The coexistence of tuberculous lymphadenitis of the neck region and head and neck cancer is extremely rare. In this clinical situation, the use of positron emission and computed tomography using fluorine-18 fluorodeoxyglucose (18F-FDG PET/CT) may facilitate the differentiation between malignancy and tuberculosis.
We present a case of an Eastern European man with nasopharyngeal cancer and concurrent tuberculous lymphadenitis.
The adequate and critical interpretation of pretreatment 18F-FDG PET/CT scan addressed the multidisciplinary team to the proper staging of disease and to the correct therapeutic approach.
Tumori 2016; 102(Suppl. 2): e22 - e25
Article Type: CASE REPORT
AuthorsRenato Micera, Nicola Simoni, Mario De Liguoro, Federica Vigo, Claudia Grondelli, Marco Galaverni, Massimo Roncali, Maria Pagano, Cinzia Iotti
- • Accepted on 17/08/2015
- • Available online on 26/09/2015
- • Published online on 11/11/2016
This article is available as full text PDF.
In Italy, as in many Western European countries, tuberculosis (TB) is a relatively rare disease, with a prevalence of 6.7 cases/100,000 inhabitants in 2013. However, in some parts of Eastern Europe, the incidence of TB continues to be high (1).
Lymphadenitis is the most commonly occurring form of extrapulmonary TB. Cervical lymph node involvement is the most frequently observed, but inguinal, axillary, mesenteric, mediastinal, and intramammary adenopathies have also been described (2).
Nasopharyngeal cancer (NPC) is rare in Europe, with an annual crude incidence rate of 1.1 per 100,000 (3).
In most cases, cervical lymph node involvement is the main symptom of NPC. Up to 75% of patients show enlarged cervical nodes at presentation and bilateral lymphadenopathy may be seen in 80% of patients. Although the retropharyngeal lymph nodes are considered the first echelon nodes, 35% of metastasis bypass them to directly reach the internal jugular nodes (level II).
Falagas et al (4) described 3 different types of association between malignancy and TB: 1) the development of cancer on the background of a previous tuberculous infection; 2) the concurrent existence of TB and malignancy in the same patient or clinical specimen; and 3) the diagnostic challenges arising from the multifaceted presentations of these 2 disorders.
In the staging workup of NPC, positron emission and computed tomography using fluorine-18 fluorodeoxyglucose (18F-FDG PET/CT) has excellent diagnostic performance for detecting lymph nodal and distant metastases (5). 18F-FDG PET/CT may facilitate the identification of extrapulmonary TB, the staging of TB, and the differentiation between malignancies and TB (6).
In this article, we report the key role of 18F-FDG PET/CT for correct diagnosis, staging, and treatment in a man with simultaneous NPC and TB lymphadenitis.
A 36-year-old Romanian man was admitted to our hospital for persistent headaches. No other symptoms were present. Magnetic resonance imaging of the brain revealed a lesion of the right wall of the nasopharynx with infiltration of the parapharyngeal space. Biopsy documented an undifferentiated carcinoma. At clinical examination, no cervical palpable lymph nodes were present. Contrast-enhanced computed tomography (CECT) of head and neck and thorax confirmed the nasopharyngeal lesion and showed multiple bilateral nodes (right levels II, III and left levels II-IV) with characteristics suspicious for metastases. Hence, the disease was staged cT2N2M0 according to
In our patient, in addition to the primary lesion, 2 bilateral nodes of level II, 1 left level IV node, and multiple right axillary nodes were FDG avid (mean SUVmax 5.1, range 6.9-3.5). The maximum activity was observed in the primary lesion (SUVmax 6.8) and in the left level II node (SUVmax 6.9). The SUVmax of the axillary node was 4.8 (
Pre treatment 18 F-FDG PET/CT.
The NPC was downstaged to cT2N0M0. With the definitive radiotherapy treatment, only the primary lesion received the highest dose, whereas levels II, III, Va, and VII received 59.4 Gy (dose adequate to control a microscopic disease) and levels IV and Vb 54 Gy (
Orthogonal views of dose distribution.
Despite the short period, at 1 year since the end of the radiotherapy, there was no clinical or radiologic evidence of NPC or TB (
Post treatment 18 F-FDG PET/CT.
There is a well-known association between TB and malignancy, such as the development of cancer on the background of a previous TB infection or as the concurrent existence of TB and malignancy (5). Lymphadenitis of the head and neck region is the most commonly occurring form of extrapulmonary TB, hence the coexistence with head and neck cancer poses a diagnostic dilemma. Proper assessment of the disease is important when deciding on the correct treatment regimen.
We present a case of an Eastern European man with NPC and concurrent extrapulmonary TB. To our knowledge, this is the first case of coexisting NPC and TB cervical lymphadenitis in the English literature.
Falagas et al (4) reported 47 cases, 1 case series, and 2 retrospective studies that focused on the coexistence of malignant tumors with TB infection in the same site. Only one case in which a tongue cancer occurred synchronously with cervical TB lymphadenitis was described (5, 8). Two other articles reported coexisting tuberculous lymphadenitis with head and neck malignancy, one with a soft palate cancer (9) and the other with a larynx cancer (10).
18F-FDG PET/CT has a growing role in the diagnosis and management of NPC, both for staging purposes and for improving the accuracy of gross tumor volume delineation. In extrapulmonary TB, PET/CT can help in demonstrating lesion extent, detecting additional lesions missed on morphologic imaging, and in serving as a guide for biopsy with aspiration for culture (6). With the use of SUV, it is impossible to distinguish tuberculous lymphadenitis from metastatic lymph node involvement; however, certain patterns of lymph node tracer distribution provide useful clues helping the diagnosis. In our case, the doubt of coexisting infection resulted only from the distribution of the nodal uptake (right axillary region), extremely unusual for NPC. Therefore the use of a total body examination such as PET/CT directed the multidisciplinary team towards the correct diagnosis and subsequent treatment strategy. The change in the radiation treatment induced a reduction of high-dose and high-risk volumes, resulting in a lower risk of acute and late toxicity, particularly of parotid and submandibular glands. Concomitant systemic therapy, which could have worsened the risk of tuberculous infection, was not administered. However, it is necessary to underline that in absence of atypical lymph nodal location in the axillary region, PET-CT could have led us to consider all the suspected and border line nodes metastatic, and therefore no other investigations would have been planned.
In conclusion, this case highlights the importance of adequate and critical interpretation of 18F-FDG PET/CT, because an incorrect diagnosis can be detrimental for patients with cancer and coexistent TB, especially for
- Micera, Renato [PubMed] [Google Scholar] 1, * Corresponding Author (email@example.com)
- Simoni, Nicola [PubMed] [Google Scholar] 1
- Liguoro, Mario De [PubMed] [Google Scholar] 1
- Vigo, Federica [PubMed] [Google Scholar] 1
- Grondelli, Claudia [PubMed] [Google Scholar] 1
- Galaverni, Marco [PubMed] [Google Scholar] 1
- Roncali, Massimo [PubMed] [Google Scholar] 2
- Pagano, Maria [PubMed] [Google Scholar] 3
- Iotti, Cinzia [PubMed] [Google Scholar] 1
Radiation Therapy Unit, Department of Oncology and Advanced Technology, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia - Italy
Nuclear Medicine Unit, Department of Oncology and Advanced Technology, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia - Italy
Medical Oncology Unit, Department of Oncology and Advanced Technology, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia - Italy