Search results for " Benign Fibrous"
showing 10 items of 10 documents
CD99 Immunoreactivity in Atypical Fibroxanthoma
2002
Atypical fibroxanthoma (AFX), a pleomorphic superficial cutaneous tumor of low-grade malignancy, shares many morphologic features with malignant melanoma (MM) and squamous cell carcinoma (SCC). Absence of S-100, keratin, and desmin immunoreactivity is the clue for this diagnosis. In a search for positive markers, we tested 26 cases of AFX with 2 antibodies: O13 (CD99) and protein gene product 9.5 (PGP9.5). We also included 10 cases of poorly differentiated SCC and 10 cases of MM in the study. In AFX, CD99 immunoreactivity was present in 19 cases (73%), whereas focal PGP9.5 immunoreactivity was found in only 9 cases (35%). None of the SCC cases showed CD99 immunostaining. No CD99 immunoreact…
Operative management of epidural tumors of the spine
1994
Seventy-two patients with neoplastic involvement of the vertebral column were operated on between 1986 and 1991. In the course of 79 operations anterior decompression and stabilization alone were performed in 3 cases, while ventrodorsal spondylodesis was carried out in 10 individuals. The remainder of the patients underwent exclusively dorsal decompression and stabilization, mainly with the Cotrel-Dubousset instrumentation (CDI). No external spinal support was required following posterior fixation by CDI alone or in combination with ventral spondylodesis. Forty patients suffered from neurological deficits preoperatively, 20 of them being unable to walk, in most cases owing to severe vertebr…
Malignant fibrous histiocytoma of the renal capsule
1981
We report about an extremely rare case of malignant fibrous histiocytoma (MFH) of the renal capsule. The tumor is composed of fibroblast-like cells arranged in a storiform pattern and histiocyte-like cells with multinucleated giant cells, both showing no iron reaction. Characteristic of the histiocytic quality of the tumor are numerous PAS-positive intracytoplasmic droplets which can be identified as erythrophagosomes only under the electron microscope. Emphasis is put on the preoperative differential diagnosis of the tumor from renal cell carcinoma as well as on its histogenesis and prognosis.
In regard to “A tale of two clones: Caldesmon staining in the differentiation of cutaneous spindle-cell neoplasms”
2018
Value of nude mice xenografts in the expression of cell heterogeneity of human sarcomas of bone and soft tissue.
1988
Summary Nude mice xenotransplants have been performed on human primary sarcomas of bone and soft tissues in order to delve into the cell heterogeneity of these neoplasms. Particular emphasis has been given to the group of small round blue cell sarcomas (Ewing's sarcomas and peripheral neuroectodermal tumors). Out of 31 xenotransplanted sarcomas, 16 cases have grown positively, and many of them continue to be transferred into nude mice on a regular time basis, being presently considered as fully established nude lines. Here we report the results of such a system, which has been followed with optical, electron microscopical, immunohistochemical and cytogenetic techniques. Osteosarcomas make u…
h-caldesmon immunoreactivity in atypical fibroxanthoma: implications for the differential diagnosis.
2017
FU-3 monoclonal antibody: a specific marker for malignant fibrous histiocytoma? An analysis of 32 malignant soft tissue and bone sarcomas.
1994
An immunohistochemical study on frozen sections was carried out on 51 malignant tumours of soft tissue and bone using the FU-3 monoclonal antibody. This antibody is claimed to be specific for malignant fibrous histiocytoma (MFH) and liposarcoma and for normal and tumour cells located in perivascular fields. The results show a lack of specificity in MFH staining: several malignant tumours such as synovial sarcoma, fibrosarcoma, rhabdomyosarcoma, osteogenic sarcoma, and including an anaplastic malignant melanoma, presented positive staining somewhat similar to that found in MFH. The value of this antibody in the differential diagnosis of MFH is doubtful. It might be useful to recognize a comm…
Nonepithelial skin tumors with multinucleated giant cells
2013
Recognition of the different types of multinucleated giant cells in neoplastic and pseudotumoral lesions of the skin may be helpful in the differential diagnosis of these tumors. In this review, we will analyze the different types of multinucleated giant cells that can be found in nonepithelial cutaneous tumors and, more importantly, the clinicopathological context in which they are found. Touton giant cells are typically present in juvenile xanthogranuloma, necrobiotic xanthogranuloma, and some subtypes of xanthomas. Giant cells with a ground glass appearance are typically present in the solitary reticulohistiocytoma and multicentric reticulohistiocytosis. Osteoclast-like cells are found i…
Analysis of p53 and mdm2 proteins in malignant fibrous histiocytoma in absence of gene alteration: prognostic significance.
2000
TP53 and MDM2 genes and their protein expression were evaluated in frozen and paraffin-embedded tissue from 27 patients with malignant fibrous histiocytoma to elucidate the relationship between them, their implication in tumor progression mechanisms and their possible diagnostic-prognostic value in malignant fibrous histiocytoma. Single-strand conformation polymorphism analysis and direct sequencing of polymerase chain reaction-amplified DNA were used to establish two TP53 mutations (7.4%): a point mutation and a 63-bp duplication. Amplification of the MDM2 gene was observed in two tumors (7.4%) by means of Southern-blot analysis, one of them also carrying the TP53 point mutation. Immunohis…
The Man Behind the Eponym: Hans Biberstein and Follicular Hyperplasia Overlying Dermatofibroma
2009
Hans Biberstein first described the basaloid follicular hyperplasia overlying dermatofibromas in 1923 and published his extensive observations on the subject in 1931. Part of Josef Jadassohn's department in Breslau, he was forced to leave German by the National Socialist regime and spent the rest of his career in New York. After a hiatus of 30 years, the dermatopathologic literature once again began addressing his seminal finding but never gave him proper credit. We suggest Biberstein's sign as an appropriate term for basaloid follicular hyperplasia overlying a dermatofibroma and as a small tribute to a pioneer dermatopathologist.