Extranodal classical Hodgkin lymphoma involving the spinal cord: case report and review of the literature.

Primary CNS involvement is very rare in Hodgkin lymphoma. Here we present two cases of spinal cord dissemination. Two women of 40 and 65 years of age presented symptoms of spinal cord injury; imaging showed an intramedullary mass in T10 and T2, respectively, without vertebral involvement and upper diaphragmatic lymph nodes. Lymph-node biopsy confirmed the diagnosis of classical Hodgkin lymphoma in both patients. The first patient received four cycles of chemotherapy (escalated BEACOPP and ABVD) with intrathecal therapy, and the second four cycles of doxorubicin, vinblastine, dacarbazine (AVD) and local irradiation after surgery decompression. Complete metabolic response was obtained at the end of treatment. After 5 and 7 years of follow-up respectively, neurological deficits persisted in both.

Primary CNS lymphoma accounts for 5% of extranodal lymphomas. Diffuse large B-cell lymphoma is the most common type (90–95% of cases), with a predominance of brain and meningeal presentation [1,2]. Other histological subtypes are Burkitt lymphoma and T-cell lymphoma [1,2]. CNS Hodgkin lymphoma is exceptional, and myelitis is mainly due to secondary effects of radiotherapy and/or chemotherapy [3-5]. Here we describe two cases of extranodal Hodgkin lymphoma with suspended cord involvement (i.e., without contiguous bone involvement), and present a brief review of the literature.

Case reports

First case report

Presentation

A 40-year-old woman, without any personal or family history, presented with cervical lymphadenopathy and lumbar pain in May 2015. She had a grade 1 motor and sensory deficit of the lower limbs with limited vesico-sphincter dysfunctions. She had no fever or night sweats. The spinal MRI revealed a 6 cm spinal cord tumor without vertebral lesion from the T10 to the L1 levels (Figure 1). 18F-fluorodeoxyglucose (FDG) PET imaging showed pathological uptakes in the cervical, axillary and mediastinal lymph nodes and an intramedullary spinal cord signal of 4 cm between the T10 and L1 levels with a 9.82 Standard Uptake Value (SUVmax) (Figure 2). Brain MRI and fundus did not show any other localization.

Figure 1.

Patient 1.

Sagittal T1-weighted MRI showing an intra medullary spinal cord lesion from T10 to L1 levels (arrow).

Figure 2.

Atypical spinal cord lymphoma infiltration.

Transversal and sagittal slides from PET showing intramedullary signal in front of T10 to L1 vertebrae. The arrows show a hypermetabolic lesion located in the spinal cord.

Diagnosis

The cervical lymph-node biopsy confirmed the diagnostic of nodular sclerosing Hodgkin lymphoma. Bone marrow biopsy was negative, and the lactate dehydrogenase levels were normal. Local exploration was limited to the cerebral fluid because of the risk of neurological worsening. An excess of proteins was noted (3.9 g/l) and 670 cells per mm3 were detected. The flow cytometry analysis revealed a T-reactive lymphocyte population and B/T cell clonality tests were negative. PCR for EBV was negative for blood and cerebrospinal fluid.

Treatment

The patient received two cycles of escalated BEACOPP and four cycles of ABVD with four intrathecal injections of cytarabine, Depo-medrol and methotrexate.

Outcome

Complete metabolic response was obtained at the end of treatment and a grade 1 sensitive deficit of the lower limbs persisted at 5 years of follow-up.

Second case report

A 65-year-old woman experienced an acute T2 spinal cord compression in January 2013 with paraplegia and vesico-sphincter dysfunctions. MRI showed a tumor lesion suspended in the spinal cord opposite the T2 vertebra and without contiguous bone involvement (Figure 3). The extension workup did not show any other neurological involvement.

Figure 3.

Patient 2.

Sagittal T1-weighted MRI showing an intramedullary mass regarding T2 vertebrae (arrow).

Spinal decompression surgery was performed and EBV+ classical Hodgkin lymphoma infiltration was diagnosed on biopsies made during surgery; the subtype could not be determined (unclassified form). Right axillary lymph nodes were noted on 18F-FDG PET imaging (4.3 SUVmax), and bone marrow exploration was negative.

The treatment consisted of four cycles of AVD, without bleomycin because of the patient's age, and a 30 Gy vertebral irradiation.

Complete metabolic response was rapidly obtained after two cycles and confirmed after four cycles treatment. The patient is still alive at 7 years from the end of treatment and paraplegia persists as a sequel.

Review of the literature

Spinal cord involvement without bone infiltration is very rare in Hodgkin lymphoma, but 13 case reports were published between 1985 and August 2021 and are summarized in Table 1 [6-18]. These 13 cases were retrieved from PubMed using the following keyword search: (‘myelitis’,‘tumoral myelitis’, ‘neurological localization of Hodgkin lymphoma’, ‘spinal cord infiltration’, ‘primary extranodal Hodgkin lymphoma’). Cases with associated vertebral involvement and not published in English or French were excluded.

Table 1.

Literature review.

Study (year)	Gender	Age (years)	Imaging/level if available	Lymph nodes association	Treatment	Response or survival at the end of treatment	Ref.
Lyding et al. (1987)	Female	32	Intraspinal tumor/C6–C7	Yes	45 Gy of mantle field irradiation/5 cycles of MOPP	CR at the end of treatment	[6]
Higgins et al. (1995)	Male	46	Intraspinal, extradural, extra medullary tumor/ C5–T8	No	Laminectomy, 8 cycles of MOPP-ABV, 30 Gy irradiation	CR at 21 months	[7]
Jardin et al. (1999)	Female	36	Intraspinal tumor/ C8–T1	No	Intrathecal chemotherapy	Death at 2 months	[8]
Riffaud et al. (2003)	Male	14	Lumbar spinal lesion	Yes	Surgery, 6 cycles of AVD like chemotherapy/21 Gy of mantle field irradiation	CR at 1 year of the end of treatment	[9]
Heran et al. (2006)	Male	42	Lower cervical spinal mass	No	Surgical biopsy, ABVD (number of cycles not provided)	CR at the end of treatment	[10]
Kilani et al. (2006)	Male	32	Transverse myelitis T6–T7	Yes	None	Early death	[11]
Al Khayat et al. (2007)	Female	42	Para spinal mass/C7–T1	No	Cervical surgical biopsy, 4 cycles of ABVD and 30 Gy irradiation	CR at 12 months	[12]
Samadian et al. (2009)	Male	12	Epidural mass/L1–L3	No	Laminectomy, 6 cycles ABVD, 24 Gy irradiation	CR and alive at 7 years	[13]
Chotai et al. (2010)	Male	24	Caudal mass/L5–S3	No	Laminectomy/3 cycles of ABVD (treatment interrupted by the patient)	PR at 12 months	[14]
Yaman et al. (2013)	Male	30	Epidural tumor/T9–T11	No	Laminectomy, 6 cycles of ABVD	CR at 24 months	[15]
Martinez et al. (2014)	Female	74	Lumbar intramedullary 1.4 cm mass and an enhancing lesion at the pontomedullary junction and involving the left middle and inferior cerebellar peduncle	No	Lumbar surgical biopsy, cerebral and lumbar 36 Gy irradiation	CR at 6 months	[16]
Williamson et al. (2020)	Female	48	Two spinal lesions regarding L1–L2 and L5–S1	No	Laminectomy, 36 Gy irradiation	CR at 10 months	[17]
Bloxham et al. (2021)	Female	15	Epidural mass regarding L3, L4 and L5	Yes	Surgical decompression/2 cycles of OEPA, 4 cycles of COPDAC and irradiation (dose not provided)	PR before irradiation	[18]

ABVD: Doxorubicin, bleomycin, vinblastine, dacabazine; COPDAC: Cyclophosphamide, vincristine, prednisone, dacarbazine; CR: Complete response; MOPP: Mechloretamine, vincristine, procarbazine, prednisone; OEPA: Vincristine, etoposide, prednisone, doxorubicin; PR: Partial response.

The spinal involvement was isolated (= without lymph-node infiltration) in nine out of 13 cases. A total of 11 patients had a single spinal cord lesion and two had two locations (cerebral localization for the first and a second spinal cord compression level for the second) [16,17]. The median age of the patients was 32 (12–74) years and the sex ratio H/F was 1.1. The level of the spinal lesions varied from patient to patient as follows: two patients had a cervical spinal lesion, four a cervicodorsal lesion, one a dorsal lesion, four a lumbar lesion and two a lumbosacral lesion. All patients had various symptoms, including paresthesia, low back pain, motor or sensory deficits, vesico-sphincter dysfunctions and dizziness. The median time between neurological symptoms and Hodgkin lymphoma diagnosis was 1.5 (1–5) months. Just one patient presented myelitis 13 years after the diagnosis of Hodgkin lymphoma [8].

The diagnosis was confirmed by lymph-node biopsy, exploration of cerebral fluid, or spinal cord biopsy when it was possible and safe; spinal cord biopsy was performed in 11 cases, with confirmation of Hodgkin lymphoma diagnosis in nine patients and a lumbar punction suggested in the two last patients (Hodgkin lymphoma infiltration in one) [6,8], and lymph-node biopsy was performed in two patients after non contributory lumbar punction and spinal cord biopsy [6,18]. The nodular sclerosis form was the most represented subtype (6/13), the mixed cellularity and lymphocyte predominant subtypes were documented in only two patients [13,15], and in four patients the histologic subtype was not specified [8,10,11,14]. Surgery was first performed in ten patients as follows: six for a spinal cord decompression [8,9,14,15,18] and four for diagnosis (biopsy only) [10,12,16,17]. After surgery, five patients received a combination of chemotherapy and radiotherapy [7,9,12,13,18], three only chemotherapy [10,14,15] and two only radiotherapy [16,17]. Three patients were not operated; one patient received chemotherapy and radiotherapy [6], one patient only intrathecal chemotherapy [8] and the last received no treatment [11]. Explorations of cerebral fluid were performed during the surgery in two patients, without identification of Hodgkin lymphoma cells [13,16].

ABVD or ABVD-like was the most used regimen (7/13), with a median cycle number of 6 per patient (3–8). The median intensity dose of radiotherapy was 30 Gy (21–45), and only one patient received more than 36 Gy (patient treated in 1987) [6]. The response rate was evaluable in 11 patients as follows: spinal MRI was performed in seven patients [6,7,9,13,15-18], a combined body scan in one patient [7] and 18F-fluorodeoxyglucose (FDG) PET in one patient [15] and only a 18F-FDG PET in one patient [18]. The type of evaluation was not specified for three patients [10,12,14], and two patients died early from their lymphoma [8,11]. Complete response was obtained in the majority of the patients (9/11), and partial response in one patient [18]. Concerning neurological symptoms, complete resolution was achieved in one patient [17], hypoesthesia or mild lower extremity weakness persisted after treatment in four patients [7,9,12,16], one patient presented a vincristine-related peripheral neuropathy [6], two died early [8,11], and this information was not specified for five patients [10,13-15,18].

Discussion & conclusion

Primary spinal cord involvement is exceptional in lymphoma and occurs in less than 1% of all CNS sites of disease [19]. Diffuse large B-cell lymphoma is the most common histological type, but several cases of neurological Hodgkin lymphoma have already been described. Standards of care are well established for CNS diffuse large B-cell lymphoma, but not for Hodgkin disease [20]. Considering its high sensitivity to detect extranodal involvement, 18F-fluorodeoxyglucose PET is sufficient to detect early neurological infiltration and MRI to evaluate column involvement. The blood–brain barrier (BBB) protects the brain from pathogen invasion or inflammation and is composed of endothelial cells, astrocytes and pericytes, with close contact with the brain microenvironment (microglia) [21]. The BBB has long been considered an immunological sanctuary, but it is a permeable and dynamic barrier that allows constant communication between the blood and the brain. Disruption of this barrier can occur in several circumstances, such as stroke disease, tumor, Alzheimer’s disease, Parkinson’s disease, infection [21]. In the case of solid tumors, the metastatic cells migrate to the brain by hematogenous route in the cerebral capillaries, and then infiltrate the cerebral parenchyma by extravasation (melanoma, breast, lung and kidney cancer) [21,22]. In lymphomas, dissemination occurs mainly through the lymphatic system, but recent studies have shown the presence of circulating tumor DNA, which may explain diffuse extranodal localizations [23].

In the case of Hodgkin lymphoma, Reed–Sternberg cells are rarely detected in the cerebrospinal fluid, and thus lumbar punction may not be indicated in these cases and a non specific excess of protein is often documented [6,13,16]. Histologic documentation with a surgical biopsy, is highly recommended if the neurological lesion is unique and symptomatic. Laminectomy is often performed to establish the diagnosis and decompress the spinal cord at the same time. Recent work has been reported on the feasibility of detecting circulating tumor DNA from cerebrospinal fluid, which could avoid high-risk surgery [24].

Extranodal Hodgkin lymphoma is considered as stage IV disease or advanced-stage with a higher risk of relapse than early-stage [25]. ABVD and escalated BEACOPP are the two main chemotherapy regimens (6–8 cycles), and early evaluation by PET is recommended after two cycles of induction to adapt the end of treatment and to minimize toxicity (escalating strategy with BEACOPP if PET is positive after two cycles of ABVD or deescalating strategy with ABVD if PET is negative after BEACOPP) [25-28]. The 5-year progression free survival varies from 74 to 95% [22-24]. The addition of the anti-CD30 immunoconjugate brentuximab vedotin to AVD (bleomycin not permitted because of pulmonary fibrosis risk) is feasible and safe with a 2-year progression free survival of 81% [28]. There is no standard of care for neurological localization. Methotrexate and cytarabine are the two main drugs able to cross the BBB. There are few methotrexate-based treatment regimens for Hodgkin lymphoma and cytarabine is more often offered to relapsed patients [29-31].

In the review of the literature, patients were treated with a standard regimen (ABVD or ABVD-like regimen) with a high level of complete response (9/13). The BBB is probably altered in these patients, allowing the diffusion of usual drugs [30]. The use of radiotherapy in addition to surgery to increase local control, is also questionable. A 30–36 Gy radiotherapy is usually proposed to patients with residual lesions or initial bulky disease in nodal and extranodal Hodgkin lymphoma [32]. For patients with neurological localization, management must be multidisciplinary. Several molecules are known to cross the BBB such as temozolomide, carmustine, lomustine, cisplatin, ifosfamide, etoposide, procarbazine, vincristine, irinotecan, cyclophosphamide and doxorubicin at low concentration [33]. Conventional chemotherapy regimens seem to be effective; the BEACOPP regimen would include more molecules crossing the barrier than the ABVD. Intrathecal chemotherapy injections are not clearly recommended. Surgery should be reserved for patients with severe spinal cord compression and/or for diagnosis if there is no other tumoral target. Radiotherapy could be proposed to patients in partial remission after chemotherapy and preservation of neurological functions should be a priority. 3D neuroimaging is the first step to define the tumor and clinical target volume, and combination of pretherapeutic MRI and PET is very useful to determine the therapeutic irradiation field. These patients could also benefit from advanced radiotherapy technology (stereotactic body radiotherapy), and the maximum delivered dose would be discussed with radiotherapists [32,34]. Despite a good disease control, most of patients present with long-term neurological symptoms (e.g., dysesthesia, sensory and/or motor deficits, chronic pain and dizziness). Personalized rehabilitation programs should be offered to each patient during and after the conventional treatment.

Spinal cord infiltration is rare in Hodgkin lymphoma and symptoms often precede diagnosis by a few weeks.

Liquid biopsy could be a diagnostic help for non-operable patients and a new biomarker.

Surgery and irradiation could provide a good local control in addition to chemotherapy.

BEACOPP regimen seems to be the best choice, regarding the number of molecules crossing the blood–brain barrier. Radiotherapy can increase local control in case of incomplete response.

Management should be multidisciplinary.

Prognosis remains good if the treatment is administered early.