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Lipoma
Benign fatty tumor common in older, overweight dogs; rare in cats.
Key Facts
- Soft, rubbery lump under skin — most common benign tumor
- Needle aspirate shows fat droplets for diagnosis
- Most lipomas do not need removal unless uncomfortable or limiting movement
- Infiltrative lipomas grow into surrounding tissue — 36% recurrence after removal
- Liposarcoma is rare malignant form
- Mast cell tumors and hemangiopericytomas can mimic lipomas
- Lipomas shrink with weight loss but rarely disappear completely