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Biomedical subjects

J A Posen

Publications and source records attributed to J A Posen.

8 recordsLinked to original sources

Melanin-producing medullary carcinoma of the thyroid gland. A case report.

A case of melanin-producing medullary carcinoma of the thyroid gland is reported. The histological characteristics of the tumour were typical of medullary carcinoma, immunohistochemical testing for calcitonin was positive, and neurosecretory granules were found to be present on ultrastructural examination. In addition the tumour was producing melanin and melanosomes were identified in the same cells which contained neurosecretory granules, suggesting that the tumour arose from a common precursor cell of neural crest origin capable of producing both calcitonin and melanin.

Adult↗

Radiocolloid liver imaging in tuberculous hepatitis.

Twenty of 22 patients with tuberculous hepatitis had abnormal Tc-99m tin colloid liver scans. However, in the majority of the patients the changes were mild and nonspecific. The most frequent scintigraphic picture was a decreased uptake of the radiocolloid by the liver, with shunting to the spleen and bone marrow. The decreased hepatic uptake was usually mildly heterogeneous, but it was sometimes homogeneous, and in five patients obvious defects were present. The liver was enlarged in six patients and the spleen in six patients. Increased extrahepatic uptake of the radiocolloid was the only abnormality in five patients. The severity of the scintigraphic changes did not correlate with the following histologic findings: number of granulomas, degree of associated fibrosis, degree of hepatocyte swelling, or extent of fatty change.

Colloids↗

Tuberculosis hepatitis: a clinical review of 96 cases.

Hepatic tuberculosis was confirmed in 96 patients presenting with the features of liver disease, only 14 of whom had other concomitant hepatic pathology. Although respiratory symptoms occurred in 74 per cent of cases, these were overshadowed by the abdominal manifestations. The latter most frequently included right hypochondrial pain, abdominal distension, firm tender hepatomegaly, splenomegaly and ascites. Icterus was observed in 11 cases (only one of whom had concurrent hepatic pathology) and liver failure was found in 10 patients. A surgical presentation occurred in three patients. Four of 15 patients with pancytopenia were noted to have hypersplenism. Abnormalities in coagulation were noted in 26 patients (24 with low prothrombin index and two with moderately raised fibrinogen degradation products). The characteristic serum profile included hyponatraemia (64 per cent of cases), raised alkaline phosphatase (83 per cent) and gamma glutamyl transferase (77 per cent), hypoalbuminaemia (63 per cent) and hypergammaglobulinaemia (83 per cent). Transaminase levels were moderately elevated in 78 per cent of cases. Hepatic imaging techniques were frequently misleading. Chest radiographs aided the diagnosis but were normal in 25 per cent of cases. Histologically, acid fast bacilli, caseation and granulomas were seen in 9, 83 and 96 per cent of cases respectively. Adverse prognostic features included age (below 20 years), miliary TB, coagulation defects and the presence of predisposing factors; these were of value in selecting appropriate therapy. The overall mortality was 42 per cent. Liver biopsy was the most useful aid to correct diagnosis which was suspected clinically in only 47 per cent of cases.

Adolescent↗