Disease Description (Causes and Symptoms)
- Definition: A pulmonary nodule is a localized mass (nodule) measuring 3 cm or less in diameter that is observed radiologically within the lung. When there is only one, it is called a solitary pulmonary nodule (SPN), and when there are several, they are called multiple pulmonary nodules.
- Main causes
- Benign: Tuberculous and nontuberculous granulomas (tuberculosis, fungal infections, etc.), hamartoma (e.g., benign lung tumor, lung abscess), post-inflammatory scars, etc.
- Malignant: Primary lung cancer (non-small cell lung cancer, small cell lung cancer), pulmonary metastasis from cancer in another organ
- Pathophysiology summary: Nodules form due to localized tissue changes (inflammatory granulomas, tumor proliferation, etc.). The likelihood of malignancy is estimated based on imaging findings (size, border characteristics, presence or absence of calcification, growth, etc.). If there has been no long-term change in the nodule and calcification is prominent, it is highly likely to be benign.
- Symptoms: Most are asymptomatic (found incidentally on chest imaging). If the nodule is large or compresses the airway or blood vessels, symptoms such as coughing, shortness of breath, and recurrent pneumonia may occur.
Treatment Methods
- Principle: A pulmonary nodule itself is not a disease name; treatment is determined by the cause of the nodule. An observation, testing, and treatment plan is established based on the patient's pulmonary nodule size, shape, whether it is growing, PET findings, and medical history (history of cancer, tuberculosis risk, etc.).
- General approach based on imaging findings
- Low risk (small and stable, with benign findings such as calcification): Follow-up observation (the interval and duration are determined according to the patient's risk factors).
- Suspicious findings (increase in size, irregular margins, intense FDG uptake, etc.): Additional imaging (PET-CT) and biopsy may be considered.
- Medication treatment
- Infectious causes: Medication based on the causative organism, such as antibiotics for a bacterial abscess, anti-tuberculosis drugs for tuberculosis, and antifungal drugs for a fungal infection.
- In malignant cases: Perioperative (adjuvant) chemotherapy, targeted therapy, immunotherapy, etc., depending on the tumor type and genetic test results.
- Procedures and surgery
- Diagnostic and therapeutic procedures: Sputum cytology, bronchoscopy (endobronchial biopsy), CT-guided percutaneous pulmonary needle biopsy (needle biopsy), resection and tissue diagnosis through video-assisted thoracic surgery (VATS) or open thoracotomy.
- Therapeutic resection: If primary lung cancer is confirmed and surgery is indicated, wedge resection, partial lung resection, lobectomy, etc.
- Radiation therapy: Stereotactic body radiation therapy (SBRT) and other options may be considered in patients who cannot undergo surgery.
- Lifestyle management and precautions
- Smokers should quit smoking (essential to reduce cancer risk and preserve remaining lung function).
- Follow the regular follow-up schedule (at the intervals recommended by the doctor), and contact your doctor immediately if new symptoms such as respiratory symptoms or weight loss occur.
- After a biopsy or procedure, monitoring is necessary because complications such as pneumothorax and bleeding may occur.
- Complications (related to procedures or lack of treatment)
- Pneumothorax, bleeding, and infection during biopsy
- If a malignant nodule is only observed for an extended period, it may progress and metastasis may occur
Checklist Before an Outpatient Visit (Including Items to Bring and Example Questions)
- Items to prepare/bring
- All previous images, including chest X-rays and CT scans (if possible, the original CD/USB or hospital transfer)
- A list of currently used medications (including prescription drugs, over-the-counter medications, and health supplements)
- Medical history: Previous tuberculosis, fungal infection, or cancer; recent history of infection (fever, cough, etc.)
- Smoking history (current/former smoking, pack-years), occupational history (exposure to dust or carcinogens)
- Allergies and bleeding tendency (including whether anticoagulants are being taken)
- Information to organize in advance for the outpatient visit
- Date the nodule was first discovered/type of examination, and whether there have been changes compared with previous images (comparison images if possible)
- Recent weight changes, loss of appetite, fatigue, hemoptysis, and other systemic symptoms
- Frequently asked items during a visit (records that are useful for the patient to prepare)
- Changes in the nodule's size and shape (if any, notes by date), and the onset and characteristics of recent respiratory symptoms
- Example questions (short sentences to show medical staff)
- "Has the size of the nodule changed compared with the previous chest CT?"
- "What is the follow-up interval?"
Examples of General Questions to Ask the Doctor
- "How is the likelihood of malignancy (risk level) of this nodule assessed?"
- "Why do you recommend follow-up observation or additional testing, and what follow-up interval do you recommend?"
- "If you recommend a biopsy (or PET-CT), what are the risks (pneumothorax, bleeding) and the expected diagnostic benefits?"
- "In my current situation, are there any essential changes I need to make regarding smoking cessation or lifestyle habits?"
Examples of Disease-Specific Questions
- "To what extent do the size of this nodule (e.g., how many mm) and the appearance of its edges (smooth, lobulated, or spiculated) suggest the possibility of malignancy?"
- "If my pulmonary nodule is 6–8 mm, is follow-up sufficient, or should PET-CT/biopsy be performed first? What criteria do you use for this recommendation?"
Note: The actual testing and treatment plan and follow-up interval vary depending on patient-specific risk factors, including age, smoking history, history of cancer, and the imaging characteristics of the nodule. Please consult your doctor for specific assessment and recommendations.