Parosteal Lipoma Associated with Underlying Recurrent Bizarre Parosteal Osteochondromatous Proliferation (Nora's Lesion) of the Hand / 대한정형외과학회잡지

Parosteal lipoma is a benign tumor of the mature adipose tissue that contacts the periosteum of the underlying bone directly. The tumor commonly arises in the long bones, such as the femur, radius or tibia, and often exhibits underlying osseous changes, such as a cortical hyperostosis or erosion. Parosteal lipoma arising in a finger is rare. Furthermore, there are no reports of parosteal lipoma associated with underlying bizarre parosteal osteochondromatous proliferation. The authors present a rare case of parosteal lipoma of the proximal phalanx of the little finger accompanied by recurrent bizarre paroteal osteochondromatous proliferation in a 64-year-old male patient who had previously undergone an excisional biopsy at the same location 8 years earlier.

Parosteal Lipoma of the Humerus: A Case Report

Background and Objectives: To study the imaging and histopathological characteristic of a tumorous mass and to differentiate parosteal lipoma from similar looking osteochondroma or myositis ossificans. Presentation of case: A 54-year old female presented with more than 5-years history of a large swelling in the anterolateral aspect of upper arm. The case study was carried out at the First Hospital of Yangtze University situated in Jingzhou city of Hubei province, PRC in 2015 September. Discussion: Radiological Imaging and Pathological examination confirmed the diagnosis of parosteal lipoma. Computed tomography (CT) and Magnetic Resonance Imaging (MRI) showed the mass to be fatty in nature with characteristic pedunculated exostosis abutting the periosteum. Histopathological sections showed the mass to be composed of mature adipose tissue without atypia or lipoblast. Conclusion: Parosteal lipomas are rare neoplasias with no proven malignant potential and requires high index of suspicion for proper diagnosis and effective management.

Parosteal Lipoma in the Metatarsus: A Case Report / 대한족부족관절학회지

We experienced a rare case of parosteal lipoma, which located on the periosteum of the foot 4th metatarsus. A 22-year-old woman visited the hospital with painful mass in her foot. Based on the assessment of plain radiographs, computed tomography scan, and magnetic resonance image, it was suspected as lipoma. Marginal excision was performed and parosteal lipoma was confirmed histologically. Any local recurrence and complications were not observed in 2 years after surgery.

Parosteal Lipoma of the Femur with Hyperostosis: A Case Report / 대한골관절종양학회지

Parosteal lipoma is a rare kind of lipoma that occurring adipous tissue around the periosteum. It has been reported most commonly in the femur, the radius, the tibia and the fibular. Treatment consists of resecting the lipomatous tumor with further exeresis of the bone and periosteal excrescence in cases with hyperostosis. The authors report a rare case of parosteal lipoma occurring at the medial portion of the femur shaft with a review of the relevant literatures.

CT findings of parosteal lipoma with hyperostosis / 中华放射学杂志

Objective To determine the characteristics of paresteal lipomas with hypemstosis (esteochondromas or osseous protuberances)on CT images and to improve the knowledge of diagnosis and differential diagnosis of the disease.Methods CT images and clinical history of 6 patients with pathologically confirmed parosteal lipemas with hyperostosis were retrospectively reviewed.All of the 6 patients underwent plain CT scans.Results CT images clearly show lipomas and osseous projections or osteochondroma in the 6 cases.Parosteal lipomas were found with osteochondronms in 2 cages(1 at the isehium.and the other 1 at the femoral trochanter)and willl osseous protuberances in 4 cases(2 at the diaphysis offemurs.1 at the diaphysis oftibia and the other 1 at the sternum).These osteochondromas and ossous protuberances were surrounded by the adipose component of the neoplasm and had a firm attachment oftlle neoplasm to the underlying bone.The size ofthe osseous projections varied from 0.3 cm x1.2 cm to 6.0 cm x 4.0 cm.The shape of the osgeous projections was various.Osteochondromas found in 2 cases showed cortical continuity with the adjacent bone together with marrow continuity with tlle adjacent bone marrow.In the 4 cages of parosteal lipama with osseous protuberances,2 to 4 osseous protuberances were found in 2 case8 and solitary osseous protuberance were found in the other 2 cases.The lipomatoas companent showed typical features of adipose tissue on all images.The size of the lipomas varied from 3.0 cm ×2.0 cm to 11.0 cm×10.0 cm with clear border.Fibrous septa of different thickness were found within the adipose tissue.There was essification and (or) calcification in 1 case and muscle atrophy in 2 espies.Conclusions CT scan is useful in the presurgical evaluation of parosteal lipomas witll osteochondromas or osseous protuberances became it can demonstrates the morphology,location and extent of the lesions.and it can show their relationship to the surrounding structures. It is important for differential diagnosis and preoperative assessment of the lesion.

Manifestation of clinical image and pathalogical characters of parosteal lipoma(literature review with a report of 14 cases) / 中国矫形外科杂志

[Objective]The naming,pathogeny,clinic,patho logical character and image manifestation of the parosteal lipoma were discussed in this paper combined with the literatures.[Method]Combined the 20 cases reported in the internal literatures,the photographs have been taken in all the 34 cases,CT in the 18 cases,MRI in the 4 cases.[Result]The data demonstrated that this disease betided in any age,more in the adult,developed more in the long canal bone of the limb,and developed in the flat bone(pelvis,scapula,costal bone,patella),anomaly bone(thoracic verthbrae,lumbar,ansa sacralis),cauda bone,short canal bone and instep bone secondly.The rate of the error diagnosis were 40.91% in the clinic,27.27% in the X-ray and no one in the CT and MRI.The excision was done in all the 34 cases,and lipoma were diagnosed in pathology,3 cases were malignant slightly.Followed up for 2 to 10 years,only 1 cases recurring and malignant.[Conclusion]The name of the parosteal lipoma is optimal,the pathogeny is not clear,and related to the heredity,hurt and inflamation.There is lipoma with bone pedicel in pathology;and adipose tissuse in cytology.There are characteristic changes in the X-ray,CT and MRI.

Two cases of Parosteal Lipoma on the Forehead / 대한피부과학회지

Parosteal lipoma is a rare benign lipomatous neoplasm and found in close or direct apposition to bone, most commonly in the extremities. In the forehead, it is called subgaleal lipoma because of the location between the galea and the periosteum of the frontal bone. Clinically it presents as a round to oval, smooth, firm and relatively fixed, flat or dome shaped mass, unlike the usual lipoma. A parosteal lipoma in the forehead tends to be misdiagnosed initially as other superficial lesions such as epidermal cyst. Therefore, clinical recognition of the tumor and its location is important preoperatively so that the incision is deep enough to find the lesion and to make the correct diagnosis of most firm forehead masses.