Biomedical subjects
L F Montes
Publications and source records attributed to L F Montes.
Cycloheximide in dermatology.
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Response of leiomyosarcoma to cryosurgery: clinicopathological and ultrastructural study.
Two elderly patients with primary leiomyosarcoma (LMS) of the scalp were treated cryosurgically. Complete involution of both tumours with full epithelialization of the affected sites was achieved. Pretreatment biopsies and sequential biopsies obtained after treatment allowed observation of microscopical changes taking place during tumour involution. Gradual shrinkage of both LMS, closely monitored under the operating microscope, started immediately after the initial freezing. Light and electron microscopic observation of the shrinking LMS revealed a rapid disappearance of the tumoral architecture. Early accumulation of eosinophils and erythrocytes was followed by migration of lymphocytes and plasma cells. Capillary neoformation, fibroblasts and newly formed connective tissue fibres became apparent during the later stages of healing. Two years after treatment, both patients showed no signs of recurrence. These results suggest cryosurgery--performed in an extended protracted fashion--can be a valuable therapeutic choice in the management of LMS, particularly when surgical excision is not feasible.
Folic acid and vitamin B12 in vitiligo: a nutritional approach.
When compared with the normal population, patients with vitiligo often showed diminished blood levels of folic acid. In a group of fifteen patients with vitiligo, folic acid levels were below normal in the serum of eleven patients, in the whole blood of five patients, and in the erythrocytes of six patients. Vitamin B12 serum levels were below normal in five of the fifteen patients. Ascorbic acid plasma levels were also lowered in four of the patients. In eight patients prolonged oral administration of folic acid with simultaneous parenteral treatment with vitamin B12 and oral ascorbic acid was followed by definite repigmentation without side effects.
Topical griseofulvin in tinea versicolor: a double-blind study.
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Response of varicella zoster virus and herpes zoster to silver sulfadiazine.
The addition of silver sulfadiazine to cultures of varicella zoster virus resulted in inactivation of the viral infectivity. At a concentration of 10 micrograms/ml or higher the virus was inactivated after thirty minutes exposure at 37 degrees C. Forty-two patients with herpes zoster were treated topically with 1 percent silver sulfadiazine cream applied four times a day. All patients experienced complete drying of vesicles, marked reduction erythema and edema, and striking elimination of pain and burning sensation within twenty-four to seventy-two hours. The sooner the treatment began after the onset of symptoms, the more dramatic was the response. Postherpetic neuralgia was either mild or did not occur. Signs of local, systemic, or laboratory-documented toxicity were not observed.
Fungus-host relationship in candidiasis. A brief review.
Candidiasis and its causative agent, Candida albicans, have been under continuous study in our clinics and laboratories for the past 20 years. Cultured cells of C albicans and tissues from natural and experimental infections were used for observations by light microscopy, transmission electron microscopy, scanning electron microscopy and freeze fracture techniques. In cultures, the cells of C albicans revealed a more complex cell wall, plasma membrane, intracellular organelles, and biochemical organization than those described in classic text-books on mycology. In infected tissues, noteworthy characteristics of C albicans were prominent vacuoles and invasion of host cells with subsequent intracellular localization and lysis of tissues surrounding the fungus. These findings are discussed in relation to their importance in the pathogenesis and management of candidiasis and to the mechanism of action of anticandida agents.
Percutaneous steroid therapy of lumbago.
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Topical treatment of acne rosacea with benzoyl peroxide acetone gel.
A group of patients with acne rosacea was treated with 5 percent benzoyl peroxide acetone gel for four weeks and then with 10 percent benzoyl peroxide acetone gel for an additional four weeks. A parallel group of patients was treated with a matching placebo (acetone gel vehicle). At the end of the first four weeks of treatment the dropout rate due to lack of improvement was 23 and 63 percent for benzoyl peroxide acetone gel and placebo, respectively. Benzoyl peroxide acetone gel was superior to placebo with respect to improvement in the overall severity of the lesions when judged by photographs, and by reduction of erythema, papules, and pustules. Results after treatment with benzoyl peroxide acetone gel were better during weeks five to eight than during weeks one to four for all lesions except telangiectasia. Benzoyl peroxide acetone gel was superior to placebo when the overall responses were compared. In addition, the benzoyl peroxide acetone gel-treated group, but not the placebo-treated group, showed a significantly better response during weeks five to eight compared to weeks one to four.
Sebaceous adenocarcinoma.
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Scanning electron microscopy of oral lesions in chronic mucocutaneous candidiasis.
The oral surfaces of 12 patients with chronic mucocutaneous candidiasis were studied by scanning electron microscopy (SEM). Candida albicans in massive numbers populated the surface of the infected mouth of each patient. Although pseudohyphae were the predominant forms, blastospores and chlamydospores were also found. Pseudohyphae penetrated the epithelium and seemed to enter through holes in the keratinized cells. Because specimen processing for SEM can be completed within six hours, the scanning electron microscope can be used to identify C albicans more rapidly than culture methods.
Scanning electron microscopy of yeasts in seborrheic keratoses.
Lesions of seborrheic keratoses were studied by scanning electrom microscopy. Numerous yeasts were present on the karatinized cells and hairs associated with the lesions. Surfaces of some yeasts were smooth and others were ruffled. The ruffles suggested the presence of a glycocalyx. The yeasts exhibited the morphological features of Pityrosporum ovale.
Chronic mucocutaneous candidiasis and disseminated histoplasmosis.
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A tridimensional view of seborrheic keratosis.
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Immunohistochemical demonstration of basement membrane collagen in normal human skin and in psoriasis.
Antibodies prepared against the collagen C-chain derived from human placenta specifically strain the epidermal basement membrane of normal human skin as well as the basement membrane surrounding the skin appendages and capillaries. Using the antibodies, it was observed that all basement membranes in untreated psoriatic plaques appear fragmented and separted into several layers. The results suggest that psoriatic lesions are associated with a general loss of basement membrane integrity which may play a crucial role in the pathogenesis of the disease.
A tridimensional view of intradermal nevi as revealed by scanning electron microscopy.
When scanning electron microscopy (SEM) was applied to the study of intradermal nevi, interesting tridimensional features were recognized. The free surface of the lesions showed ruffled keratinized cells. "Normal" hairs as well as "corkscrew" hairs emerged from the follicular openings. Nevus cells were either round or elongated and surrounded by connective tissue fibers.
Scanning electron microscopy of dermatofibromas.
The three-dimensional morphology of six dermatofibromas was studied by scanning electron microscopy. Hypertrophic epidermal ridges covered with large keratinized cells overlay each dermal lesion. Small collagenous fibers in the tumors contrasted with the bundles of much larger collagenous fibers in the normal dermis peripheral to the lesions.