Florid reactive periostitis is a rare benign lesion, included in a group of reactive bone and soft tissue lesions that create a frequent diagnostic problem.
Florid reactive periostitis occurring often in the 2nd and 3rd decade of life with a male to female ratio of 1 to 1.5, even though the affected age group stated in the literature varied from 5 to 70 years 1-4.
The lesion is usually formed in the hand phalanges, mainly in the proximal phalanx, and is characterized by an excessive osteoblast formation in a fibrous proliferative stroma arising at the level of the finger periosteum.
Soft tissue expansion and periosteal bone new bone formation that may seem as lamellar or mature bone. The cortex is typically intact.
Differential diagnoses include 5:
- 1. Spjut HJ, Dorfman HD. Florid reactive periostitis of the tubular bones of the hands and feet. A benign lesion which may simulate osteosarcoma. Am J Surg Pathol 1981; 5(05):423-433.
- 2. Rogers GF, Brzezienski MA. Florid reactive periostitis of the middle phalanx: a case report and review of the literature. J Hand Surg Am 1999; 24(05):1014-1018.
- 3. Dupree WB, Enzinger FM. Fibro-osseous pseudotumor of the digits. Cancer 1986; 58(09):2103-2109.
- 4. Fechner RE, Mills SE. Tumors of the Bones and Joints (Atlas of Tumor Pathology Series IV). Washington DC: Armed Forced Institute Pathology; 1993:268-269.
- 5. Florid Reactive Periostitis of the Proximal Phalanx-Case Report and Literature Review. Rev Bras Ortop (Sao Paulo). 2019 May; 54(3):335-338. doi: 10.1055/s-0039-1692430.