Imaging for a lump or mass (general, non-breast)
Most lumps are benign — sebaceous cysts, lipomas, reactive lymph nodes, ganglion cysts — but many warrant a quick look with ultrasound to confirm what's there. Imaging is the bridge between physical exam and a biopsy or excision decision. This guide covers general soft-tissue lumps; breast lumps are evaluated under a separate breast-imaging pathway (mammography and breast ultrasound), which Precise does not currently offer.
When a lump does and doesn't need imaging
A clearly benign-feeling lump (small, soft, mobile, unchanged for years) often doesn't need imaging unless your physician is uncertain. Imaging is appropriate when:
- The lump is growing, painful, or changing
- It's deep, fixed, or larger than a few centimeters
- The patient has a history of cancer
- It's in a high-risk area (head and neck node, deep soft tissue)
- The exam is uncertain
ACR Appropriateness Criteria typically endorse ultrasound as the initial study for a superficial palpable mass and MRI or CT for deeper or more complex masses.
Which scan for which problem
Soft-tissue ultrasound is the first-line study for a superficial palpable lump. It is fast, radiation-free, and characterizes cysts vs. solid lesions, vascularity, and dimensions.
MRI is the test of choice for deeper soft-tissue masses, suspected sarcoma, or any lesion where surgical planning needs detailed soft-tissue contrast.
CT is used for large or deep lesions, in the abdomen and chest, and when MRI is contraindicated. It is also helpful for masses with calcifications.
Note: breast lumps are evaluated via dedicated mammography and breast ultrasound, which Precise does not currently offer. For a suspected breast lump, your physician should refer you to a women's imaging center.
What the recommended scan shows
Soft-tissue ultrasound shows the size, depth, shape, internal echotexture (cystic vs. solid), and color-Doppler vascularity of a lump. Most benign lesions have characteristic appearances. MRI adds far more information about surrounding structures, marrow invasion, and tissue type, and is critical for surgical or biopsy planning when a lesion is suspicious.
Common diagnoses and what they mean
Lipoma — benign fatty tumor; characteristic on ultrasound and MRI; removal optional.
Sebaceous (epidermoid) cyst — superficial cyst; treated by excision if symptomatic or recurrently infected.
Reactive lymph node — common, benign, often related to a recent infection.
Ganglion cyst — fluid-filled outpouching from a joint or tendon sheath, common at the wrist.
Lymphoma or other malignant lymphadenopathy — abnormal size, shape, or vascularity on ultrasound; biopsy guided by imaging.
Soft-tissue sarcoma — uncommon but important; MRI is the diagnostic study of choice for any deep, large, or suspicious soft-tissue mass.
What happens after results
Reports return within a day. Benign-appearing lesions often need no further workup. Indeterminate or suspicious lesions go to image-guided biopsy or surgical referral. Precise does not currently perform biopsies; your physician will arrange biopsy with an interventional radiologist or surgeon.
How to get the scan at Precise
Bring your physician's order describing the location and size of the lump. Soft-tissue ultrasound takes 20 to 30 minutes. MRI takes about 30 minutes. See our ultrasound service and our MRI service for locations.
Frequently asked questions
How to schedule at Precise
Once you and your physician decide imaging is the right next step, scheduling is quick. Bring your prescription, photo ID, and insurance card.
Find imaging near you
Precise Imaging has locations across California with same-day scheduling, board-certified radiologist reads, and transparent pricing.