Monostotic fibrous dysplasia of jaw bones: a case series.

BACKGROUND: Fibrous dysplasia (FD) is a benign fibro-osseous lesion, a skeletal developmental anomaly of the bone-forming mesenchyme. The diagnosis of fibro-osseous lesions, particularly those of the jaw bones, poses significant challenges to clinicians and pathologists since it requires a correlation of clinical, radiological, histological, and surgical findings. Accurate and specific diagnosis is crucial as treatment modalities differ with different fibro-osseous lesions. METHODS: This retrospective analysis presents a case series of a rare condition of monostotic FD in the maxillofacial region affecting jaw bones diagnosed and/or treated over period of 10 years. RESULTS: Five cases of monostotic FD were diagnosed and treated between a period of 2013 and 2023. The cases from the 2nd to 8th decade were included in the analysis with equal involvement of males and females. Out of five cases, four cases were involving maxilla and 1 showed involvement of mandible. CONCLUSION: FD is a rare entity affecting the jaw bones which often lead to disfigurement of face. Early detection is warranted to decrease potential complications. In addition, genetic analysis could help in understanding the occurrence in certain population.

Frequency of spontaneous osteosarcomatous transformation of craniofacial fibrous dysplasia: a systematic review.

OBJECTIVE: A systematic review was undertaken to examine the spontaneous of craniofacial fibrous dysplasia (FD) into osteosarcoma (OS). STUDY DESIGN: Five databases were searched, and data were evaluated in 2 subsets: (1) frequency analysis involving only cross-sectional studies that specifically examined patients for osteosarcomatous transformation, thereby allowing a calculation of the frequency of transformation of craniofacial FD, and (2) case analysis of case reports and case series of FD that underwent osteosarcomatous transformation. Quality assessment of the studies in the frequency and case analyses was performed. RESULTS: Seven cross-sectional studies involving 779 patients in the frequency analysis documented transformation of craniofacial FD into OS in 13 patients, for a frequency of 1.67%. Of the 18 separate cases of osteosarcomatous transformation in the case analysis, 11 (61.1%) occurred in females, 11 (61.1%) developed from monostotic FD, and 7 (38.9%) arose in the mandible, with 5 in the maxilla (27.8%) and 6 (33.3%) in other craniofacial sites. The mean age of the patients at the time of malignant diagnosis was 36.4 years, with an average of 11.3 years from FD diagnosis to the appearance of OS. The quality of the articles ranged from fair to excellent. CONCLUSIONS: The risk of osteosarcomatous transformation of craniofacial FD is low, but the possibility of transformation should be taken into consideration by clinicians, as this will guide treatment and follow-up regimens.

Malignant transformation of monostotic fibrous dysplasia into angiosarcoma in the proximal tibia.

The majority of bone angiosarcomas are primary tumors while secondary angiosarcomas arise after radiation therapy or bone infarctus. This article presents a case of malignant transformation of monostotic fibrous dysplasia into angiosarcoma. An 80-year-old female presented with pain on right cruris. Radiological examination revealed a lesion with lytic areas and destruction of cortical bone on right tibia. Gross and histopathological examination showed two areas with an abrupt transition. The solid component was composed of curved, immature bony trabeculae in a fibroblastic stroma. The other component involved epitheloid cells forming slit-like vascular spaces. The diagnosis of angiosarcoma and fibrous dysplasia was given. Malignant transformation of fibrous dysplasia into angiosarcoma is extremely rare; as this is the sixth case in the existing literature. Prognosis of fibrous dysplasia is generally good and less than 1% of the patients develop a malignant tumor. Therefore, patients with fibrous dysplasia should be offered a life-long follow-up.

Fibrous dysplasia limited to an ossicle.

Fibrous dysplasia is an unusual pathologic condition caused by abnormal bone metabolism. Temporal bone involvement is often seen, but it is uncommon to find fibrous dysplasia limited to the middle ear, especially originating in and confined to a single ossicle. Here we report a case of osteofibrous dysplasia limited exclusively to an ossicle (malleus) causing gradual conductive hearing loss, which recovered after eventual complete removal of the dysplastic area. The lesion showed firm attachment to adjacent structures and initial removal was not possible. This report provides information to help other otologic surgeons facing similar conditions.

Radiographic Follow-Up of Fibrous Dysplasia in 138 Patients.

OBJECTIVE. The purpose of this study was to explore the temporal changes in fibrous dysplasia (FD) at radiographic follow-up. MATERIALS AND METHODS. A total of 138 patients with FD who had undergone extremity radiography at least twice with a minimum 12-month interval between examinations were enrolled in this study. FD was monostotic in 99 patients and polyostotic in 39 patients. Patients were also classified according to skeletal maturity as follows: Patients 16 years old or younger were classified in the skeletally immature group (n = 34), and patients 17 years old or older were classified in the skeletally mature group (n = 104). We compared the initial and follow-up radiographs for the following findings: lesion size, opacity, sclerotic rim, calcification, and trabeculation. RESULTS. Of the 138 patients, radiographic follow-up showed no change in lesion size in 101 patients (73.2%), progression in 31 (22.5%), and regression in six (4.3%). FD in immature bones progressed more often than FD in mature bones (23/34 [67.6%] vs 8/104 [7.7%], respectively; p = 0.000), and polyostotic FD had a greater chance of regressing than monostotic FD (4/39 [10.3%] vs 2/99 [2.0%]; p = 0.032). A temporal change in FD lesion opacity was noticed in a minority of patients (19/138, 13.8%). Variable changes were observed in the sclerotic rim, calcification, and trabeculation. CONCLUSION. The radiographic follow-up of FD showed that approximately a quarter of lesions changed in size over time. Regardless of the change in lesion size, opacity and several morphologic features of FD changed during the follow-up period, which might reflect the histopathologic evolution of FD.

O Cripto-1 é um potencial biomarcador para o diagnóstico diferencial dos tumores ósseos benignos e malignos dos maxilares / Cripto-1 is a potential biomarker for the differential diagnosis of benign and malignant jaw bone tumors

O termo lesão fibro-óssea dos maxilares (LFOM) é uma designação inespecífica para um grupo de distúrbios caracterizados, morfologicamente, pela substituição do tecido ósseo por uma matriz de tecido conjuntivo fibrosa, a qual exibe neoformação de tecido ósseo com diferentes graus de mineralização. O diagnóstico preciso das LFOM não é fácil e só pode ser realizado após uma análise minuciosa dos aspectos clínicos, radiológicos e histológicos. No entanto, deve-se admitir que alguns casos desafiam a exatidão na emissão do diagnóstico. Considerando a diversidade do comportamento biológico das lesões e as pesquisas sobre a identificação de potenciais marcadores moleculares, o objetivo deste trabalho foi realizar uma análise imunohistoquímica do cripto-1 (CR-1) e da ß-catenina em uma série de casos diagnosticados microscopicamente como displasia fibrosa (DF) (n=30), fibroma ossificante central (FOC) (n=28) e osteossarcoma (OS) (n=5) armazenados nos arquivos do Serviço de Anatomia Patológica Oral de uma população brasileira. As expressões imuno-histoquímicas foram analisadas através de escore imunorreativo. Os dados obtidos foram inseridos em um arquivo do software Microsoft Excel® e, posteriormente, analisados no software Statistical Package for Social Science. Para todos os testes estatísticos utilizados, o nível de significância foi estabelecido em 5% (p<0,05). O CR-1 exibiu predominância de um padrão fortemente positivo para os casos de FOC e OS, e do padrão moderado para os casos de DF (p<0,001). A ß-catenina exibiu predominância do padrão negativo para os casos de FOC e DF, e do padrão fortemente positivo para os casos de OS (p=0,001). O teste de correlação de Spearman revelou correlação positiva entre os escores imunorreativos de CR-1 e ß-catenina. Os resultados desta pesquisa sugerem a participação do CR-1 na patogênese do FOC e OS, assim como o uso dessa proteína como potencial biomarcador molecular para o diagnóstico diferencial de LFOM (AU).

Fibro-osseous lesions of maxilar (FOLM) is a non-specific designation for a group of disorders characterized, morphologically, by replacement of bone tissue by a matrix of fibrous connective tissue, showing neoformation of bone tissue with varying degrees of mineralization. Precise diagnosis of FOLM is not easy, and requires careful analyisis of clinical, radiological and histological aspects. Even so, some cases still challenge accuracy in diagnosis. Considering the diversity of biological behaviour of the lesions and the research regarding identification of potential molecular markers, this study aims to perform immunohistochemical analysis of crypto-1 and ß-catenin in a series of cases diagnosed microscopically as fibrous dysplasia (FD) (n=30), central ossifying fibroma (COF) (n=28) and osteossarcoma (OS) (n=5), stored in archives of Oral Pathological Anatomy Service of a Brazilian population. Immunohistochemical expressions were analysed by imunorreactive score. All data obtained was inserted into a file of Microsoft Excel® software (Microsoft Corporation, USA) and then transferred to a database of SPSS® for Windows software (Statistical Package for Social Sciences; IBM, USA), version 20.0. For all statistical tests used, the significance level established was p ≤ 0.05. CR-1 showed a predominant pattern of strong positive in COF and OS cases, and a moderate positive in FD cases (p<0,001). ß-catenin showed a predominant negative pattern for COF and FD cases, and a predominant strong positive pattern for OS cases (p=0,001). Spearman correlation tests showed positive correlation of the imunoreative scores of CR-1 and ß-catenin. Those results suggests CR-1 could be involved in the pathogenesis of COF and OS, and this protein could be used as a potential molecular biomarker for diferential diagnosis of FOLM (AU).

Monostotic fibrous dysplasia at C7 treated with vertebroplasty: a case report and review of the literature.

BACKGROUND: Monostotic fibrous dysplasia (MFD) involving the spine is rare, and the treatment options are controversial. Surgery is needed when patients suffer from persistent pain, spinal cord compression/injury, and vertebral collapse/instability. Treatment methods include biopsy/observation, corpectomy with instrumented fusion, posterior fusion, vertebroplasty (VP), curettage and bone graft, and complete removal of the vertebra with a combined anterior and posterior fusion procedure. CASE PRESENTATION: The patient was a 56-year-old woman with a 2-year history of neck pain. No obvious abnormalities were detected on neurological or physical examination, and laboratory findings were all within normal limits. An imaging examination suggested a C7 vertebral bone tumor. The patient refused to continue conservative observation treatment and requested surgery. Open VP of the C7 vertebral body was carried out, and her postoperative neck pain was completely relieved. The postoperative pathological results supported the diagnosis of fibrous dysplasia, and the patient was ultimately diagnosed with MFD. At the 12-month follow-up visit, the patient reported no clinical symptoms, and no signs of tumor recurrence were detected. CONCLUSION: VP can relieve pain while stabilizing the spine. Thus, the surgical treatment of MFD vertebral lesions by VP is a valuable option.

Monostotic craniofacial fibrous dysplasia: report of two cases with interesting histology

Fibrous dysplasia (FD) is a relatively rare osseous disease of unknown etiology, wherein the normal bone is replaced by collagen-rich tissue, comprising of fibroblasts and variably abundant immature woven bone. Clinically, it may involve a single bone or multiple bones. It commonly arises in the jaw bone, skull, rib, and proximal femur. Those arising in the skull and the jaw are together termed "craniofacial fibrous dysplasia." The differential diagnosis at this location includes meningioma and metastatic carcinoma. In this report, we highlight two diagnostically challenging cases presenting with orbital swelling and headache as the main complaints. Our first case was misinterpreted as meningioma on intraoperative squash smear, and paraffin sections revealed characteristic features of FD. The second case highlights the morphological feature of non-specific cystic degeneration occurring in FD. Radiographs in such cases show cystic swelling, which is indicative of a secondary aneurysmal bone cyst.

Ulnar focal cortical indentation: a progressive, deforming variant of focal fibrocartilaginous dysplasia.

BACKGROUND: Focal fibrocartilaginous dysplasia is a rare growth disturbance of bone resulting in deformity. In the ulna, focal fibrocartilaginous dysplasia is particularly rare, and the characteristic fibroligamentous tether can result in progressive deformity with progressive dislocation of the radial head. The fibroligamentous tether is similar in appearance and function to the Vickers ligament seen in Madelung deformity. The imaging features of ulnar focal fibrocartilaginous dysplasia include a unilateral angular deformity in the ulna with a radiolucent cortical defect and surrounding sclerosis, with secondary radial bowing or radial head dislocation. Focal fibrocartilaginous dysplasia of the ulna has been described using the term ulnar focal cortical indentation. OBJECTIVE: To review the clinical and radiologic features of four cases of ulnar focal cortical indentation occurring in pediatric patients. MATERIALS AND METHODS: We retrospectively reviewed picture archiving and communication system and electronic medical record imaging findings with surgical correlation of ulnar focal cortical indentation at two large specialty pediatric hospitals. RESULTS: Ulnar focal cortical indentation lesions typically arise in the ulnar metaphysis and result in angular forearm deformities with progressive radial deformity including radial head dislocation. Early surgical intervention prevents progression of the deformity and retains range of motion. CONCLUSION: Ulnar focal cortical indentation, although rare, is likely a progressive form of focal fibrocartilaginous dysplasia resulting in significant deformity and disability. Early recognition of the characteristic imaging features is important for early surgical intervention to preserve range of motion and prevent radial head dislocation.

Functional and radiological outcomes of a minimally invasive surgical approach to monostotic fibrous dysplasia.

BACKGROUND: Reports showing high recurrence rates for intralesional curettage and bone grafting have made the current treatment principle for fibrous dysplasia controversial. This study aimed to report the postoperative clinical outcomes from three minimally invasive surgical strategies we use for monostotic fibrous dysplasia (MFD). PATIENTS AND METHODS: Twelve patients with MFD presenting with no pathologic fracture or deformity and treated with one of three surgical strategies-plain open biopsy, plain alpha-tricalcium phosphate (ATP) reconstruction, and prophylactic bridge plating-were included. There were nine men and three women, with median age of 38 years. Mean follow-up was 88 weeks. Five cases involved the proximal femur, two each involved the femoral and tibial diaphyses, and one each involved the distal humerus, radial diaphysis, and proximal tibia. All cases were reviewed for functional and radiological outcomes. RESULTS: Median time to full activity was 1 day (range 1 to 3) for the plain open biopsy group, while the prophylactic bridge-plating and plain ATP reconstruction groups had longer median recovery times (59 days, range 3 to 143, and 52 days, range 11 to 192, respectively). Musculoskeletal Tumor Society scores at last follow-up were excellent for all the cases (mean 29.6, range 25 to 30). Radiological analysis using Gaski et al.'s criteria showed plain open biopsy resulted in partial resolution of proximal femoral lesions, while ATP reconstruction and prophylactic plating resulted in no change and progression in this lesion site, respectively. For femoral diaphyseal lesions, prophylactic plating resulted in partial resolution, while ATP reconstruction resulted in no change. In the tibial diaphysis, prophylactic plating resulted in partial resolution, while plain open biopsy resulted in no change. For the lesions involving the distal humerus and the proximal tibia, plain open biopsy resulted in partial resolution, while for the radial diaphyseal lesion, ATP reconstruction resulted in no change. Radiological progression was limited in 11 (92%) cases, and none had postoperative complications. CONCLUSION: Plain open biopsies for asymptomatic lesions; prophylactic bridge plating for symptomatic, large diaphyseal lytic lesions; and plain ATP reconstructions for both small and large nondiaphyseal symptomatic lytic lesions may be acceptable alternatives to curettage-incorporating procedures for MFD.

Fibrous Dysplasia in the Calcaneus.

Fibrous dysplasia in the calcaneus is extremely rare; the most common locations of monostotic fibrous dysplasia of extremity bones being the proximal femoral shaft, tibia, humerus, and radius. An extensive literature search has revealed only 3 case reports that have been published concerning this topic, the most recent published in 2003. This is a case report of fibrous dysplasia in the calcaneus of a young male, including a discussion of the classical presentation of fibrous dysplasia and how this case differed. LEVELS OF EVIDENCE: Therapeutic, Level IV: Case study.

Proposal for staging of inflammatory lesions in the frontal region. / Propuesta de estadificación de las lesiones inflamatorias de la región frontal.

Frontal swelling can be due to multiple etiologies, including: mucocele, Pott's puffy tumor, fibro osseous lesions, benign and malignant neoplasms of the nose and paranasal sinuses, intracranial lesions, and metastasis. The objective of this study was to describe the clinical protocol used for the diagnosis of patients presented with frontal swelling and the proposal for staging of inflammatory lesions. We performed an observational retrospective analysis. We found 7 cases of patients with frontal swelling: 4 cases secondary to inflammatory pathology (3 Potts puffy tumors and one frontal mucocele), and 3 cases secondary to neoplasms (one benign and 2 malignant neoplasms). It's very important to consider the wide differential diagnosis that can present as frontal swelling, from inflammatory pathologies secondary to possible advanced infections of the paranasal sinuses to invasive malignant neoplasms. We propose a system of staging of frontal inflammatory lesions.

Malignant transformation in monostotic fibrous dysplasia: clinical features, imaging features, outcomes in 10 patients, and review.

Malignant transformation in fibrous dysplasia (FD) is uncommon. The purpose of this study was to investigate clinical and imaging features, and outcomes of malignant transformation in monostotic FD.Data for 10 pathologically confirmed malignant transformations in monostotic FD from January 2005 to December 2013 were retrospectively reviewed. Patient data were recorded, and radiographs (n = 10), computed tomography (CT) (n = 5), magnetic resonance (MR) (n = 4), and bone scintigrams (n = 10) were evaluated for lesion location, margin, cortical destruction, marrow involvement, periosteal reaction, and soft tissue mass by 2 musculoskeletal radiologists with agreement by consensus. Clinical features, management, and prognosis were also analyzed for each of the 10 cases.There were 8 male and 2 female patients (mean age 46.5 ±â€Š15.9 years). The affected sites were the femur (n = 4), humerus (n = 2), tibia (n = 3), and ilium (n = 1). Five cases had received previous surgery and 5 cases had no history of surgery. No patients had been given prior irradiation treatment. For the 5 cases with surgery, radiographs and CT showed purely osteolytic lesions with poor margination in the curettage area (n = 5), cortical destruction (n = 5), obvious soft tissue mass (n = 1), and mineralization (n = 2). For the 5 cases without surgery, radiographs and CT identified poorly marginated, osteolytic lesions within or near the area with "ground-glass" opacity (n = 4), cortical erosion (n = 4), and mineralization (n = 2). Magnetic resonance imaging (MRI) also identified lesions with heterogeneous signal intensity and pronounced enhancement. Bone scintigraphy revealed eccentric increased uptake of radionuclide in monostotic lesion (n = 10). Pathology reports revealed osteosarcoma (n = 7), fibrosarcoma (n = 2), and malignant fibrous histiocytoma (MFH) (n = 1). At the end of the study, 1 patient died from tumors, 1 patient was alive with lung metastasis, 1 patient experienced recurrence, and 7 patients were alive without recurrence.Patients with FD and a history of surgery should be followed up, for the osteolytic lesions in the operative areas strongly indicate the malignant transformation. The radiographic feature of FD-related malignancies is poorly marginated, mineralized, and osteolytic lesions with cortical destruction. Further investigations are needed to explore the pathogenesis of malignancies in FD and to establish optimal therapeutic strategies.

Monostotic fibrous dysplasia in the proximal tibial epiphysis: a case report.

INTRODUCTION: Fibrous dysplasia is one of many well-known disorders in which there is a defect in the remodeling process of immature bone to mature into lamellar bone, and it often exists in metaphyseal and diaphyseal parts of the long bone. In this report, we describe a rare case where fibrous dysplasia was found only in the proximal part of the epiphysis of the tibia without other bony lesions. CASE PRESENTATION: A 14-year-old Asian girl was referred to our hospital after slipping down with pain on the left knee. A radiograph showed an abnormal finding of a central radiolucent lesion with a marginal sclerotic border near the proximal tibial spine. A magnetic resonance image showed the lesion at low signal intensity on a T1-weighted image and at high signal intensity on a T2-weighted image. The biopsy results led us to conclude that the lesion was a fibrous dysplasia. CONCLUSION: If an abnormal lesion on the epiphysis, especially in long bones, is detected on a radiograph, several differential diagnoses can be made. Although fibrous dysplasia is usually not encountered as an epiphyseal lesion, it is important to incorporate all the clinical, radiographic and pathologic features to diagnose monostotic fibrous dysplasia when the lesion is located at the epiphyseal location.

En bloc resection and bone graft: does it alter the natural history of monostotic expansile fibrous dysplasia in children?

The surgical treatment of fibrous dysplasia remains a challenge for the pediatric orthopedist because of its high recurrence rate. Although a few successful treatments have been reported by using en bloc resection and bone graft in adults, this has not been reproduced in children. In this report, the authors present two children (2.5 and 6 years old) with monostotic expansile fibrous dysplasia involving the ulna and fibula, respectively, who underwent en bloc resection and autograft to replace the involved bones. Good bone union and functional recovery were obtained postoperatively. However, during a follow-up period of 8 and 5 years, respectively, the lesions recurred completely, and the deformities remained progressing over time. En bloc resection and bone graft cannot prevent recurrence in skeletally immature patients with monostotic expansile fibrous dysplasia, and cannot alter for the natural history of the disease. A combination of other management should be considered in children with fibrous dysplasia.

Monostotic fibrous dysplasia of the proximal femur: natural history and predisposing factors for disease progression.

Monostotic fibrous dysplasia of the proximal femur has a variable clinical course, despite its reported limited tendency to progress. We investigated the natural history and predisposing factors for progression of dysplasia in a group of 76 patients with a mean follow-up of 8.5 years (2.0 to 15.2). Of these, 31 (41%) presented with an asymptomatic incidental lesion while 45 (59%) presented with pain or a pathological fracture. A group of 23 patients (30%) underwent early operative treatment for pain (19: 25%) or pathological fracture (4: 5%). Of the 53 patients who were initially treated non-operatively, 45 (85%) remained asymptomatic but eight (15%) needed surgery because of pain or fracture. The progression-free survival of the observation group was 81% (sd 6.4%) at five-years follow-up. An initial presentation of pain (p < 0.001), a limp (p < 0.001), radiological evidence of microfracture (p = 0.001) and younger age (< 17 years) (p = 0.016) were significant predisposing factors for disease progression. The risk of experiencing pain or pathological fracture is considerable in monostotic fibrous dysplasia of the proximal femur. Patients presenting with pain, a limp or radiological evidence of microfracture have a high chance of needing surgical treatment.

Treatment of craniofacial fibrous dysplasia: a case report.

The concept of "fibro-osseous lesions" of bone has evolved over the last several years and now includes two mayor entities: the fibrous dysplasia (FD) and the cement-ossifying fibroma (COF). Fibrous dysplasia is considered to be a developmental, tumor-like (hamartomatous), fibro-osseous disease of unknown etiology. There is a maxillary predominance when craniofacial FD occurs in the jaws and the maxillary sinus is commonly involved. Differentiation of OF from FD is important because of differences in treatment and behaviour. This article report a case of 60-year-old female with a history of painless unilateral palatal swelling.

Monostotic fibrous dysplasia involving occipital bone: a case report and review of literature.

Fibrous dysplasia (FD) is a progressive systemic bone tumour of young and it can be seen on cranial bones. FD is divided into three types according to radiological features. The second most common subtype is polyostotic subtype. With this article, we aimed to review and present clinical features, radiological examination, differential diagnosis and treatment management of a case of solitary monostotic fibrous dysplasia of occipital bone. 15 years old female patient admitted to our hospital for a bump and in the back of his head that she noticed 1 month ago. Her physical and neurological examination was normal. On cranial CT examination we detected a bony defect. Her gadolinium enhanced cranial MRI revealed bony defect along with massive gadolinium enhancement in adjacent tissue. On histopathologic examination; PANCK, CD68, CD1a were found negative and CD45, S-100, Vimentine were found positive. Ki-67 was 4,8%. In conclusion, fibrous dysplasia is a progressive bone disease of the young patients. Despite its resemblance to a benign lesion by not being symptomatic it can progress and cause severe bony defects and skin lesions. Total surgical resection is necessary and sufficient for total treatment.