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Progressive cutaneous protothecosis.

The diagnosis of severe progressive cutaneous protothecosis in a 34-year-old woman was made by skin biopsy and culture. Analysis of host defense mechanisms revealed a persistent defect in the ability of the patient's PMN to kill the infecting organism. Specific IgG and IgE antibody was demonstrated. Serum levels of complement and immunoglobulins were normal or elevated. The patient was not anergic and peripheral blood lymphocytes responded to nonspecific mitogens. Treatment with amphotericin B and tetracycline resulted in resolution of skin lesions and negative cultures.

Adult↗

Protothecosis: an unusual cause of chronic subcutaneous and soft tissue infection.

Protothecosis of subcutaneous and soft tissues is a rare occurrence in humans. We present two patients with chronic subcutaneous protothecosis affecting the elbow and foot respectively. Both patients had been treated with local corticosteroid injections and had recent exposure to water. The diagnosis was made histopathologically in both cases and confirmed by culture in one case. Histopathology showed typical Protothecal sporangia with surrounding mixed inflammatory infiltrate including necrotizing granulomas. Organisms stained positively with periodic acid-schiff, Gomori's methenamine silver, and Gridley fungus stains. In one case, intravenous chemotherapy was required to eliminate the pathogens. Histopathologic identification of the organisms is vital to ensure adequate therapy and avoid chronic smoldering infection.

Chronic Disease↗

Dermatologic manifestations of infections in immunocompromised patients.

Thirty-one immunocompromised patients (22 renal allograft recipients, 5 patients receiving chronic corticosteroid therapy, and 4 patients undergoing chemotherapy for acute leukemia) with significant dermatologic infection, excluding typical cellulitis and herpesvirus infections, were retrospectively identified over a 12-year period. Of these 31 patients, 15 (48%) had infection restricted to their skin, 6 (19%) appeared to have primary cutaneous infection that spread hematogenously to other parts of the body, 2 (6%) had infections of adjoining nasal tissue that spread to contiguous skin, and 8 (26%) appeared to have disseminated systemic infection that spread to the skin. In six of the eight patients with apparent secondary skin involvement, the development of the cutaneous lesion was the first clinical indication of disseminated infection. Eleven immunocompromised patients (35%) with bacterial infection of the skin or subcutaneous tissue were identified. These patients could be divided into three categories: leukemic patients with bacteremic gram-negative infection metastasizing to the skin (3 cases), renal transplant recipients with recurrent staphylococcal infection on and around the elbow ("transplant elbow") or streptococcal sepsis from a site of cellulitis (5 cases), and immunocompromised patients with opportunistic bacterial infection due to Nocardia asteroides or atypical mycobacteria (3 cases). Seventeen immunocompromised patients (55%) with fungal infection of the skin or subcutaneous tissue were identified. These included 12 patients with opportunistic fungal infection (Cryptococcus neoformans, 4 cases; Aspergillus species, 3 cases; Paecilomyces, 2 cases; Rhizopus species, 2 cases; and Candida tropicalis, 1 case) and 5 patients with extensive, confluent cutaneous dermatophyte infections. One patient with protothecosis and two patients with extensive papillomavirus infection were identified. Of these latter two cases, one had his immunosuppression discontinued, with clearing of his extensive warts; the other had confluent warts of the face and neck that subsequently underwent malignant degeneration to squamous cell carcinoma while chronic immunosuppressive therapy was continued.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗

The role of surgery in the management of uncommon skin infections.

BACKGROUND: Some infections do not respond readily to antibiotic therapy. In particular, fungi and mycobacteria often require prolonged treatment, which is expensive and prone to adverse effects. OBJECTIVE: To investigate the role of surgery in the treatment of skin infections. METHODS: Literature review. RESULTS: Infections caused by atypical mycobacteria, certain fungi, and those involving joints often respond well to surgical treatments. In several situations excision produces a higher cure rate than antibiotic treatment. CONCLUSION: Excision, drainage, or debridement has been shown to be superior to drug therapy in several infections and a reasonable alternative in others.

Aspergillosis↗

Generalised protothecosis in a collie dog.

A case of generalised protothecosis in a Collie dog is discussed. A long-standing history of severe colitis was the major clinical sign. Dissemination to many organs was confirmed histologically. Possible pathogenesis is discussed along with a review of the literature. The possibility of a breed disposition in Collie dogs is discussed. The organisms are ubiquitous in the environment and generalised disease suggests the possibility of immune competence.

Animals↗