A false positive for metastatic lymph nodes in the axillary region of a breast cancer patient following mastectomy.
ABSTRACT Recent advanced imaging modalities such as positron emission tomography (PET) detect malignancies using 2-[18F]-fluoro-2-deoxy-D: -glucose (18-FDG) with high accuracy, and they contribute to decisions regarding diagnosis, staging, recurrence, and treatment response. Here, we report a case of false-positive metastatic lymph nodes that were diagnosed by PET/CT and ultrasonography in a 48-year-old breast cancer patient who had undergone mastectomy. The tumors, which were oval shaped and resembled lymph nodes, were detected by ultrasonography. PET/CT revealed high uptake of 18-FDG in the tumors. To investigate the proposed recurrence and to re-evaluate the biology of the recurrent tumors, a tumor was removed from the brachial plexus of the patient. Histological findings revealed it to be a schwannoma. All imaging modalities including PET/CT failed to distinguish benign tumors from metastatic lymph nodes in the brachial plexus. After resection of the schwannomas, the patient complained of a slight motor disorder of the second finger on the right hand. Hence, it is important to consider a false-positive case of lymph node metastasis in a breast cancer patient following mastectomy.
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ABSTRACT: Background: The association of PET/CT and tumor markers can be considered complementary, since any significant increases of tumor markers can indicate the presence of disease while PET/CT is able to detect and describe the tumor sites. In this retrospective, single-institution study, we determine the correlation between cancer antigen (CA) 15.3 value and qualitative and semi-quantitative PET/CT data in breast cancer (BC) patients. Methods: 193 BC patients (median age 61 yrs) already treated with primary treatment (surgery and others) were identified through institutional databases. All patients underwent PET/CT for increase in tumor markers, post-therapy evaluation, restaging and doubtful conventional imaging for disease relapse. The CA15.3 values before PET/CT scan were collected for all patients. Clinical outcome was defined as presence or absence of disease recurrence based on follow-up data (histological or imaging findings). CA15.3 quartile values and qualitative and semi-quantitative (maximum Standardized Uptake Value – SUVmax) PET/CT findings were compared with chi-square test and linear regression analysis. Results: The mean value of CA15.3 was significantly higher in patients with positive than negative PET/CT (67.51±120.92 vs. 25.54±17.54, p45 UI/ml) and FDG PET/CT determined high sensitivity and accuracy (92% and 82%, respectively) but a low specificity (50%) for restaging BC patients. The highest specificity (~ 70%) was found when PET/CT and 2nd quartile of CA15.3 (value: 12.95-25) were associated. No correlation between CA15.3 values and SUVmax was found (p=0.489); whereas a trend in increase of the CA15.3 value and SUVmax in the presence of visceral and no-visceral site of disease (22.4±16.2, 64.9±108 and 6.4±4.2, 8.2±5.1, respectively) was identified. Conclusions: The value of CA15.3 and PET/CT findings are consistently complementary. About 25% of BC patients with a negative CA15.3 value had a positive PET/CT and disease relapse. SUVmax and CA15.3 values are not correlated.Current Radiopharmaceuticals 08/2014; 7(1).
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ABSTRACT: Schwannoma is a tumor that develops on peripheral nerves or spinal roots. Although any part of the body can be affected, axillar and supraclavicular lesions are unusual for schwannoma. We report two cases of schwannoma arising in the brachial plexus, which were detected by 18 F-fluorodeoxyglucose positron emission tomography and computed tomography (FDG-PET/CT).Case 1: A 75-year-old Japanese woman showed high FDG accumulation in a subclavicular or axillary lesion found by FDG-PET/CT. Axillar-subclavicular lymph node metastasis was suspected and surgical excision was performed. Histological evaluation revealed schwannoma.Case 2: A 75-year-old Japanese woman was diagnosed with suspected primary lung cancer with brain metastases. She showed high FDG uptake at a subclavicular or axillary lesion found by FDG-PET/CT. Surgical excision was performed to arrive at a definitive diagnosis. The mass was located at the trunk of the brachial plexus and was identified as a schwannoma.World Journal of Surgical Oncology 10/2014; 12(1):309. · 1.09 Impact Factor
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ABSTRACT: Breast cancer is the most frequently diagnosed cancer among females. It is accepted that lymph node involvement with metastatic tumor and the presence of distant metastasis are the most important prognostic factors. Accurate staging is important in determining prognosis and appropriate treatment. Positron emission tomography with computed tomography detects malignancies using 2-[18F]-fluoro-2-deoxy-d-glucose (18F-FDG PET CT) with high accuracy and they contribute to decisions regarding diagnosis, staging, recurrence, and treatment response. Here, we report a case of false positive metastatic mediastinal lymph nodes that were diagnosed by 18F-FDG PET CT in a 40-year-old breast cancer patient who had undergone preoperative evaluation. Right paratracheal, prevascular, aorticopulmonary, precarinal, subcarinal, hilar, and subhilar multiple conglomerated mediastinal lymph nodes were revealed in addition to left breast mass and axillary lymph nodes. Mediastinoscopy was performed with biopsy and pathology was reported as granulomatous lymphadenitis. In conclusion, any abnormal FDG accumulation in unusual lymph nodes must be evaluated carefully and confirmed histopathologically.Case Reports in Medicine 01/2013; 2013:459753.