Differential Diagnosis for a Growing, Tender Bump on the Elbow
- Single Most Likely Diagnosis
- Olecranon bursitis: This condition is characterized by inflammation of the bursa at the elbow, leading to a swollen, tender bump. It's a common issue, especially in individuals who frequently lean on their elbows or have experienced trauma to the area.
- Other Likely Diagnoses
- Elbow cyst or ganglion: These are fluid-filled lumps that can develop near joints or tendons, often becoming tender and growing over time.
- Lipoma: A benign fatty tumor that can appear as a growing bump, potentially becoming tender if it presses on nearby nerves or structures.
- Abscess or infected sebaceous cyst: An infection in the skin or a cyst can cause a growing, tender bump, especially if it becomes filled with pus.
- Do Not Miss Diagnoses
- Osteosarcoma or other bone tumors: Although rare, these malignant tumors can present as a growing bump on the elbow and are critical to diagnose early for effective treatment.
- Septic arthritis or osteomyelitis: Infections within the joint or bone can cause swelling, tenderness, and a growing bump, requiring prompt antibiotic treatment to prevent serious complications.
- Soft tissue sarcoma: A rare but potentially deadly tumor that can appear as a growing mass, emphasizing the importance of early diagnosis and treatment.
- Rare Diagnoses
- Gouty tophus: A deposit of uric acid crystals that can form a lump under the skin, often near joints, and can become tender during gout attacks.
- Rheumatoid nodule: Associated with rheumatoid arthritis, these nodules can appear on the skin, including near the elbow, and may be tender.
- Xanthoma: A rare, benign growth that can appear as a bump on the skin, sometimes related to lipid disorders.