eMedicine Specialties > Pulmonology > Lung Tumors
Solitary Pulmonary Nodule: Treatment & Medication
Updated: Sep 11, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Treatment
Medical Care
Lesions that have typical benign features, such as lack of change over 2 years or a benign pattern of calcification, especially in low-risk patients, do not require further workup. On the other hand, lesions that are strongly suggestive of malignancy (eg, >3 cm diameter) or those with documented growth should be referred for surgical resection.15 Management decisions for lesions with intermediate probability (which are most lesions) are more complex. Although management varies amongst individual institutions and practitioners, several guidelines have been published.
In 2005, the Fleischner Society published guidelines16 for follow-up imaging of solitary pulmonary nodules (SPNs). They specified different strategies based on patient risk factors and the size of the nodule
- Low-risk patients
- Less than or equal to 4 mm - No further investigation
- 4-6 mm - CT scanning at 12 months
- 6-8 mm - CT scanning at 6-12 months and 18-24 months
- Greater than 8 mm - CT scanning at 3, 9, and 24 months; contrast-enhanced CT scanning; positron-emission tomography (PET) scanning; and/or biopsy
- High-risk patients
- Less than or equal to 4 mm - CT scanning at 12 months
- 4-6 mm - CT scanning at 6-12 months and 18-24 months
- 6-8 mm - CT scanning at 3–6 months, 9–12 months, and 24 months
- Greater than 8 mm - Same as low-risk patients
- Carefully calculate pretest probability for malignancy, either through experienced clinical judgment or through the use of a validated model, such as Bayesian analysis.17
- Previous chest radiographs should be reviewed to determine if the lesion has been stable over 2 years. If so, no further follow up is necessary, with the exception of pure ground-glass lesions on CT scans, which can be slower growing.
- For lesions with a benign pattern of calcification, further testing is not necessary.
- Management of indeterminate lesions greater than 8-10 mm depends on clinical probability of malignancy, as follows:
- Low probability - Serial CT scanning at 3, 6, 12, and 24 months
- Intermediate probability - 18-Fluorodeoxyglucose (FDG) PET scanning, contrast-enhanced CT scanning, transthoracic needle aspiration (TTNA), and/or transbronchial needle aspiration (TBNA) (Thoracoscopic diagnosis is recommended for patients who wish to have a surgical diagnosis if the lesion is in the peripheral third of the lung.)
- High probability - Surgical resection
- Subcentimeter lesions - Same as Fleischner Society, as listed above
- Any unequivocal growth noted during follow up - Definitive tissue diagnosis needed
Surgical Care
When a lesion is likely to be malignant, surgical resection—not TTNA or observation—is often used.
- The 2007 ACCP guidelines recommend that patients who have indeterminate lung nodules with a high probability of malignancy undergo thoracoscopic wedge resections if the lesion is in the peripheral third of the lung. This is because of the relatively low morbidity and mortality associated with the procedure compared with thoracotomy.18 If frozen sections show evidence of malignancy, anatomic resection with mediastinal lymph node sampling or dissection may be performed.
- Localization using methylene blue injection or wire placement has facilitated successful resection of smaller nodules with video-assisted thoracoscopic surgery (VATS). Intraoperative ultrasonography is also suggested as a means of nodule localization during VATS.19
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| Differential Diagnoses & Workup: Solitary Pulmonary Nodule |
Treatment & Medication: Solitary Pulmonary Nodule |
| Follow-up: Solitary Pulmonary Nodule |
| Multimedia: Solitary Pulmonary Nodule |
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References
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Further Reading
Keywords
solitary pulmonary nodule, SPN, early lung cancer, histoplasmosis, coccidioidomycosis, blastomycosis, pulmonary mycosis, tuberculosis, TB, bronchogenic carcinoma, nocardiosis, asbestos exposure, radon exposure, nickel exposure, chromium exposure, vinyl chloride exposure, polycyclic hydrocarbon exposure, chemical exposure, industrial exposure, bronchogenic cancer, bronchogenic malignancy, pulmonary mycosis, mycosis, lung nodule, malignant nodule, lung lesion, lung malignancy, neoplasm, primary neoplasm, lung neoplasm, granuloma, infectious granuloma, lung granuloma, benign lung lesion, hamartoma, lymphoma, carcinoid, fibroma, neurofibroma, blastoma, sarcoma, lung abscess, round pneumonia, hydatid cyst, rheumatoid arthritis, RA, Wegener granulomatosis, sarcoidosis, lipoid pneumonia, arteriovenous malformation, AVM, lung cyst, pulmonary infarct, round atelectasis, mucoid impaction, mucus impaction, progressive massive fibrosis
Treatment & Medication: Solitary Pulmonary Nodule