1/17. Subperiosteal ganglion cyst of the tibia. A communication with the knee demonstrated by delayed arthrography.We report a patient with a subperiosteal ganglion cyst of the tibia which was imaged by radiography, arthrography, CT and MRI. The images were correlated with the arthroscopic surgical and histological findings. Spiculated formation of periosteal new bone on plain radiographs led to the initial suspicion of a malignant tumour. Demonstration of the cystic nature of the tumour using cross-sectional imaging was important for the precise diagnosis. communication between the ganglion cyst and the knee was shown by a delayed arthrographic technique, and the presence of this communication was confirmed at arthroscopy and surgically.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
2/17. paresthesia and the traumatic bone cyst. Abbreviated case report.A case of a traumatic bone cyst is reported because of the unusual nature of the chief complaint. The initial symptom of the disease was mandibular nerve neuropathy with numbness of the left side of the lower lip and chin.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
3/17. Spontaneous progression of vertebral intraosseous pneumatocysts to fluid-filled cysts.Intraosseous pneumatocyst is a relatively rare condition, and its natural course is not known. We report two cases of intraosseous pneumatocyst of vertebra with resorption of gas and its replacement with fluid shown on follow-up cross-sectional imaging. The mechanism influencing the course of these appearances is unclear. However, the benign nature of intraosseous pneumatocyst needs to be recognized and biopsy avoided.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
4/17. echinococcosis granulosus/cysticus of the tibia.Hydatid disease is caused by the parasitic tapeworm echinococcus. There are three species: E. granulosus, E. alveolaris and E. voegeli. Only E. alveolaris and E. granulosus are important for human infections. These two species are totally divergent in their manner of infestation. Hydatid disease is a rare parasitic disease that primary involves the liver and the lung. Skeletal disease is rare, accounting for less than 2% of all hydatid lesions, and often presents as a clinical and radiologic diagnostic problem. The skeletal involvement is usually due to secondary extension after haematogenous spread of the infection. The vertebral column, the pelvis and the skull are most commonly involved. Treatment is also difficult because of the invasive nature of bony involvement and the spillage of fluid with subsequent contamination seeding. We present a case of primary hyatid cyst of the tibia. We point out the importance of considering osseous hydatidosis in the differential diagnosis of destructive bone lesions and the necessity of radical resection.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
5/17. A seminal vesicle cyst complicated with a tumor like nodular mass of benign proliferating prostatic tissue: a case report with ultrastructural and immunohistochemical studies.We report a seminal vesicle cyst complicated with a tumor-like nodular mass of benign proliferating prostatic tissue. The patient was a 53-year-old Japanese man. A cyst of approximately 4.5 cm in diameter was discovered at the left seminal vesicle area. In the inner part of the cyst, a papillary nodular mass of 0.7 cm in diameter was seen. Under the clinical diagnosis of a seminal vesicle cyst with a tumorous mural nodule, the patient underwent resection of the seminal vesicle cyst to rule out the possibility that the nodular mass in the cyst was a neoplasm of an especially malignant nature. Microscopic examination of the excised specimen revealed a small dome-like nodular mass on the luminal surface of the cyst consisting of nodular proliferation of benign tubular gland tissue with various configurations. Conventional histologic, immunohistochemical, and ultrastructural analysis showed the proliferating cells in the nodular mass consisted of the benign prostate type. It is extremely important to differentiate between a benign proliferation and a malignant one, when the nodular mass is found in the seminal vesicle cyst.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
6/17. Median mandibular cyst.Since the median mandibular cyst is an extremely rare lesion, there is difficulty in determining the nature and origin of this entity. An additional case of a median mandibular cyst is described and an attempt is made to clarify the confusion associated with the diagnosis of this lesion. After a review of the literature it is suggested that the median mandibular cyst is a much rarer entity than was previously believed.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
7/17. Cystic degeneration of fibrous dysplasia masquerading as sarcoma.An area of fibrous dysplasia of bone may undergo rapid enlargement which may be due to either cystic degeneration or malignant transformation. These complications may be clinically and radiologically indistinguishable and, unless both are borne in mind, incorrect management may follow. magnetic resonance imaging was used in one of our cases and was the only imaging modality to demonstrate the true nature of the condition.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
8/17. Mimickry in osteogenic sarcoma. Clinical considerations and report of 2 cases.The authors report two cases of osteogenic sarcoma which presented under the false diagnosis of aneurysmal bone cyst and benign fibrous histiocytoma respectively. This mimickry is discussed: a) It is certainly more common than would appear from the literature, particularly in the case of aneurysmal bone cyst; b) this mimickry applies particularly to the lytic type of osteosarcoma; c) the adjective telangiectatic which is often used to describe malignant bone aneurysms is equivocal; d) immature forms of osteogenic sarcoma all possess a common factor with regard to onset, course and outcome of the disease; e) microscopic anaplastic elements may not always be observed in these imitations; f) clinical examination may often achieve or at least get closer to a true diagnosis of the disease: it is necessary to be aware of the existence of mimetic forms of osteogenic sarcoma and carefully evaluate all the available information; g) surgery should be delayed where clinical doubt exists and the histological report is negative. Such a delay may allow the tumour to reveal its true nature so that the surgeon and oncologist can select the correct treatment.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
9/17. The 'hybrid' fibro-osseous lesion.A hitherto unreported 'hybrid' fibro-osseous lesion involving the nasal cavity and sinuses is reported. This lesion histologically demonstrated features of ossifying fibroma, cementifying fibroma and aneurysmal cyst. Whilst appearing benign in nature it behaved in a neoplastic manner which necessitated complete surgical excision. A combined clinical, radiological and histopathological approach is advocated and discussed in relation to the treatment of these lesions.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
10/17. Cementum-like bone production in solitary bone cysts. (so-called "cementoma" of long bones). Report of three cases. Electron microscopic observations supporting a synovial origin to the simple bone cyst.Three cases of simple bone cysts (S.B.C) in association with cementum-like bone production are reported. Analysis of our cases and the 2 previously reported in the literature as so-called cementomas has led us to conclude that the "cementoma" of long bone is not a distinct entity, but merely, a form of S.B.C. associated with a peculiar, poorly cellular form of bone which mimics tooth cementum by light microscopy only. Electron microscopic studies of this substance demonstrate collagen fibers and numerous matrix vesicles which form the initial sites of calcification. Matrix vesicles are a product of osteoblastic activity and are never found in the cementum of the tooth or oral cementum producing tumors. We also report the first ultramiscroscopic observations on the wall of the simple bone cyst and its lining. Two cell types constitute the lining, having features identical to those described for type A and type B synovial cells. Because of this new observation, we believe, the most reasonable explanation for the simple bone cyst is that it represents a congenital "rest" of synovial tissue displaced into the thin, cortical metaphyseal region of bones at the synovial-capsularbone reflection. Its benign nature and slow growth would explain its discovery in early childhood and the marked preponderance of its proximal humerofemoral location dependent upon the fact that these 2 bones have the largest area of capsular to metaphyseal bone reflection.- - - - - - - - - - ranking = 1keywords = nature (Clic here for more details about this article) |
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