Biomedical subjects

D C Snover

Publications and source records attributed to D C Snover.

99 records · Page 6Linked to original sources

PubMed1981

Mitotic activity in benign parathyroid disease.

Tissue sections from 17 cases of parathyroid adenoma and ten cases of parathyroid hyperplasia were examined for mitotic activity. Mitoses were identified in 12 of the 17 cases of parathyroid adenoma and in eight of the ten cases of parathyroid hyperplasia. Clinical follow-up of all patients, even the four patients in whom numerous mitoses were present, showed no evidence of recurrent or aggressive disease. Mitotic activity alone is an unreliable indicator of aggressive potential in parathyroid disease.

Adenoma↗

PubMed1981

Reactive fibrohistiocytic proliferation simulating fibrous histiocytoma.

A pelvic nodule was excised at the time of reexploration of the abdomen in a 32-year-old women who had previously had a malignant germ cell tumor with a mixed histologic pattern of the right ovary. The 3-cm firm lesion from the right vaginal apex was composed predominantly of spindle cells with a prominent storiform pattern. Some findings, such as the presence of foamy histiocytes and a focal foreign body reaction with polarizable material, were atypical for a lesion otherwise quite acceptable histologically as a fibrous histiocytoma. Ultrastructural findings also tended to support the reactive rather than neoplastic nature of this mass. There is a similarity to the silica reaction described by Weiss and co-workers (Cancer 42:2738-2743, 1978).

Adult↗

PubMed1981

'Pseudolymphoma'. A case associated with primary immunodeficiency disease and polyglandular failure syndrome.

An atypical lymphoproliferative process occurred in the liver and spleen of a child with combined immunodeficiency disease and polyglandular failure syndrome. The initial pathologic interpretation was that of malignant lymphoma, although the child's subsequent clinical course was complicated by rheumatoid arthritis, thyroiditis, and chronic active hepatitis, with no clear evidence of lymphoid neoplasia. This case illustrates that unusual lymphoid proliferations in patients with immunodeficiencies may simulate malignant lymphoma.

Adolescent↗

PubMed1980

Biological and histological characteristics of simultaneous bilateral breast cancer.

Biological and histological characteristics of simultaneous bilateral breast cancers were studied in 11 patients: 8 had bilateral oestrogen receptor (ER)-positive tumours, 2 had bilateral ER-negative tumours; and only 1 case was asymmetric in receptor status. In contrast 5 of 7 asynchronous bilateral tumours demonstrated disparity in receptor status. The high incidence of bilateral positivity and similarity of receptor content in the simultaneous group suggests that the development of this group of tumours is probably hormonally related. Furthermore, the inverse relationship between tumour size and receptor content suggests an alteration in tumour characteristics during tumour progression.

Adenocarcinoma, Mucinous↗

PubMedDate not supplied

Hepatic graft versus host disease: a study of the predictive value of liver biopsy in diagnosis.

Ninety-six liver biopsies [32 bone marrow transplant (BMT), 7 pre-BMT, and 57 non-BMT] are reviewed for histological evidence of graft versus host disease (GVHD), based on bile duct atypia and related inflammatory changes. In addition, the presence of cholestasis, piecemeal necrosis, and attachment of lymphocytes to vascular endothelium (endothelialitis) are evaluated. The 57 non-BMT biopsies include examples of viral hepatitis (acute and chronic), nonviral chronic hepatitis, extrahepatic biliary obstruction, cytomegalovirus hepatitis, primary biliary cirrhosis, and orthotopic liver transplant rejection. Although the sensitivity of bile duct damage as an indicator of GVHD appears high (only one probable false negative was noted), there is considerable overlap between the changes of GVHD and occasional cases of acute and chronic hepatitis and extrahepatic biliary obstruction. Nine of the 57 non-BMT biopsies (15%) were felt to be consistent with GVHD and represent "false positives". Despite this relative lack of specificity, analysis of several features in combination provided clues to improve accuracy of diagnosis. The findings of extensive bile duct damage with minimal inflammatory changes is characteristic of GVHD. Possibly more predictive is the presence of endothelialitis of portal or central veins, which was seen in only three non-BMT biopsies, being present in eight cases of GVHD.

Adolescent↗

PubMedDate not supplied

Liver disease in cytomegalovirus mononucleosis: a light microscopical and immunoperoxidase study of six cases.

Six liver biopsies from previously healthy adult patients with cytomegalovirus (CMV) mononucleosis were studied by routine light microscopy and by the immunoperoxidase technique for CMV antigen. Light microscopical findings consisting of a mononuclear portal and sinusoidal infiltrate, increased hepatocellular mitotic activity and minimal hepatocellular necrosis were consistently found. Less common features were granuloma formation and bile duct epithelial damage. Typical CMV nuclear inclusions and CMV antigen were identified in only one case, a patient with marked leukopenia secondary to CMV who had received corticosteroid therapy. The other five cases contained no inclusions and CMV antigen could not be identified by immunoperoxidase staining. This data suggests that, as with hepatitis B, viral antigen is not identifiable in acute CMV hepatitis in the immunocompetent host, perhaps due to active destruction of infected cells. The immunoperoxidase technique for CMV appears to be of little value in the diagnosis of acute CMV hepatitis.

Adult↗

PubMedDate not supplied

Orthotopic liver transplantation: a pathological study of 63 serial liver biopsies from 17 patients with special reference to the diagnostic features and natural history of rejection.

The histopathological features of orthotopic liver transplants were evaluated in 63 serial biopsy specimens from 17 patients. Biopsies were taken at the time of insertion of the liver (six biopsies), at the time of development of liver function abnormalities (11 biopsies) and as follow-up to previously abnormal biopsies (46 biopsies). The biopsies taken at the time of insertion all showed diffuse hepatocellular ballooning with confluent areas of necrosis in one case. Biopsies taken at the time of onset of rejection (nine cases) all showed a mixed portal inflammatory infiltrate, bile duct damage and central or portal vein endothelialitis (i.e., attachment of lymphocytes to the vein endothelium). Follow-up biopsies showed several patterns including: (i) resolution of changes of acute rejection with subsequent development of recurrent acute or chronic rejection (four cases); (ii) prolonged acute rejection simulating extrahepatic biliary obstruction (four cases); (iii) prolonged acute rejection with predominance of eosinophils simulating a drug reaction (one case); and (iv) rapidly progressive acute rejection leading to death (one case). Biopsy of the transplanted liver at the time of transplantation is useful to provide a baseline for comparison with later biopsies. Biopsy at the time of onset of changes in liver function is essential to confirm the presence of rejection prior to alteration of immunosuppression.

Adolescent↗

PubMedDate not supplied

Immunodeficiency-disease-associated atypical chronic hepatitis: a clinicopathologic study.

Chronic hepatitis occurring in patients with primary immunodeficiency disease is an uncommonly reported phenomenon. This study describes our experience with 3 patients with various immunologic abnormalities who developed chronic atypical lymphocytic infiltrates in the liver. There was a temporal relationship to Epstein-Barr virus infection in 2 cases and hepatitis A in 1. In view of the increased incidence of malignant lymphoma in several of the primary immunodeficiency states, these cases present a difficult diagnostic challenge. The recognition of the association of infiltration of the liver with small cleaved lymphocytes and a viral infection in an immunodeficient patient should alert the pathologist to the possibility that the infiltrate does not represent malignant lymphoma. These cases may be analogous to similar virus-associated lymphoproliferative disorders described in the acquired immunodeficiency of renal transplantation.

Adolescent↗

PubMedDate not supplied

Fatal colchicine toxicity: report of a case.

This report describes fatal colchicine toxicity occurring after a total dose of 9.3 mg. The reaction was characterized by leukopenia, thrombocytopenia, hypotension. disseminated intravascular coagulation and metabolic acidosis. Autopsy findings included a markedly hypocellular bone marrow, epithelial atypia of the trachea and esophagus, mid-zonal hepatic necrosis, sepsis and small vessel occlusion by fibrin thrombi. Possible mechanisms of colchicine toxicity are discussed.

Aged↗