Ultrasound Guided Biopsies

Ultrasound-Guided Biopsies — Lesson Overview

What Is an Ultrasound-Guided Biopsy?

An ultrasound-guided biopsy is a minimally invasive procedure in which real-time ultrasound imaging is used to direct a needle precisely into a target lesion — most commonly a mass, nodule, or lymph node — to obtain tissue samples for pathological analysis. Unlike surgical biopsy, which requires general anesthesia and an open incision, ultrasound-guided biopsy is performed percutaneously through a small skin puncture, typically under local anesthesia, with patients returning home the same day.

Ultrasound is uniquely suited for biopsy guidance because it provides continuous real-time visualization of both the needle and the target lesion simultaneously, without ionizing radiation, at relatively low cost, and with the flexibility to be performed at the bedside or in a dedicated procedure suite. It is the preferred modality for superficial and easily visualized targets including thyroid nodules, breast masses, superficial lymph nodes, liver lesions, renal masses, and soft tissue tumors.

In interventional radiology, ultrasound-guided biopsy is one of the most frequently performed procedures and serves as a critical gateway in the diagnostic workup of patients with suspected malignancy, infection, or inflammatory disease. Obtaining adequate tissue in a single session — while minimizing patient risk and discomfort — requires a thorough understanding of biopsy technique, needle selection, specimen handling, and complication recognition. The results of the biopsy directly guide oncologic staging, treatment planning, and surgical decision-making, making procedural precision not just a technical goal but a clinical imperative.

What You'll Learn in This Video

By the end of this lesson, you will be able to:

• Explain the role of ultrasound-guided biopsy in the diagnostic workup of suspicious lesions, and understand when it is preferred over CT-guided, MRI-guided, or surgical biopsy based on lesion location, depth, and visibility

• Identify the indications and contraindications for ultrasound-guided biopsy, including lesion characteristics that make a target amenable to ultrasound guidance, and patient factors such as coagulopathy, anticoagulation use, and lesion proximity to critical structures that require additional planning or precaution

• Distinguish between the two primary biopsy techniques — fine needle aspiration (FNA) and core needle biopsy (CNB) — including the differences in needle gauge, tissue yield, specimen type, and clinical scenarios where each is preferred

• Understand biopsy needle design and selection, including cutting versus aspiration needles, coaxial versus non-coaxial technique, automatic spring-loaded biopsy guns, and how needle gauge and throw length are matched to the target lesion and clinical question

• Recognize the relevant anatomy for the most common biopsy targets — thyroid, breast, liver, kidney, lymph node, and soft tissue — including key adjacent structures to avoid such as major vessels, bile ducts, pleura, and bowel

• Understand pre-procedural planning, including review of prior cross-sectional imaging to characterize the lesion, assess vascularity with Doppler ultrasound, identify a safe needle trajectory, and determine the need for pre-procedural laboratory work including INR, platelet count, and medication holds

• Walk through the step-by-step biopsy procedure, including patient positioning, sterile preparation, local anesthesia administration, real-time ultrasound needle visualization using in-plane versus out-of-plane technique, specimen acquisition, and post-biopsy compression and dressing

• Understand the importance of needle visualization during the procedure, including techniques to improve needle echogenicity such as needle angulation, jiggling, and the use of echogenic needles, and why loss of needle tip visualization is a critical safety concern

• Recognize the role of on-site cytopathology (ROSE) — rapid on-site evaluation — in confirming specimen adequacy during the procedure, reducing the need for repeat biopsy, and guiding the number of passes required

• Understand specimen handling and processing, including how core biopsy specimens are placed in formalin, how FNA specimens are smeared or placed in cytology medium, the importance of communication with pathology regarding clinical suspicion, and what ancillary studies such as flow cytometry, molecular testing, or culture may be requested

• Identify procedural and post-procedural complications, including hemorrhage and hematoma formation, pneumothorax for thoracic targets, vasovagal reaction, needle track seeding, infection, and inadvertent injury to adjacent structures — and understand how each is recognized and managed

• Understand post-procedure monitoring and discharge criteria, including the duration of observation, signs that warrant further workup or hospital admission, and how to counsel patients on activity restrictions and warning signs to watch for at home

• Recognize the causes and management of non-diagnostic biopsies, including sampling error, necrotic or fibrotic lesions, inadequate specimen preparation, and the decision-making process around repeat biopsy versus alternative diagnostic approaches