Early cytological diagnosis of extranodal stage I, primary thyroid Non-Hodgkin lymphoma in elderly patients. Report of two cases and review of the literature
© Vigliar et al; licensee BioMed Central Ltd. 2013
Published: 8 October 2013
Primary thyroid lymphomas (PTLs) account for 5% of thyroid malignant tumors and often develop in patients with Hashimoto Thyroiditis (HT). Fine-needle cytology (FNC) is widely used in the diagnosis of thyroid nodules, including those arising in HT. Two PTL cases in HT elderly patients are here described and discussed.
FNC was performed in rapidly enlarged thyroid nodules of 2 elderly patients under ultrasound (US) control. FNC was used to prepare conventional cytologic smears, immunocytochemistry (ICC) and flow cytometry (FC) assessment of cell populations.
The above cases were diagnosed as well differentiated, small B-cell and diffuse large B-cell thyroid lymphomas, respectively, by means of FNC. The histological diagnoses were mucosa-associated non Hodgkin lymphoma (MALT) and diffuse large B-cell lymphoma (DLBCL), confirming FNC diagnoses, and patients were treated accordingly.
FNC diagnosis of PTL is reliable and accurate; it may be conveniently used in the clinical practice since it provides indications for appropriate therapeutic procedures or diagnostic surgery, and avoids to treat benign nodules.
Primary thyroid lymphomas (PTLs) are a rare group of diseases that accounts for 5% of all thyroid malignant tumors, and approximately for 1/2% of all extra nodal lymphomas. Most PTLs are B- and T-cell non-Hodgkin lymphomas (NHLs), whereas primary thyroid Hodgkin lymphoma (HL) has been occasionally reported . An high percentage of PTLs affects patients suffering from long standing Hashimoto Thyroiditis (HT), therefore PTL pathogenesis is probably related to chronic inflammation stimulation . Although HT mainly affects women and adult patients, men and younger patients may also be affected [2–4]. PTL clinical signs include a rapidly enlarging mass in the thyroid area, variable hoarseness and dyspnea. NHL symptoms, such as weight loss, fever and nocturnal sweats, may also be present, although less frequently. Most PTLs are B-cell NHL, being mucosa-associated-lymphoid tissue (MALT) lymphoma and diffuse large B-cell lymphoma (DLBCL) the most frequently reported histotypes . Treatment and prognosis depend on the specific subtype and staging; surgical treatment of localized tumors, radio and chemotherapy for low-grade and high-grade histotypes respectively is generally utilized . A 5-year survival of 90% has been reported in correctly diagnosed and treated PTL patients ; therefore a timely and accurate diagnosis of PTL is mandatory for treatment and prognosis. Palpable neck masses are not a rare occurrence, some time representing a challenging diagnostic dilemma with unusual extrathyroidal masses [8, 9]. Serological or cellular biomarkers would be of great diagnostic utility to distinguish benign from malignant thyroid nodules . For instance, an increase in circulating levels of pro-angiogenic cytokines, as well as of bone marrow-derived endothelial progenitor cells (EPCs), has been observed in tumor patients [11–14]. Unfortunately, calcitonin is the only available biomarker to this purpose, and its utility is limited to the diagnosis of medullary thyroid carcinoma. Both molecular and functional studies have revealed that neoplastic cells remodel their Ca2+ signaling machinery [11, 15–18], thereby leading the notion that up-regulated plasmalemmal Ca2+-permeable channels might serve as alternative diagnostic markers of neoplastic transformation . Unfortunately, these studies are yet to be performed in PTL. Fine-needle cytology (FNC) is the primary diagnostic tool [19–24] for all other nodular thyroid diseases. Inconclusive results are frequent and the application of molecular techniques to FNC has dramatically increased its sensitivity [24–32], including in HT cases with diffuse or nodular enlargement . These advantages are enhanced in case of HT, which does not require surgical treatment, and even more in elderly patients, for whom surgery is generally more burdensome, complex and expensive than younger patients . The aim of this study is to present 2 cases of PTL in elderly patients in which FNC pre-surgical diagnosis has contributed to a correct and differentiated treatment.
Materials and methods
Between January 2010 and December 2012, 1.256 patients with thyroid nodules or diffuse swelling underwent FNC in the outpatient clinics of the Azienda Ospedaliera Universitaria, University of Salerno. Two of these patients were diagnosed with PTL; the first patient was a 66-year-old man who suffered from long standing HT. The gland had progressively enlarged in the last months causing dyspnea and difficulty in swallowing. The second was a 68-year-old woman with an undefined history of long standing goiter, who complained dyspnea, voice change and choking. Both patients underwent ultrasound (US)-guided FNC with rapid on-site evaluation (ROSE), as previously described [34–36]. The diagnostic procedure and its related risks were first discussed with the patients, who were also informed that 1 or 2 supplementary passes might have been needed, and an informed consent was obtained. Additional passes were used to prepare additional smears for immunocytochemistry (ICC) and cell suspensions in buffer solution to perform flow cytometry (FC) assessment of the cell populations. Monoclonal antibodies used for ICC were directed against thyroglobulin (TG), leucocyte common antigen (LCA), cytokeratin (CK), CD20, CD3, CD4, CD8, CD5, CD10, CD19, kappa and lambda light chains. Fluoresceinated antibodies for FC were: basic combinations of phycoerythrin (PE), perdin chlorophyll protein (PERCP) and fluorescein isothiocyanate (FITC) antibodies. Antibodies were purchased from Becton Dickinson (San José, CA). Antibodies clones, dilutions and technical details for both procedures were previously described [37, 38]. In particular, FC data were interpreted accordingly in this specific clinical and anatomical setting [32, 39]; with regard to the light chain evaluation for clonal assessment of the lymphoid cell populations, a percentage of the gated cells showing κ/λ unbalance ≤ 20% of the gated cells was considered evidence of clonality . FC and ICC assessments were used to perform the final diagnoses and were included in the cytological reports.
Primary thyroid lymphoma (PTL) is a lymphomatous process which develops in the thyroid without involvement of primary lymphoid organs or distant metastases at diagnosis . As reported above, PTL mostly arises in the setting of autoimmune thyroiditis and takes an average of 20 to 30 years to develop after the onset of lymphocytic thyroiditis . PTL frequently presents in IE/IIE clinical stages, with some clinical and imaging problems. A short history of a rapidly enlarging neck mass, often associated with dyspnea, difficulty in swallowing, or voice change, is the hallmark presentation of thyroid lymphoma . These signs, as well as imaging procedures, may overlap with those of other benign and malignant thyroid pathologies and require an accurate pre-surgical diagnosis. FNC is the most frequently used procedure for the initial pathological diagnosis of thyroid nodules . Conventional examination of cytologic smears yields inconclusive results that can be refined by testing for specific genetic alterations [26, 27, 44, 45]. FNC has the highest levels of sensitivity and specificity , but studies have shown inconsistent results in the diagnosis of PTL. A correct diagnosis of PTL with FNC was made in 70/80% of cases , whereas other studies report that FNC was suggestive but not diagnostic in only 50/60% of cases [47, 48]. The 2 study cases were both correctly diagnosed and are an example of the 2 main occurring histotypes, the cytological diagnostic difficulties and the importance of ancillary techniques applied to FNC. As reported above, in the first case the main differential diagnosis of HT with severe lymphoid infiltrate was pointed out. Indeed, the US presentation of HT is quite variable, ranging from normal thyroid parenchyma imaging to diffuse homogeneus enlargement or atrophy, up to uninodular or multinodular presentation in +/-50% of cases [49, 50]. The US appearance of the nodules is also extremely variable; nodules may be hypo or hyper echoic, can have calcifications (micro and scattered, macro or eggshell calcifications), and may also show a hypoechoic halo. The cytological presentation showed the prevalence of lymphoid cells, which gave smears a lymph node-like appearance, including the prevalence of immature follicular centre cells. Finally, the possible presence of small clones of B cells with light chain restriction has been reported in HT, adding further diagnostic difficulties. On the other side, the monotonous cytological smear of immature lymphoid cells, the lack of thyroid follicular cells and the presence of large chain restrictions in most FC assessments of T gated cells strongly supported the diagnosis of PTL. In the second case, other diagnostic difficulties were encountered; in fact, clinical presentation and cytological features clearly indicated a malignant tumor, but a differential diagnosis of possible anaplastic carcinoma was pointed out. However, in this case FC did not show light chain expression, as it can occur in high grade B-cell NHL. Nonetheless, ICC and FC clearly indicated the lymphoid B-cell origin of the neoplastic cell. Therefore properly used ancillary techniques, together with clinical and imaging data and cytological features, allowed the diagnosis of PTL. This possibility enhances the cytological diagnosis not only in PTL cases, but also in the benign hyperplastic and nodular presentation of HT, in which surgery should not be considered neither for diagnostic or therapeutic purposes. PTL treatment is similar to other nodal NHLs. In case of intermediate or high-grade lymphoma, the best results are obtained with cyclophosphamide, doxorubicin, vincristine and prednisolone (CHOP) based chemotherapy. Radiotherapy is generally used after 3-6 CHOP courses in the form of modified mantle irradiation, including thyroid, bilateral neck, supraclavicular area and mediastinum . Unfavorable prognostic factors include age (> 60 years), elevated levels of serum lactate dehydrogenase (LDH) and β2 microglobulin, extranodal sites involvement and III-IV stage . Our patients received CHOP-based chemotherapy and radiotherapy; both are alive with (case 2) and without (case 1) signs of disease. In conclusion, the cytological diagnosis of PTL is reliable and accurate; it may be conveniently used in the clinical setting since it provides indications for diagnostic surgery, when needed, and avoids to treat HT cases.
Funding for this supplement came from personal funds.
This article has been published as part of BMC Surgery Volume 13 Supplement 2, 2013: Proceedings from the 26th National Congress of the Italian Society of Geriatric Surgery. The full contents of the supplement are available online at http://www.biomedcentral.com/bmcsurg/supplements/13/S2
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