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Biomedical subjects

T F Warner

Publications and source records attributed to T F Warner.

At least 73 records · Page 4Linked to original sources

Glucagonomas. Ultrastructure and immunocytochemistry.

Pancreatic tumors harboring glucagon immunoreactive cells were found in four patients with diabetes mellitus. Alpha-cell (glucagon) granules were present in three tumors; pancreatic polypeptide (PP) immunoreactive cells were detected in two. In two patients the tumors were malignant and one of these had the glucagonoma syndrome; the other was a member of a family with MEN-type I syndrome. These cases illustrate three clinical subtypes of glucagonoma.

Adenoma, Islet Cell↗

Malignant nerve sheath tumor containing endocrine cells.

A malignant nerve sheath tumor occurred in the thigh of a 29-year-old man who had the stigmata of von Recklinghausen's neurofibromatosis. Chondroid foci, rhabdomyoblasts, and mucus-containing acini were identified in the tumor. Argyrophil cells and somatostatin-immunoreactive cells were present in acinar epithelium. Endocrine type granules were found in epithelial cells on ultrastructural examination. This is an example of a so-called "glandular schwannoma" and is unique in that it contained somatostatin-immunoreactive cells. A neural crest derivation is suggested for this complex tumor.

Adult↗

Acral lentiginous melanoma simulating "clear cell sarcoma of tendon and aponeuroses".

Clear cell sarcoma was closely mimicked in metastatic tumor deposits from two patients with acral lentiginous malignant melanoma. A subcutaneous deposit composed of glycogen-laden spindle cells dominated the presenting clinical picture in one patient. In the other, primary acral melanoma resembled a histiocytic tumor and metastatic tumor simulated clear cell sarcoma. The cases illustrate the pleomorphism that may be encountered in malignant melanoma.

Adult↗

Increased mitochondrial glycerol phosphate dehydrogenase activity in insulinomas of two hypoglycemic infants.

The activities of flavin-linked, mitochondrial glycerol phosphate dehydrogenase in islet cell adenomas from two infants were 8 and 16 times higher than those in their uninvolved pancreases. The enzyme in the insulinomas, but not that in the nearby pancreases, was inhibited by diazoxide, which is a known inhibitor of insulin secretion in vitro and in vivo. These results provide preliminary evidence that the enzyme may be used as an adjunct to histology for identifying human insulin-secreting tissues. Its sensitivity to diazoxide adds specificity to the test. Taken together with previous work with animal pancreatic islets, the results of the present study suggest that the glycerol phosphate shuttle plays an important role in stimulus-secretion coupling in the pancreatic beta-cell.

Adenoma, Islet Cell↗

Neurotropic melanoma of the vulva.

A spindle cell melanoma of the clitoris was associated with a large area of lentiginous melanocytic dysplasia in the vulva of a 51-year-old woman. There was extensive neoplastic of the dermis, a desmoplastic reaction, and replacement of perineurial and Schwann cells by tumor cells (neurotropism). The superficial dysplastic components were pigmented, but melanosomes were not identified in a lymph node metastasis. Here the internuclear areas strongly resembled neuropil. Vulvar melanoma is rate, and this is the first report of neurotropic melanoma in this site.

Cell Nucleus↗

A combined morphologic and immunologic approach to the diagnosis of gastrointestinal lymphomas: I. Malignant lymphoma of the stomach (a clinicopathologic study of 22 cases).

Twenty-two cases of primary gastric non-Hodgkin's lymphoma, which occurred over a 20-year period, were reviewed. Eighteen tumors were studied using an immunoperoxidase method, and the presence of intracytoplasmic monoclonal immunoglobulin (Ig) in nine (50%) suggested a B-cell origin. Four tumors (22%) contained intracytoplasmic muramidase (lysozyme), suggesting a true histiocytic origin. Five tumors (28%) did not contain immunoglobulin or muramidase. The muramidase-positive "true histiocytic lymphoma" could not be differentiated from histiocytic lymphoma of lymphocytic origin using light microscopic examination alone. The patients with B-cell lymphoma survived significantly longer than patients in the other two groups. The differentiation between true histiocytic lymphoma and other conditions is discussed.

Aged↗

Giant melanosomes in the B-K mole syndrome.

Giant melanosomes were identified in lentigines and nevi of 4 patients from 3 kindreds with the B-K mole syndrome. They were present in some dysplastic lesions but not in malignant melanomas. In one case examined in the electron microscope, characteristic ultrastructural features were observed.

Adult↗

Langerhans' cell tumor of the eyelid.

Light microscopic examination of a cutaneous nodule excised from the eyelid of a 35 year-old woman showed a monotonous proliferation of histiocytes with pagetoid infiltration of the epidermis. Following excision of this lesion, ipsilateral cervical lympadenopathy was noted. An infiltrate of cytologically similar cells was found. Electron microscopic examination showed features of Langerhans' cells including typical Birbeck granules in tumor cells from the lymph nodes. It is suggested that this localized neoplasm originated in the skin and metastasized to the regional lymph nodes.

Adult↗

Toxic shock syndrome: management and long-term sequelae.

Little information is available on the optimal management of toxic shock syndrome and on its sequelae. The most appropriate antibiotic treatment, the efficacy of colloid infusions, and the potential role of gamma globulin preparations have not yet been completely ascertained. Coagulase-positive staphylococci associated with toxic shock syndrome had minimal inhibitory concentrations of 0.06 microgram/mL or less to rifampin, 0.25 microgram/mL or less to gentamicin, and 0.50 microgram/mL or less to both nafcillin and clindamycin. In the 36 patients studied abnormal chest roentgenograms were commoner in those who had received albumin than in those who had not. Radioimmunoassay showed antibody titers to staphylococcal enterotoxin F, a marker protein in toxic shock syndrome, of 1:4000 or more for intravenous gamma globulin (12/15 lots) and 1:40 000 or more for intramuscular gamma globulin. Major sequelae of toxic shock syndrome include late-onset rash, compromised renal function, cyanotic extremities, and prolonged neuromuscular abnormalities.

Adolescent↗

Plasmacytomas in rhesus monkeys.

Plasmacytomas were found in two adult male rhesus monkeys. Involvement of vertebral bone marrow, skin, kidney, and soft tissues was present in one case and infiltration of the stomach, lymph nodes, and retroperitoneum in the other. Both tumors were seen to be typical plasmacytomas by light and electron microscopy. Strong IgA immunoreactivity was demonstrated in the tumor cells of one case and weak reactivity in the other using rabbit anti-human immunoglobulin sera and the immunoperoxidase technique. Also, IgA was demonstrated in tumor extracts and in the serum of one case.

Animals↗

Pseudo-Gaucher cell in IgMk plasmacytoid lymphoma.

Cells resembling those of Gaucher's disease were found on imprints of a lymph node from a patient with a plasmacytoid lymphoma. These cells contained nonspecific esterase, and electron-dense crystal-like structures. Associated plasma cells stained positively with anti-kappa and anti-mu sera but few macrophages were stained. The resemblance of these macrophages to Gaucher cells was due to the crystal-like inclusions that probably represented altered immunoglobulin.

Cytoplasm↗

Schwann cell features in neurotropic melanoma.

Schwann cell features were found on ultrastructural examination of a neurotropic melanoma (de novo type) of the lip. A neurotropic pattern of growth was retained in metastatic tumors in lymph nodes and lung. Melanin was not demonstrable in extra-epidermal tumor cells.

Adult↗

Islet cell adenomatosis: a report of two cases and review of the literature.

Two cases of nesidioblastosis in infants with severe neonatal hypoglycemia were studied by immunocytochemical staining and electron microscopic examination of the resected pancreata. There was a diffuse proliferation of insulin-, glucagon-, and somatostatin-producing cells in both cases. A 0.6-cm adenoma present in one cases consisted of insulin-, glucagon-, and somatostatin-producing cells in close proximity to ductal cells. Pancreatic polypeptides-producing cells were also identified by electron microscopy. These findings indicate that some adenomas consist of mixed islet cell types, although severe hypoglycemia is usually the major initial symptom.

Adenoma, Islet Cell↗