurium [4–6]. Therefore, suspicion of NL needs a multidisciplinary approach because a biopsy would be performed on the most likely both clinically and radiologically suspected nerve. Consultation with surgeons, who experienced in peripheral nerve procedures including fascicular nerve biopsy, should be recommended .
We herein reported an autopsy case of DLBL strongly associated with pathological findings of NL and IVL in the clinical background of diverse neurological symptoms. Although NL and/or IVL are uncommon features, we pathologists should be aware that, in particular, the NL patients undergo a fatal condition with very poor prognosis, and that the diagnosis of NL requires an accurate and correct approach for an adequate biopsy specimen of the suspected nerves.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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