Ossifying parosteal lipoma with exuberant cortical reaction

Abstract

Lipomas lying close to bone are called parosteal lipomas. They usually cause some bone reaction. We are reporting a dramatic example of this rare condition and have discussed the differential diagnosis and management.

Osteochondrolipoma of the Submandibular Region: A Case Report and Review of the Literature

“…Although our tumor would fit the description of osteolipoma, its attachment to the periosteum, however, would be in favor of an ossifying parosteal lipoma. Only 9 cases of ossifying parosteal lipomas have been described in the literature: 7 in the upper extremities (femur 5, humerus 2), 1 in the trunk (rib) and 1 in the mandible [43][44][45][46][47][48][49][50][51]. An underlying bone reaction was always present (uneven and undulating cortex, hyperostosis, osseous excrescences), but was absent in our report.…”

Parosteal Lipoma of the Femur With Hyperostosis: Case Report and Literature Review

“…• In 1994 in Saudi Arabia, a large-volume parosteal lipoma with exuberant hyperostosis was found in the right thigh of a young patient; however, in spite of the characteristics, the lipoma was not surgically resected. 7 • Also in 1994, another finding was published concerning this rare benign neoplasia in the femur, also with relevant reaction of bone. 3 • Genetic characteristics were shown in the article by Bridge et al 18 • Another case was reported in 1999 by Kim et al…”

“…3,6,13 These changes include bone deformity, cortical erosion, and overproduction of the cortical bone (hyperostosis). 3,[6][7][8] More than half of parosteal lipomas presenting bone reactions are associated with hyperostosis. 6 Several authors consider that cortical hyperostosis can be explained by the contact of the lipoma with the bone, 3,14 being presumably caused by stimulation or irritation of the periosteum.…”

“…7 The most frequent complaints are a tumoral convexity presenting as a visible or palpable mass 8 or a mild-intensity pain. A literature review in the English language MEDLINE database revealed that 12 new cases have been described since the first detailed report of a parosteal lipoma of the femur with hyperostosis by Kenin et al 9 in 1959.…”

Parosteal Lipoma of Femur—A Case Report

“…The bone may be normal inspite of the close relationship of lipoma with the periosteum [12] [13], but reactive changes in the adjacent bone [14] such as bone deformity, cortical erosion, and bony hyperostosis [15] [16] had been detected. More than half of parosteal lipomas presenting bone reactions are associated with hyperostosis [13] [17].…”