1/1659. Malignant fibrous histiocytoma and atypical fibroxanthoma in renal transplant recipients.BACKGROUND: Allograft recipients are at increased risk for skin cancer. The incidence of cutaneous squamous cell carcinoma is 50-250 times higher than in the age-matched control population, and basal cell carcinoma is about 10 times more frequent. The incidence of Kaposi's sarcoma is increased 400 to 500 times over that in a control population of the same ethnic origin. However, the incidence of other types of cutaneous sarcoma in organ allograft recipients is largely unknown. CLINICAL observation: Within a 2-year-period, we observed 2 patients with cutaneous malignant fibrous histiocytoma and 1 patient with atypical fibroxanthoma among a cohort of 642 renal transplant recipients. For comparison, the incidence for dermatofibrosarcoma protuberans which is the commonest type of cutaneous sarcoma, is 0.45/100,000 persons/year in the non-immunocompromised population. Our observation represents an incidence of 156/100,000/ year (95% confidence interval Cl 28-489/100,000/year) for cutaneous malignant fibrous histiocytoma and of 78/100,000/year (95% CI 4-368/ 100,000/year) for atypical fibroxanthoma. CONCLUSION: To our knowledge, this is the first report on an elevated incidence of cutaneous malignant fibrous histiocytoma and of atypical fibroxanthoma in renal transplant recipients. Future cohort studies on malignancies in organ allograft recipients should aim at defining this risk more exactly.- - - - - - - - - - ranking = 1keywords = cancer (Clic here for more details about this article) |
2/1659. Epithelioid cell histiocytoma: a simulant of vascular and melanocytic neoplasms.Epithelioid cell histiocytoma (ECH) is an unusual and still poorly recognized variant of benign fibrous histiocytoma. Epithelioid cell histiocytoma differs from most benign fibrous histiocytomas in five important ways: the predominance of epithelioid cells, relative lack of secondary elements (such as giant cells, foamy, or hemosiderin-laden macrophages), relative sharp circumscription, prominent vascularity, and centering in the papillary dermis in most cases. A strong resemblance to melanocytic and vascular lesions has been noted, and a recent case was reported with features suggesting endothelial origin. Fifteen new cases of ECH, including one example of the rare deep cellular variant, are presented herein, with emphasis on features mimicking vascular and melanocytic neoplasms. Labeling with endothelial markers, including previously unreported CD-31 labeling, showed abundant vascular staining, which may be challenging to interpret, but which does not indicate an endothelial origin of ECH.- - - - - - - - - - ranking = 147.07138857168keywords = neoplasm (Clic here for more details about this article) |
3/1659. Apocrine poroma: a distinctive case in a patient with nevoid basal cell carcinoma syndrome.Traditionally, poromas have been classified as eccrine neoplasms, but several recent reports of poroid tumors with sebaceous, follicular, and apocrine differentiation have challenged this idea. In support of alternative differentiation, a case of an "apocrine" poroma is reported in a 19-year-old man with the nevoid basal cell carcinoma syndrome. A papule on the right cheek, thought clinically to be a basal cell carcinoma, was excised. Anastomosing lobules of small uniform basaloid (poroid) cells formed small ductular structures lined by eosinophilic cuticles and extended into the superficial reticular dermis. The neoplasm originated from follicular infundibula and was surrounded by a myxoid stroma. Focally, primitive hair bulb and papillae differentiation was present, and some of the ducts were lined by cells suggesting decapitation secretion. The histologic pattern and the common embryologic origin of the folliculosebaceous-apocrine unit support apocrine differentiation of this tumor. The association with the nevoid basal carcinoma syndrome appears to be unique. This case, in addition, demonstrates overlapping features with the infundibulocystic type of basal cell carcinoma commonly seen in the basal cell nevus syndrome.- - - - - - - - - - ranking = 58.828555428674keywords = neoplasm (Clic here for more details about this article) |
4/1659. Basal cell carcinoma with massive ossification.We report a case of basal cell carcinoma with massive ossification in a 66-year-old white man. Ossification in various benign and malignant neoplasms have been reported including basal cell carcinomas, in which ossifications are seen in small foci or peripheral rim of the tumor. However, in our case, massive ossification is seen throughout the tumor, and only small areas of the periphery of the tumor show diagnostic histology. Therefore, this case might have presented a diagnostic difficulty or been misdiagnosed as an osteoma cutis if a smaller incisional or punch biopsy had been performed. The phenomenon of bone formation itself is not specific for any diagnostic entity, and therefore an underlying lesion should be carefully sought in case of secondary ossification.- - - - - - - - - - ranking = 29.414277714337keywords = neoplasm (Clic here for more details about this article) |
5/1659. adenocarcinoma with signet ring cells of the axilla showing apocrine features: a case report.A 74-year-old Japanese man developed a reddish, indurated plaque composed of multiple nodules on his right axilla. Histopathologic examination showed a solid tumor that extended from the upper dermis into the subcutis, with both inter- and intracellular lumen formation, cellular arrangement in single files, a fibrotic reaction around the tumor cells, and the presence of mucinous material in the cytoplasm. There was both nuclear and cytoplasmic pleomorphism. Both lysozyme and GCDFP-15 were identified in the tumor cells. Electron microscopic examination showed periluminal condensation of the cytoplasm. Because thorough clinical and laboratory examinations were unremarkable, we regarded this to be a case of primary adenocarcinoma with signet ring cells of the axilla. The neoplasm might have differentiated toward the apocrine sweat glands or the mammary glands. radiation therapy was effective to some degree. This seems to be the first reported case in which adenocarcinoma with signet ring cells of the skin affected a site other than the eyelids.- - - - - - - - - - ranking = 29.414277714337keywords = neoplasm (Clic here for more details about this article) |
6/1659. Unusually differentiating immature nerve sheath myxoma in association with dermal melanocytosis.A 44-year-old woman presented with a slightly elevated, erythematous lesion, with partially blue-black areas. The nonpigmented area histologically showed a "dissecting" fascicular growth pattern, similar to one of the patterns seen in the cellular type of nerve sheath myxoma. The clinically pigmented part of the lesion consisted of diffusely infiltrating, broad and poorly delineated fascicles often showing nerve sheath differentiation, embedded in a highly myxomatous stroma. No part of the lesion showed the plexiform pattern typical of the classic type of nerve sheath myxoma; rather, the lesion had some common features of neurofibroma, and also was characteristically associated with a considerable number of scattered dermal melanocytes. However, based on the fascicular histologic pattern showing nerve sheath differentiation within mucinous matrix, S-100 protein-negative immunophenotype, and electron microscopic features, we considered the whole lesion in the present case to be an entity within the spectrum of nerve sheath myxoma, either mixed-type nerve sheath myxoma or unusually differentiating immature nerve sheath myxoma, except for the associated dermal melanocytosis. Because of the intimate association of the dermal melanocytes with this nerve sheath myxoma with divergent differentiation, this lesion can also be considered as a distinctive type of benign neoplasm derived from pluripotent neural crest cells.- - - - - - - - - - ranking = 29.414277714337keywords = neoplasm (Clic here for more details about this article) |
7/1659. Treatment of complicated cutaneous malignant neoplasms by modern radiotherapy: principles, practice, and results.The indispensability of modern radiotherapy for certain complicated cases of cutaneous malignant neoplasms is demonstrated by a review of its principles and demonstration of results achieved by its practice in five representative cases.- - - - - - - - - - ranking = 147.07138857168keywords = neoplasm (Clic here for more details about this article) |
8/1659. A MAGE-6-encoded peptide is recognized by expanded lymphocytes infiltrating a spontaneously regressing human primary melanoma lesion.In recent years, experiments based on the in vitro stimulation of either autologous peripheral blood lymphocytes or tumor-infiltrating lymphocytes with melanoma cells have shown that distinct members of the large MAGE gene family encode tumor-associated antigenic peptides. However, little is still known about natural anti-MAGE responses in vivo. We have studied a case of spontaneously regressing human melanoma, hypothesizing that in this unique situation, the host immune system had developed an efficient cytotoxic T lymphocyte (CTL) response against the cancer cells. Amongst the dense tumor infiltrate, certain clonal populations of T cells were shown to be amplified, thereby suggesting that an antigen-driven selection had occurred at the tumor site. One of the expanded tumor-infiltrating lymphocytes was shown to be a Vbeta13 CD8 CTL displaying a strong and selective cytotoxic activity against the autologous melanoma cells. Here we show that this cytotoxic T cell clone recognizes a MAGE-6-encoded peptide. MAGE-6 is therefore the fourth gene of the MAGE family shown to encode antigenic peptide recognized by T cells. Together, these data provide further evidence that T cell responses against MAGE antigens may naturally develop in vivo.- - - - - - - - - - ranking = 1keywords = cancer (Clic here for more details about this article) |
9/1659. Angiosarcoma. A rare secondary malignancy after breast cancer treatment.life-saving mastectomy and radiation therapy are established in the treatment of early stage breast cancer. Angiosarcoma, i.e. malignant angioendothelioma, is a rare tumor which can develop after several years of such treatment. The number of post-operative and post-irradiation angiosarcomas has increased in recent years. We report four cases of angiosarcoma which occurred after treatment of breast cancer and review the literature. In two of these cases the angiosarcoma developed on the irradiated breast skin after partial mastectomy and radiation therapy, in the other two cases the angiosarcoma appeared on a chronically edematous arm after radical mastectomy and radiation therapy.- - - - - - - - - - ranking = 6keywords = cancer (Clic here for more details about this article) |
10/1659. Mohs' surgery as an approach to treatment of multiple skin cancer in rhinophyma.BACKGROUND: skin cancer arising within a rhinophyma is rare, less than would be expected from the coexisting chronic active inflammatory process. In rhinophyma, multiple coexisting tumours of different histologic types present an unusual challenge and have never been described in the literature. OBJECTIVE: The treatment approach to multiple tumours occurring in rhinophyma, utilizing Mohs' surgery, is reported and discussed. PATIENT: The case of a 64-year-old farmer with basal cell carcinoma, squamous cell carcinoma, and basosquamous carcinoma occurring in the setting of longstanding rhinophyma is described. CONCLUSION: skin cancer, especially basal and squamous cell carcinoma, diagnosed simultaneously in a rhinophyma creates a challenge; the enlarged, inflamed, and hypertrophied tissue masks their margins. In our opinion, Mohs' micrographic surgery is the treatment of choice and should be primarily considered in view of the malignant potential of these tumours, as is shown by the substantial tumour extension in the case described.- - - - - - - - - - ranking = 6keywords = cancer (Clic here for more details about this article) |
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