Merck Manual

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Transthoracic Needle Biopsy


Rebecca Dezube

, MD, MHS, Johns Hopkins University

Last review/revision May 2021 | Modified Sep 2022
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Transthoracic needle biopsy of thoracic or mediastinal structures uses a cutting needle to aspirate a core of tissue for histologic analysis.


Transthoracic needle biopsy is done to evaluate

  • Peripheral lung nodules or masses

  • Hilar, mediastinal, and pleural abnormalities

  • Undiagnosed infiltrates or pneumonias when bronchoscopy is contraindicated or nondiagnostic

When done with the use of computed tomography (CT) guidance and with a skilled cytopathologist in attendance, transthoracic needle biopsy confirms the diagnosis of cancer with > 95% accuracy. Needle biopsy yields an accurate diagnosis in benign processes only 50 to 60% of the time.


  • Bleeding disorder or anticoagulation that cannot be corrected and platelet count <50,000/mcL (< 50 × 109/L)

  • Bullous lung disease

  • Contralateral pneumonectomy

  • Hydatid cyst

  • Intractable coughing

  • Mechanical ventilation

  • Pulmonary hypertension

  • Putrid lung abscess

  • Suspected vascular lesions


Transthoracic needle biopsy is usually done by an interventional radiologist, often with a cytopathologist present.

  • Under sterile conditions, local anesthesia, and imaging guidance—usually CT but sometimes ultrasonography for pleural-based lesions—a biopsy needle is passed into the suspected lesion while patients hold their breath.

  • Lesions are aspirated with or without saline.

  • Two or 3 samples are collected for cytologic and bacteriologic processing.

After the procedure, fluoroscopy and chest x-rays are used to rule out pneumothorax and hemorrhage.


Complications include

  • Pneumothorax (10 to 37%)

  • Hemoptysis (10 to 25%)

  • Parenchymal hemorrhage

  • Air embolism

  • Subcutaneous emphysema

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NOTE: This is the Professional Version. CONSUMERS: View Consumer Version
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