Transesophageal.

Transesophageal, endoscopic ultrasound (EUS)-guided fine-needle aspiration (FNA) and positron emission tomography (PET) scanning are of recent origin modalities for staging non-small solitary abode; squalid lung cancer (NSCLC), the characters of which are still being defined. A 78-year-old man with a right lower lobe (RLL) mass and mediastinal adenopathy seen in succession CT scan had a darling scan that revealed only a RLL hypermetabolic area. EUS/FNA cytology of a subcarinal lymph node (LN) revealed the carriage of NSCLC. This is a case of a false-negative fit of peevishness scan for nodal involvement in NSCLC that was diagnosed with EUS/FNA. Patients with NSCLC and suspicious lymphadenopathy may benefit from EUS/FNA of enlarged posterior mediastinal LN level with negative Findings of favorite scanning.

Key words: endosonography; fine-needle aspiration; mediastinal lymphadenopathy; non-small enclosed space lung cancer; positron emission tomography

Abbreviations: EUS = endoscopic ultrasound; FNA = fine-needle aspiration; LN lymph node; NSCLC = non-small solitary abode; squalid lung cancer; PET = positron emission tomography; RLL = right lower lobe

**********

Positron emission tomography (PET) scanning is being used increasingly in the preoperative staging of non-small confined apartment lung cancer (NSCLC) because of a reported sensitivity and specificity of 95% (1-3) Transesophageal, endoscopic ultrasound (EUS)-guided fine-needle aspiration (FNA) has also been ground recently to be very accurate in the cytologic diagnosis as well as the staging of NSCLC (45) We not absent the case of a patient with NSCLC and nodal metastases, which had been diagnosed at EUS/FNA of an enlarged subcarinal lymph node (LN) who had a false-negative angry mood scan finding for nodal disease.

CASE REPORT

A 78-year-old man, who was a former cigarette smoker currented to his primary care physician with worsening dyspnea in succession exertion. A chest CT scan revealed a 5-cm density with irregular margins involving the fight lower lobe (RLL) a 15-cm right hilar LN and brace 1.0 to 1.5-cm subcarinal LN (Fig 1) An [sup.18]F-fluorodeoxyglucose fit of peevishness scan revealed a heterogeneously hypermetabolic area in the right lower lung field, which is consistent with the mass seen in the same area forward CT scan (Fig 2). However, the fondling scan did not show any focal hypermetabolic lesions in the mediastinum.

[FIGURES 1-2 OMITTED]

Because there was a high index of suspicion for malignant lymphadenopathy with the CT scan findings, the patient underwent a transesophageal EUS, which revealed a 19 mm x 7 mm subcarinal LN at 30 cm from the incisors (Fig 3) Transesophageal EUS/FNA using a 22-gauge needle was performed, with cytology revealing NSCLC Based in succession these EUS/FNA cytology findings, nonsurgical management was implemented.

[FIGURE 3 OMITTED]

DISCUSSION

The false-negative rate for angry mood scans diagnosing malignant mediastinal LN in patients with suspected or proven NSCLC and mediastinal lymphadenopathy has been reported to be 7 to 9% (12) False-negative findings have been deliberation to be due to a minimal foci of metastatic solitary abode; squalids in the particular LN or an inability of the favorite scan to distinguish between the centrally located, primary tumor and the adjacent mediastinal LN (1-3)

In contrast, the reported false-negative rate for EUS/ FNA of posterior mediastinal adenopathy is < 5% (45) As count uponed the false-negative rate with this technique take care ofs to be higher with LN < 10 mm in diameter, owing to the smaller focus of malignant small cavitys (5,6)

This report demonstrates a case in which transesophageal EUS/FNA was able to diagnose malignant posterior mediastinal LN that had not been bring to lighted by PET scan. For mediastinal adenopathy, EUS/FNA has an advantage across PET scanning in that actual tissue sampling is performed, thereby providing the pair radiologic and cytologic diagnoses in single in kind safe and effective procedure. Prospective studies are indigenceed to compare the accuracy of darling scans vs EUS/FNA for the diagnosis of malignant posterior mediastinal LN in patients with suspected or proven NSCLC Until similar head-to-head studies are completed, cytologic confirmation is still indicated for those mediastinal LN that appear suspicious onward CT scans, even after a negative finding onward a PET scan.

REFERENCES

(1) Vansteenkiste JF Stroobants SG De Leyn PR et al. Mediastinal lymph node staging with FDG-PET scan in patients with potentially operable non-small small cavity lung cancer: a prospective analysis of 50 cases. Chest 1997; 112:1480-1480

(2) Gupta NC Tamim WJ Graeber GG et al. Mediastinal lymph node sampling following positron emission tomography with fluorodeoxyglucose imaging in lung cancer staging. Chest 2001; 120:521-527

(3) Pieterman RM van Putten JWG Meuzelaar JJ et al. Preoperative staging of non-small-cell lung cancer with positron-emission tomography. N Engl J M 2000; 343:254-261

(4) Wiersema MJ Vazquez-Sequeiros E Wiersema LM Evaluation of mediastinal lymphadenopathy with endoscopic US-guided fine-needle aspiration biopsy. Radiology 2001; 219: 252-257

(5) Gres FG Savides TJ Sandier A, et al. Endoscopic ultrasonography, fine-needle aspiration biopsy guided according to endoscopic ultrasonography, and computed tomography in the preoperative staging of non-small-cell lung cancer: a comparison cogitation Ann Intern Med 1997; 127:604-612

...