Ultrasound Right Axillary Region

A right axillary ultrasound is a noninvasive imaging exam of the right armpit using high-frequency sound waves to visualize lymph nodes, soft-tissue masses, cysts, or infection. It evaluates node size, shape and vascularity, assesses the axillary tail of the breast, and can guide needle biopsy or drainage. The test is painless, involves no radiation, provides real-time images, and typically takes about 10–30 minutes.

The right axillary region is the right-side armpit area between the lateral chest wall and the arm. Bounded by the pectoral muscles anteriorly, latissimus dorsi and teres major posteriorly, and the humerus laterally, it contains skin, fat, axillary lymph nodes, branches of the axillary artery and vein, and the cords/branches of the brachial plexus; clinically important for lymphatic drainage and neurovascular structures.

Yes — axillary (underarm) lymph nodes can be cancerous. They may represent metastatic spread (commonly from breast cancer) or primary lymphoid cancers, though many swollen nodes are benign/reactive to infection. Suspicious features include a hard, fixed, painless, persistent lump. Evaluation typically involves clinical exam, imaging (ultrasound/mammography), and needle or core biopsy to confirm diagnosis and guide treatment.

It’s common to see axillary lymph nodes on ultrasound. Normal nodes are small, oval, have a fatty hilum and thin cortex, and may enlarge transiently after infection or vaccination. Features that raise concern include rounded shape, cortical thickening or focal bulge, loss of fatty hilum, irregular margins, or abnormal blood flow—these warrant clinical correlation and possible biopsy.

On ultrasound, cancerous lymph nodes are often enlarged and round rather than oval, with loss of the central fatty hilum, asymmetric or focal cortical thickening and heterogeneous echotexture. They may show irregular margins, internal necrosis or calcification and increased peripheral (rim) vascularity on Doppler. Nodes can be matted or form conglomerates. These features raise suspicion but require biopsy for diagnosis.

Palpable axillary (underarm) lymph nodes are often normal—small, soft, mobile nodes commonly appear after infections, inflammation, or vaccination and usually resolve. Concerning features include large (>2 cm), hard, fixed, rapidly enlarging, persistently swollen, painful nodes or accompanying fever, night sweats, weight loss, or breast changes. If any of these occur or nodes persist beyond a few weeks, seek medical evaluation.