Screening recurrence and lymph node metastases in head and neck cancer: the role of computer tomography in follow-up
© Rivelli et al; licensee BioMed Central Ltd. 2011
Received: 22 December 2010
Accepted: 25 March 2011
Published: 25 March 2011
Follow-up of patients with oral cancer is being questioned with regard to financial costs and effectiveness. Therefore, the aim of the present study was to evaluate whether local recurrence and cervical lymph node metastases were first discovered clinically or by routine computer tomography.
Materials and methods
The records of all 317 patients that were treated for an oral cancer between 1998 and 2008 were systematically reviewed. Criteria for inclusion were tumor histology with a squamous cell carcinoma of the head and neck, and regular follow-up examinations with a minimum follow-up time of 12 months, including clinical and radiological (CT) controls. All patients had the first CT after 6 months, followed by yearly CT controls.
Out of 315 patients with an oral squamous cell carcinoma, 294 were evaluated. Those experiencing neither recurrence of the tumor nor lymph node metastases constituted 62%. Local recurrence was seen in 36 (12%), lymph node metastases in 32 (11%), and both in 16 (6%). Of the 32 patients with lymph node metastases, 25 were recognized first clinically, and 7 were detected by routine CT scans; concerning local recurrence, 32 appeared clinically, and 4 were detected by routine CT scans.
Routine CT for follow-up is still indicated for detecting lymph node metastases as well as local recurrence.
The 5-year disease-specific survival rate for patients with primary oral cancer ranges from 53%  to 74% . Most of the locoregional recurrences and lymph node metastases in head and neck cancer occur within the first two years [3, 4]. The status of the lymph nodes appears to be one of the most important prognostic factors for patients with squamous cell carcinoma (SCC) of the head and neck, and recurrent disease seems to be associated with decreased survival . Examination of the neck is based mainly on palpation.
Follow-up, including CT scans, of patients with oral cancer is being questioned with regard to financial costs and effectiveness. Most of the studies dealing with detection of cervical lymph node metastases are preoperative assessments. In surgically treated or radiated necks, the assessment seems to be more difficult due to scar tissue. Therefore, the aim of the present study was to evaluate whether local recurrence and cervical lymph node metastases were first discovered clinically or by routine computer tomography.
Materials and methods
after 6 and 12 months
every 2 months control
once a year
every 3 months control
once a year
every 6 months control
once a year
From year 5
once a year control
only in suspicious cases
Data of recurrence and LN metastasis (Missing = Patients without local recurrence or LN metastasis during follow-up)
Time of recurrence
Time of LN metastases
Time of recurrence and LN metastases
Palpation alone for assessment of cervical lymph node metastases seems to be unreliable . For staging, ultrasonography, computed tomography, and magnetic resonance imaging (MRI) are generally considered superior to palpation . Concerning the comparison between palpation, CT, and low field MRI, Atula et al. were able to show, in 86 patients without palpable normal necks, that CT (23 positive) was superior to low field MRI (10 positive) and ultrasonography (12 positive) . Yousem et al. arrived at similar results by studying central nodal necrosis and extracapsular spread, experiencing a more accurate detection by CT in comparison to unenhanced or enhanced MRI . In one of the largest meta-analyses, de Bondt et al. showed that ultrasonography-guided fine needle aspiration cytology had the highest diagnostic odds ratio (DOR = 260), compared to ultrasonography (DOR = 40), CT (DOR = 14), and MRI (DOR = 7) .
Nowadays, FDG-PET seems to play a more and more intensive role in lymph node metastasis or second tumor assessment. Recently Yamazaki et al. studied 1076 lymph nodes with preoperative FDG-PET and CT. FDG-PET detected 100% of metastatic lymph nodes ≥ 10 mm and intranodal tumor deposits ≥ 9 mm, and had fewer false-positives than did CT .
Several CT criteria for assessing nodal metastases have been discussed, like nodal size criteria (greatest diameter more than 1.5 cm for jugolodigastric and submandibular nodes, more than 1 cm for all other lymph nodes) nodal shape (more spherical shape in metastastic nodes), nodal grouping (three or more, each with a diameter of 8-15 mm), and central necrosis . But in postoperative or radiated necks, the evaluation appears to be more difficult that in the preoperative status.
More than two-thirds of locoregional recurrences and lymph node metastases occur within the first two years [14, 15]. In the present study, local recurrence (Figure 3) appeared later in comparison to lymph node metastases (Figure 4).
The present study demonstrates that a reduction in the follow-up period of 5 years is not acceptable, in particular with regard to local recurrences. CT is still indicated for follow-up controls besides the clinical controls, but the alternative of ultrasonography, in particular for neck evaluation, should be taken into further consideration.
Routine CT for follow-up is still indicated for detecting lymph node metastases as well as local recurrence. Ultrasonography does have a growing importance for detection of lymph node metastasis but not for local recurrences. Thorough clinical investigation is of course the baseline diagnostic.
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