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Query: UMLS:C0027627 (metastases)
 103,950 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Three cases of small cell neuroendocrine carcinoma of the urinary bladder were studied by light and electron microscopic techniques. Dense-core, membrane-bound granules were identified in the cytoplasm of all 3 cases, substantiating the light microscopic impression of a morphologic similarity to other neuroendocrine carcinomas, such as small cell (oat cell) carcinoma of the lung. Two of the three cases showed clinical evidence of distant metastases, suggesting an aggressive biologic potential of this tumor similar to oat cell carcinoma of the lung. A partial remission was induced in these 2 cases using chemotherapy protocols similar to the drug regimens for small cell (oat cell) carcinomas of the lung. Recognition of this distinct entity has important clinical implications regarding therapeutic approach.
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PMID:Small cell neuroendocrine carcinoma of the urinary bladder: report of three cases with ultrastructural analysis. 630 62

A case of malignant eccrine poroma with lymph node metastases is described. The patient had a nodular growth of the right thigh 2 years before its first excision. Local recurrence in the scar occurred in 6 months, and by 8 months a right groin lymph node was involved. Subsequent skin nodules of the right thigh occurred over the next 12 months, associated with recurrent lymphedema of the leg. During several follow-up visits, associated malignancies were found including villous adenoma of the ascending colon and renal cell carcinoma of the right kidney, both typical histologically and unrelated to the cutaneous tumor. Subsequently, left inguinal lymph node disease histologically identical to the skin tumor was found. Clinical and histologic findings were similar to the 31 previous cases reviewed. Electron microscopic examination confirmed the presence of a ductal structure consistent with eccrine duct and a crystalline membrane-bound granule which may represent a specific marker for this rare tumor. The histologic features of this tumor are important to separate from other differential diagnostic possibilities which may have a quite different prognosis.
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PMID:Malignant eccrine poroma. Case report and review of the literature. 632 Oct 10

The authors describe the clinical and histologic findings in a case of Merkel cell carcinoma of the vulva, which was associated with squamous cell carcinoma in situ and lichen sclerosus. Electron microscopy of the tumor revealed membrane-bound granules. At postmortem examination, metastases from this primary skin tumor were found in the pelvic lymph nodes, in paraortic lymph nodes, in the liver, and in vertebral bodies. The case is unusual because Merkel cell tumors are usually found on the face or the extremities and seldom metastasize widely.
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PMID:Merkel cell carcinoma of the vulva. 632 75

High-resolution proton nuclear magnetic resonance (NMR) studies of intact cancer cells revealed differences between cells with the capacity to metastasize and those that produce locally invasive tumors. The NMR resonances that characterize the metastatic cells were associated with an increased ratio of cholesterol to phospholipid and an increased amount of plasma membrane-bound cholesterol ester. High-resolution NMR spectroscopy could therefore be used to assess the metastatic potential of primary tumors.
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PMID:High-resolution proton nuclear magnetic resonance analysis of metastatic cancer cells. 650 99

We present the first case report of an olfactory neuroblastoma (esthesioneuroblastoma) diagnosed by cytologic examination. The patient was a 40-year-old male who had a 13-year history of "adenocarcinoma" of the nasal cavity until the correct diagnosis of olfactory neuroblastoma was made cytologically from pleural fluid shortly before his death. The cells had the typical features of rosette formation, scanty elongated cytoplasm, clustering of cells and nuclear compression resulting in an "onion-skin" appearance. Surgical specimens, several biopsies and fine needle aspiration of a metastatic deposit in a lymph node all showed, retrospectively, features of esthesioneuroblastoma. Electron microscopy showed membrane-bound dense-core secretory granules. Autopsy findings revealed multiple metastases but no tumor at the original site; that tumor had been treated with high-dose radiation therapy as well as systemic chemotherapy. Olfactory neuroblastoma is a rare tumor, but it is important to recognize because it has a better prognosis than the more commonly encountered malignancies of the nose.
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PMID:Cytologic diagnosis of olfactory neuroblastoma. Report of a case with multiple diagnostic parameters. 657 48

The Merkel cell is a distinctive nondendritic, nonkeratinocytic, epithelial clear cell believed to migrate from the neural crest to the epidermis and dermis, which is usually located in or near the basal layer of the epidermis and associated with nerve terminations. Merkel first described these cells in 1875 as "Tastzellen" occurring in the snout of a mole. They are believed to function as slowly adapting mechanoreceptors that mediate the sense of touch. Tumors arising from Merkel cells have been reported to occur on the head and neck area, the trunk, arms, and legs, and resemble a primary cutaneous lymphoma or cutaneous metastasis of a lymphoma or a carcinoma. Electron microscopy, to locate the characteristic membrane-bound, dense core neurosecretory granules, is needed for accurate diagnosis. These tumors must be treated aggressively to minimize the chance of local recurrence and nodal or visceral metastases. The authors present a case of Merkel cell tumor occurring on the eyelid. The clinical history, light and electron microscopic findings are shown.
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PMID:A Merkel cell tumor of the eyelid. 667 39

Pulmonary metastases from a carotid body paraganglioma developed in a patient with von Hippel-Lindau disease. On electron microscopic examination, these metastases consisted solely of chief cells that contained membrane-bound, dense-core granules and formed numerous cytoplasmic processes. These data support the hypothesis that the chief cell is the sole neoplastic cell in paragangliomas. Finally, to our knowledge, this clinical association of a malignant carotid body paraganglioma and pheochromocytoma in von Hippel-Lindau disease is unique.
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PMID:Metastatic carotid body paraganglioma in von Hippel-Lindau disease. An electron microscopic study. 689 35

Two patients with small-cell undifferentiated neuroepithelial tumors of skin are reported. The histologic and ultrastructural features of this neoplasm are presented. Characteristic membrane-bound, dense-core neurosecretory granules were seen in the cytoplasm of the tumor cells in both cases. The literature is reviewed in regard to the clinical behavior of these lesions and their possible cell of origin. Dermatologists should be aware of these tumors because they may require electron microscopy for accurate diagnosis. The tumors should be treated aggressively to minimize the chance of local recurrence and nodal or visceral metastases.
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PMID:Small-cell neuroepithelial tumor of skin: a Merkel-cell neoplasm? 706 51

This is a clinicopathologic study of 17 cases of alveolar soft-part sarcoma of the orbit. The mean age of patients was 23 and the median was 18 (range, 11 months to 69 years); 13 patients (76.5 per cent) were women and four were men (ratio, 3.25:1). The right and left orbits were equally involved (eight patients each), and in one the laterality was not specified. Histologically, the tumors had a distinctive organoid pattern outlined by thin-walled capillaries and were composed of nests of large polyhedral cells with abundant, finely granular, acidophilic cytoplasm. Approximately two thirds of the tumors had diagnostic PAS-positive diastase-resistant crystalline structures. Histologically, the differential diagnosis included nonchromaffin paraganglioma, granular cell tumor, metastatic renal cell carcinoma, vascular tumor, alveolar rhabdomyosarcoma, and amelanotic malignant melanoma. Electron microscopic studies of one tumor disclosed mitochondria with abnormal cristae, increased amounts of glycogen, and cytoplasmic crystalline structures with a periodicity of 8 to 10 nm. Smaller membrane-bound electron-dense granules appeared to be precursors of the crystals. Follow-up studies showed that eight patients were alive and well (median follow-up period, 11.4 years). Six of the eight patients at the time of diagnosis were 20 years of age or younger. A ninth patient was alive and well 13 years after excision of the orbital mass and four years after bilateral thoracotomy with resection of nine pulmonary nodules. Two patients died as a result of metastatic disease, one 14 years and the other 21 years after initial orbital surgery. Two patients died of other causes, one of whom had pulmonary metastases at autopsy. The follow-up period on two recent cases was less than three years, and two patients were lost to follow-up. The disease pursued an indolent clinical course. Surgery offers the best chance to control the disease.
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PMID:Alveolar soft-part sarcoma of the orbit: a clinicopathologic analysis of seventeen cases and a review of the literature. 707 38

Neuroendocrine (Merkel cell) carcinoma of the skin is usually a tumor found in elderly individuals. Microscopically, the tumor is a small cell carcinoma that involves primarily the dermis. The dominant ultrastructural features are the presence of short cell processes containing small, dense-core, membrane-bound granules. The tumor is often locally aggressive, has the potential to metastasize to lymph nodes, and eventually causes death. The authors report a case of such a neoplasm that affected a 24-year-old man with congenital ectodermal dysplasia. It was associated with a concurrent basal cell carcinoma.
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PMID:Neuroendocrine carcinoma of the skin in a young adult. 713 24


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