01Principles and purposeThe professional or clinical skill and the decisions it supports.
Image-guided intervention is a clinical pathway rather than a needle manoeuvre. The referrer and interventional team first define what decision the procedure should enable: histological classification, molecular testing, microbiological diagnosis, decompression, evacuation of infected material, palliation or temporisation before definitive surgery. Patient factors, target biology and available expertise determine whether percutaneous sampling or drainage is appropriate.
Biopsy may be fine-needle aspiration for cytology or a core sample for tissue architecture and ancillary testing. Drainage may use a needle for aspiration or a catheter left in a collection. CT, ultrasound, fluoroscopy, MRI or fused approaches are selected according to visibility, access and radiation or contrast considerations. A technically safe route still fails if the sample misses viable target tissue or the catheter does not traverse the collection.
CIRSE emphasises patient-centred consultation, review of current imaging, consent, team communication, monitoring and aftercare. Bleeding risk is procedure-specific and medication-specific; a universal drug-holding interval is unsafe. RadiologyInfo patient information highlights that lung biopsy may be limited by emphysema, coagulation disorders or poor respiratory reserve, while abscess drainage can require prolonged catheter management or surgery if percutaneous access is not safe.
Key points
- Image-guided biopsy obtains cells or tissue for diagnosis and treatment planning; drainage samples or removes fluid and can provide source control, decompression or a bridge to surgery.
- The safest access route is chosen from current cross-sectional imaging, target characteristics, adjacent vessels and organs, patient position, respiratory motion and the material required by pathology or microbiology.
- Ultrasound gives real-time, radiation-free needle visualisation when an acoustic window exists; CT gives accurate planning for deep or small targets; fluoroscopy and MRI have selected roles.
- A biopsy plan must specify the tissue diagnosis and ancillary tests needed before sampling, because a technically successful needle pass can still be clinically inadequate.
- Drainage requires assessment of whether a collection is infected, sterile, loculated, fistulating or inaccessible; aspiration alone may be diagnostic, whereas a catheter is often needed for ongoing evacuation.
- Bleeding, infection, organ injury, pneumothorax, inadequate sample, catheter blockage and displacement are anticipated risks. Anticoagulant and antiplatelet decisions depend on procedure bleeding risk, medication and thrombosis risk, with local IR policy and multidisciplinary discussion.
- Post-procedure review is part of the procedure: document observations, specimen destination, drain care, warning symptoms, result ownership and when the catheter or further imaging will be reviewed.
02Situations and prioritiesThe context, relevant information and actions that matter most.
The target is a persistent or suspicious lesion for which imaging cannot establish the diagnosis, and the result will change staging, treatment, surveillance or a multidisciplinary decision.
A fluid collection is clinically relevant because of sepsis, mass effect, pain or failure of medical treatment, and drainage could obtain cultures while relieving or controlling the source of infection. If physiology deteriorates, start urgent sepsis resuscitation and antimicrobial treatment while escalating for immediate source-control review.
No safe window, interposed bowel or vessel, uncorrected bleeding risk, inability to cooperate, unstable physiology or a target that will not yield the requested material may make percutaneous intervention inappropriate. Pause and escalate to senior IR and surgical planning rather than attempting an unsafe route.
A lung or pleural biopsy needs a route planned around emphysema, fissures, bullae, vessels and respiratory motion because pneumothorax and haemorrhage can be clinically important.
Small lesions, necrotic targets, crush artefact, too few cores, wrong container or absent clinical context can produce a non-diagnostic sample despite apparently correct needle placement.
Fever, worsening pain, peritonism, bleeding, reduced output, leakage or sudden loss of catheter position may indicate infection, organ injury, blockage, fistula or displacement and need review.
03Assessment and interpretationHow to gather information, assess the situation and recognise uncertainty.
Consider the information, its meaning and its limitations before deciding what follows.
- 01
Current cross-sectional imaging review - Why
- Define the target, viable component, collection anatomy, safe access window, adjacent structures, prior surgery and the modality best suited to guidance.
- Interpretation and limitations
- Imaging must be recent enough for the clinical situation and reviewed in the procedural plane. If the lesion has changed, ask for additional planning imaging rather than relying on an old report.
- 02
Clinical and laboratory assessment - Why
- Assess indication, sepsis, organ function, respiratory reserve, allergies, pregnancy possibility, medicines and bleeding or thrombotic risk before consent.
- Interpretation and limitations
- Use results proportionately to the planned procedure and local policy. Abnormal platelets, coagulation or renal function require a patient-specific plan; they do not justify an invented universal cancellation threshold.
- 03
Ultrasound guidance - Why
- Provide real-time visualisation for superficial, abdominal, pelvic, vascular or fluid targets when an acoustic window and safe needle path are available.
- Interpretation and limitations
- Track the needle tip continuously, keep the intended structures visible and account for anisotropy, deep targets, bowel gas and operator dependence. Lack of a safe window should prompt another approach, not blind advancement.
- 04
CT or CT-fluoroscopy guidance - Why
- Plan and confirm access to deep, small, air-containing or complex lesions that are poorly seen or poorly localised with ultrasound.
- Interpretation and limitations
- Review the full trajectory, respiratory motion and radiation exposure. CT confirms position but does not guarantee representative tissue or prevent complications such as pneumothorax or bleeding.
- 05
Specimen and fluid studies - Why
- Send material in the correct containers for histology, cytology, flow cytometry, microbiology, molecular testing or biochemical analysis according to the clinical question.
- Interpretation and limitations
- Agree requirements with pathology and microbiology before the procedure. A negative culture or scant tissue may be non-diagnostic, especially after antibiotics, necrosis or inadequate volume.
- 06
Post-procedure imaging or observation - Why
- Detect immediate complications and confirm catheter position or collection response when the organ and procedure make this necessary.
- Interpretation and limitations
- Chest biopsy commonly needs assessment for pneumothorax; drainage needs output, position and clinical response review. The appropriate observation period follows local protocol and patient risk.
04Worked approachesCases with ordered reasoning, an action and a check of the outcome.
01Worked example: abscess drainageMove from sepsis to source controlA patient has fever, abdominal pain and CT evidence of a postoperative pelvic collection with a potential percutaneous window.+
- 1Assess physiology, antibiotics, cultures, renal function, allergy history, analgesia and bleeding or thrombotic risk; involve surgery and IR because drainage is one part of source-control planning.
- 2Review the current CT to choose position, route, catheter strategy and whether bowel, bladder, vessels or solid organs intervene. Explain aspiration, catheter drainage, possible repeat intervention and surgery if access fails.
- 3Under sterile technique and appropriate monitoring, use ultrasound or CT to access the collection, aspirate for microbiology, place and secure a catheter when ongoing drainage is required, and document output and specimens.
- 4Review fever, pain, inflammatory markers, drain output and imaging response. Flush, reposition or exchange only under the agreed protocol; remove the catheter when the collection and clinical course support removal, and verify that a persistent cavity or fistula has not been missed.
02Worked example: lung nodule biopsyMake the tissue answer fit the cancer questionCT shows a peripheral lung nodule that is suspicious for malignancy and not readily reachable by bronchoscopy; histology and molecular testing will alter treatment.+
- 1Confirm the clinical decision, target size and location, prior imaging, lung function, oxygenation, emphysema, anticoagulant or antiplatelet therapy and ability to cooperate with breath-holding.
- 2Plan a short, safe CT-guided trajectory that avoids fissures, bullae and major vessels, and agree core versus aspiration material and required pathology or molecular handling before needle placement.
- 3Use local anaesthesia and monitoring, confirm needle position, obtain the minimum representative samples needed, apply a dressing and arrange post-procedure observation and imaging according to local practice.
- 4Check pathology adequacy and complication status rather than declaring success at needle removal. Escalate dyspnoea, chest pain, tachycardia or desaturation for pneumothorax assessment and communicate an indeterminate result to the MDT with the next diagnostic option.
03Risk and aftercareClose the loop around the interventionA planned biopsy or drain has a non-trivial bleeding, infection, respiratory or organ-injury risk, or the result will determine major treatment.+
- 1Reconcile consent with the actual route, alternatives, expected yield, possible repeat procedure, surgery and complications; document who will receive and act on results.
- 2Use a checklist, sterile technique, appropriate monitoring, sedation plan and team time-out. Do not apply a medication hold or reversal without weighing procedural bleeding risk against thrombosis risk and consulting local guidance.
- 3Give written aftercare with drain instructions or wound care, expected symptoms, urgent warning signs, contact route, specimen tracking and planned result review.
- 4At follow-up, combine clinical response, laboratory trends, pathology or microbiology, catheter output and imaging. If the procedure did not answer the question, re-enter the MDT pathway rather than repeating an identical low-yield attempt.
05Feedback, follow-up and evidenceReview outcomes, seek feedback and identify what to improve.
- Before the procedure, confirm indication, allergies, pregnancy possibility, current medicines, relevant imaging, laboratory results, analgesia or sedation plan and the intended specimen or source-control endpoint.
- During the procedure, monitor pulse, blood pressure, oxygenation and, when sedation is used, the additional monitoring specified by local policy; assign monitoring responsibility clearly.
- After biopsy, observe for bleeding, pain, fever, neurological or respiratory change and organ-specific complications; after thoracic biopsy, have a low threshold to assess for pneumothorax when symptoms or local protocol indicate.
- For a drain, record output, colour, consistency, flush or suction instructions, insertion site, tube security and whether clinical improvement matches drainage.
- Track pathology, cytology, culture and molecular results to a named clinician and document whether the result is adequate for the intended decision.
- Review persistent fever, rising inflammatory markers, ongoing sepsis, inadequate drainage, catheter blockage or displacement with IR and the treating team rather than escalating antibiotics alone.
- At removal or exchange, verify that the collection or target has been reassessed and that the patient understands recurrence or delayed complication advice.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
Start with the decision
The best target is the one that answers the clinical question safely and yields material in the form pathology, microbiology or molecular testing can use.
Real-time is not always safest
Ultrasound permits continuous needle tracking, but CT may be safer for deep, small or air-containing targets when ultrasound cannot show the full route.
Drainage is an endpoint
Placing a catheter is a technical event; source control requires output, clinical improvement, culture interpretation and reassessment of loculations or fistulae.
Anticoagulation is contextual
Bleeding risk varies by procedure and organ, while stopping therapy carries thrombotic risk. Use current local or society guidance and a patient-specific discussion.
Adequacy is clinical
A sample can be technically obtained yet fail to contain viable tumour, diagnostic architecture or enough material for requested ancillary tests.
Consent includes failure
Patients should understand that an inaccessible target, inadequate specimen, blocked drain or complication may require repeat intervention, surgery or a different diagnostic route.
07Common pitfallsFrequent interpretation and management errors.
- 01
Sampling a necrotic or non-representative area because target viability and the clinical question were not reviewed before the procedure.
- 02
Advancing a needle when the tip is not clearly visualised or the planned path has become unsafe with patient motion.
- 03
Using a universal anticoagulant or antiplatelet holding interval without identifying the procedure, drug, renal function and thrombosis risk.
- 04
Sending fluid or tissue in the wrong container, without a clinical question, or without alerting pathology to suspected infection, lymphoma or molecular testing needs.
- 05
Calling a drain successful because it was inserted, without monitoring output, clinical response, culture and residual collection.
- 06
Omitting consent for non-diagnostic sampling, repeat procedure, pneumothorax, bleeding, organ injury and surgical escalation where relevant.
- 07
Leaving result ownership unclear so a malignant, infectious or inadequate report is not acted on.