Physical Exam Documentation for Lipoma
A lipoma should be documented as a soft, mobile, well-defined subcutaneous mass with smooth borders, typically painless on palpation, and demonstrating a characteristic soft-elastic or doughy consistency.
Essential Physical Exam Components to Document
Location and Size
- Anatomical site: Specify exact location (e.g., "posterior upper arm," "anterior thigh")
- Dimensions: Measure in centimeters (length × width × height if palpable)
- Depth: Note whether superficial (subcutaneous) or appears deeper
- Note: Lipomas >10 cm or >1 kg are classified as "giant lipomas" 1, 2
Palpation Characteristics
- Consistency: Soft, doughy, or soft-elastic texture
- Mobility: Should be mobile relative to underlying structures
- Borders: Well-defined, smooth margins
- Tenderness: Typically non-tender (document if painful, as this is atypical)
- Fluctuance: Absent (helps differentiate from cysts)
- Compressibility: Note degree of compressibility
Surface Characteristics
- Skin changes: Document any overlying skin changes (typically none)
- Color: May have yellowish hue if very superficial 3
- Temperature: Should be normal (not warm)
- Attachment: Not fixed to skin or underlying fascia
Special Maneuvers
- "Pillow sign": Document if present when probed with fingers (mass indents easily like a pillow) - though this has only 40% sensitivity but 98% specificity 3
- Slip sign: The mass should "slip" away from examining fingers
- Transillumination: Negative (helps rule out cyst)
Critical Documentation Points
Red Flags to Document (Suggest Alternative Diagnosis)
- Firm or hard consistency (consider atypical lipomatous tumor/liposarcoma)
- Fixed to underlying structures (concerning for malignancy)
- Rapid growth (requires imaging to exclude malignancy) 2
- Deep location (subfascial or intramuscular - higher risk of atypical lipomatous tumor) 4
- Size >5 cm, especially if deep (warrants imaging per guidelines) 4
- Pain (atypical for simple lipoma)
- Irregular borders (concerning feature)
Documentation Template Example
"Well-circumscribed, mobile, soft subcutaneous mass measuring approximately [X × Y] cm located in the [anatomical location]. Mass has smooth borders, soft-elastic consistency, non-tender to palpation, mobile in all directions, not fixed to overlying skin or underlying fascia. No overlying skin changes, warmth, or erythema. Pillow sign [present/absent]. No palpable lymphadenopathy."
Important Clinical Caveats
Physical examination alone is only 85% accurate for diagnosing lipomas 5. Therefore:
- Superficial lesions <5 cm: Clinical diagnosis may be sufficient if all classic features present
- Any atypical features: Require ultrasound or further imaging 5, 4
- Deep-seated masses: Cannot be reliably diagnosed by exam alone - imaging mandatory 4
- Lesions >5 cm or deep to fascia: Consider ultrasound initially, with MRI if diagnostic uncertainty 4
When Imaging is Indicated Based on Exam
- Size >5 cm
- Deep location (subfascial)
- Firm consistency
- Fixed to underlying structures
- Rapid growth history
- Painful
- Irregular borders
- Located in areas difficult to assess (flank, paraspinal, groin, deep hand/foot) 5
The most common diagnostic error is assuming all soft subcutaneous masses are benign lipomas - atypical lipomatous tumors (well-differentiated liposarcomas) can present similarly but tend to be larger, deeper, and in the lower extremity 4. When in doubt, ultrasound provides 94.1% sensitivity and 99.7% specificity for superficial masses 5.