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Bizarre parosteal osteochondromatous proliferation (BPOP), also known as Nora's lesion, [4] is a type of non-cancerous bone tumor belonging to the group of cartilage tumors. [1] [2] [5] It is generally seen in the tubular bones of the hands and feet, [6] where it presents with a rapidly enlarging painless lump in a finger or toe.
Diagnosis is typically based on examination. The ability to shine through the bump or any past decrease in size supports the diagnosis of the bump as a ganglion cyst. [4] Ganglion cysts are usually obvious upon observation. Medical imaging may be considered on infrequent occasions to rule out another diagnosis. [3] [4] Treatment is not necessary.
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.
Aponeurotic fibroma occurs most frequently in the fingers, palms, and soles of the distal extremities. [3] Typically, the tumor is defined as a smaller than 3 cm diameter, firm, non-tender mass that grows slowly. It is prone to infiltrate the surrounding tissue and, following surgical resection, is more likely to recur locally. [4]
Superficial acral fibromyxoma impacts the palm, heel, and ankle in addition to the acral regions, with a clear preference for the periungual and subungual regions of the fingers and toes. [2] It begins as a slow-growing, solitary nodule limited to the dermis and subcutaneous tissue , and it is typically painless. [ 3 ]
They are usually painless, slow-growing, and mobile masses that can occur anywhere in the body where there are fat cells, but are typically found on the trunk and upper extremities. [ 24 ] [ 25 ] Although lipomas can develop at any age, they more commonly appear between the ages of 40 and 60. [ 24 ]
Bosses are usually painless and will never cause more than a slight ache. They tend to be of manageable size, but on occasion the extensor tendons can slide over the bump, which can be annoying. Sometimes there is a ganglion cyst along with the boss.
Dupuytren disease is generally considered painless, but can be painful if nerve tissue is involved, although this is not usually discussed in the literature. [7] The most common finger to be affected is the ring finger; the thumb and index finger are much less often affected. [13]