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Biomedical subjects

J Castanet

Publications and source records attributed to J Castanet.

At least 73 records · Page 4Linked to original sources
PubMed1993

Porphyria cutanea tarda and antibodies to hepatitis C virus.

We have studied the prevalence of hepatitis C virus antibodies (anti-HCV) in 13 patients suffering from sporadic porphyria cutanea tarda. The sera were tested by Abbott second-generation enzyme immunoassay; seropositivity was confirmed by Ortho second-generation recombinant immunoblot assay. Ten cases (76.1%) were anti-HCV positive; one patient was also seropositive for HIV. This preliminary study suggests that HCV could be a frequent triggering factor for sporadic porphyria cutanea tarda.

Adult↗
PubMed1993

Follicular mycosis fungoides. A clinical and histologic variant of cutaneous T-cell lymphoma: report of two cases.

We report two cases of mycosis fungoides with marked, pleomorphic follicular manifestations. Follicular hyperkeratosis, comedo-like lesions, acquired epidermal cysts, and patchy alopecia developed in various locations in both patients. Findings of histopathologic and immunohistochemical studies showed atypical CD4+ T lymphocytes infiltrating the follicles without follicular mucinosis. Focal expression of intercellular adhesion molecule type 1 was observed within the cyst walls. These findings suggest that the follicular lesions were specific for mycosis fungoides. These manifestations represent a distinct clinical and histologic form of mycosis fungoides. This variant probably accounts for cases of mycosis fungoides with clinically suspected alopecia mucinosa in which follicular mucinosis cannot be histologically proved.

Aged↗
PubMed1993

[Malignant lymphoma in rheumatoid arthritis treated by low doses of methotrexate].

The authors report a case of non-Hodgkin's malignant lymphoma which developed in a patient under low-dose methotrexate for rheumatoid arthritis. Although rheumatoid arthritis without immunosuppressive therapy may be associated with an increased incidence of malignant lymphoma, the immunosuppressive effects of methotrexate may further promote the development of malignant lymphoma.

Aged↗
PubMed1992

[Digital necrosis in Raynaud's phenomenon revealing a testicular seminoma. Value of prostacyclin].

A testicular tumour could be diagnosed by the occurrence of a Raynaud's phenomenon complicated by severe digital arteritis. The arteritis rapidly regressed under prostacyclin therapy. Such vascular manifestations are frequent in testicular carcinoma, but they usually develop after chemotherapy. To our knowledge, this is the first case where they preceded the diagnosis and specific treatment of a tumour of the testis.

Adolescent↗
PubMed1992

Escherichia coli cellulitis: two cases.

We report two cases of cellulitis of the legs occurring in adults where Escherichia coli (E. coli) was, or probably was, the causative bacterial agent. E. coli and other gram-negative bacilli cellulitis are rarely reported. However, in cellulitis, the causative microorganism is rarely identified, and some cases of E. coli cellulitis could be unrecognized. Furthermore, classical risk factors for gram-negative sepsis are characterized by a state of leucocyte dysfunction which could explain the possibility of a severe, even lethal, course of gram-negative cellulitis. Therefore, the occurrence of cellulitis in patients with risk factors should prompt attempts at isolating the pathogenic microorganism, and a broad spectrum of antibiotic therapy should be initiated.

Aged↗
PubMed1991

Structural changes of the periosteocytic area in Vipera aspis (L.) (Ophidia, Viperidae) bone tissue in various physiological conditions.

Microradiographs of ribs and vertebrae of the snake Vipera aspis, over an annual cycle, show a significant enlargement of the osteocytic lacunae in the winter months and, for the breeding females, during the period of embryo development. This enlargement is due to resorption of bone substance (periosteocytic osteolysis). The objection that such morphological findings could as well be explained by the formation of new, larger osteocytes derived from recent osteoblasts does not apply to the present animal model. No internal bone remodelling occurs during the annual seasonal cycle and therefore no new osteoblasts would have differentiated to osteocytes in the interior of the bone. In the vertebrae, an additional process is indicated as an area of decreased mineral density, termed demineralization halo, around the periosteocytic lacunae. An electron microscopy study suggests that this process of demineralization is not the first stage of periosteocytic resorption, but an additional process of demineralization. Thus, both osteolysis and demineralization halos in the perilacunar osteocytic region of the bone tissue represent reversible biological processes mediated by the osteocytes.

Animals↗