Biomedical subjects
Publications and source records attributed to A Rocamora.
Lauryl gallate (antioxidant food additive E-312) prevents the formation of dimethylbenzanthracene-induced skin tumours in mice, and kills, selectively, tumoral cells on established tumours. This results in total remission, after topical application of the compound on the tumoral mass, without affecting the surrounding tissue.
Self-healing juvenile cutaneous mucinosis is a new entity distinct from previously described forms of cutaneous mucinosis. We present a new case in a 26-year-old female patient who began abruptly with a papular eruption, involving the scalp, face, neck and trunk, accompanied by periarticular papules on the hands and arthralgias. No associated disease could be detected and the lesions resolved spontaneously within a few months. This is the first case described in an adult patient.
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The human hematopoietic progenitor cell antigen (CD34) is a cell surface protein expressed by human hematopoietic progenitor cells, vascular endothelium, and many mesenchymal tumors. Sections from six samples of normal skin and from 41 epithelial tumors of the skin were studied. Immunostaining of epithelial cells from the external root sheath below the attachment of the arrector pili muscle and above the matrix cells was noted in normal samples. Tumors derived from or differentiated toward cells of the outer sheath, especially trichilemmomas, were immunostained with QBEND/10 (anti-CD34 antibody), whereas other epithelial tumors studied were negative. CD34 could serve as a marker of outer sheath cell derivation and may well be of value in the distinction between trichilemmomas and other lesions with similar histopathological features.
We describe a patient with severe eyelid and lip angioedema lesions in whom biopsy specimens from angioedematous labial mucosa disclosed features of lymphomatoid granulomatosis. To our knowledge, angioedema lesions with characteristic histological findings of lymphomatoid granulomatosis have not been previously described as a presenting sign of this disease.
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Periarticular fibrous nodules have been described in patients with late-phase acrodermatitis chronica atrophicans (ACA) in the setting of Lyme borreliosis. We report the clinical and histopathological study of two patients with periarticular fibrous nodules and with Lyme borreliosis and discuss the relationship between these nodules and ACA.
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Three patients with vegetating iododerma as a result of potassium iodide therapy are presented. The first patient had polyarteritis nodosa, the second had monoclonal gammopathy of undertermined significance, and the third had multiple myeloma. Vegetating iododerma probably represents an idiosyncratic response to iodides; patients with polyarteritis nodosa and paraproteinemias may be predisposed.
Neutrophilic eccrine hidradenitis is an uncommon, self-limited dermatosis with a variable clinical presentation. It seems to be due to chemotherapeutic drugs in most cases. Necrosis of the eccrine gland associated with a neutrophilic infiltrate is the histologic hallmark of this disease. We report two additional cases in neutropenic patients with acute myelogenous leukemia in which there was a striking lack of neutrophil infiltration. A new term, drug-associated eccrine hidradenitis, is suggested.
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A review was conducted of 335 malignant melanomas to identify variant morphologic patterns that might be confused with other tumors. In all, 27 predominantly amelanotic neoplasms with unusual histologic features were selected for additional study. These included nine with an adenoid or pseudopapillary pattern, seven small cell neoplasms, five with prominent myxoid stroma, four with a hemangiopericytoma-like appearance, and two composed of neoplastic cells with a signet-ring configuration. A diagnosis of melanoma was confirmed in all cases by Fontana-Masson strains for melanin pigment, electron microscopic examination, or the results of immunohistochemical analyses for cytokeratin, vimentin, S-100 protein, and the HMB-45 antigen. One tumor was associated with a congenital hairy melanocytic nevus, five were vulvovaginal lesions, four arose in the sinonasal tract, and one occurred in the rectum. Four of the specified microscopic patterns were observed in both primary and secondary neoplasms; the two signet-ring cell melanomas were recurrent lesions. The authors conclude that malignant melanomas may assume the histologic guise of adenocarcinomas, small cell carcinomas, and sarcomas, in a variety of tissue sites. Special studies designed to detect melanocytic differentiation are therefore appropriate in diverse differential diagnostic settings.
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