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Rheumatoid nodules can vary in size from 2 mm to 5 cm and are usually rather firm to the touch. Quite often they are associated with synovial pockets or bursae. About 5% of people with rheumatoid arthritis have such nodules within two years of disease onset, and the cumulative prevalence is about 20–30%. [4]
About 20% of people with rheumatoid arthritis develop rheumatoid nodules, which are linked to more severe erosive disease in those patients. [2] The nodules are more common in men, typically manifest in the fifth decade of life, and are primarily found on extensor surfaces like the backs of the fingers and elbows, though they can occur anywhere.
Additionally, swan-neck deformity can be caused by weakening or tearing of the ligament and tendon on the middle joint of a finger. [10] Other causes of swan-neck deformity include untreated mallet finger, muscle spasticity, physical hand trauma, and many others.
Nodules in skin include dermatofibroma [5] and pyogenic granuloma. [6] Nodules may form on tendons and muscles in response to injury, [7] and are frequently found on vocal cords. [8] They may occur in organs such as the lung, [9] or thyroid, [10] or be a sign in other medical conditions such as rheumatoid arthritis. [11]
The typical rheumatoid nodule may be a few millimetres to a few centimetres in diameter and is usually found over bony prominences, such as the elbow, the heel, the knuckles, or other areas that sustain repeated mechanical stress. Nodules are associated with a positive RF (rheumatoid factor) titer, ACPA, and severe erosive arthritis. Rarely ...
Bouchard's nodes are hard, bony outgrowths or gelatinous cysts on the proximal interphalangeal joints (the middle joints of fingers or toes). They are seen in osteoarthritis , where they are caused by the formation of calcific spurs of the articular (joint) cartilage .
Heberden's nodes typically develop in middle age, beginning either with a chronic swelling of the affected joints or the sudden painful onset of redness, numbness, and loss of manual dexterity. This initial inflammation and pain eventually subsides, and the patient is left with a permanent bony outgrowth that often skews the fingertip sideways.
Erythema nodosum (EN) is an inflammatory condition characterized by inflammation of subcutaneous fat tissue, resulting in painful red/blue lumps or nodules that are usually seen symmetrically on both shins, on the thighs, arms, and elsewhere. [1] It can be caused by a variety of conditions but 20 to 50% of cases are idiopathic.