The Importance of a Multidisciplinary Approach in a Patient with Long-term Multisystemic Manifestations of Unrecognized Hereditary Hemorrhagic Telangiectasia.

Hereditary hemorrhagic telangiectasia (HHT), also called Rendu-Osler-Weber syndrome, is a rare autosomal dominant multisystemic vascular disorder, characterized by widespread mucocutaneous teleangiectasias, frequent visceral arteriovenous malformations (AVM) and a tendency for bleeding. This diagnosis should be suspected in all dermatological patients with generalized mucocutaneous vascular lesions at sites of predilection, associated frequent epistaxis and a positive family history. The aim of this paper is to emphasize the importance of a multidisciplinary approach, the role and timely cooperation of dermatologists and otorhinolaryngologists in the early clinical recognition and diagnosis of the disease.

Short Overview of Some Assays for the Measurement of Antioxidant Activity of Natural Products and Their Relevance in Dermatology.

Impaired systemic redox homeostasis is implicated in the onset and development of various diseases, including skin diseases. Therefore, continuous search for natural products with antioxidant bioactivities applicable in biomedicine is attractive topic of general interest. Research efforts aiming to validate antioxidant potentials of natural products has led to the development of several assays based on various test principles.

The Onset of Systemic Oxidative Stress Associated with the Accumulation of Lipid Peroxidation Product Acrolein in the Skin of Patients with Small-Vessel Vasculitis.

Small-vessel vasculitis (SVV) is the inflammation of the vessel wall that can result in hemorrhage and/or ischemia. Among the histological findings in SVV are increased infiltrating neutrophils, which, due to their oxidative burst and myeloperoxidase activity, release excessive reactive oxygen species, triggering a chain reaction of lipid peroxidation and yielding reactive aldehydes such as acrolein. The implication of oxidative stress in the pathogenesis of SVV was studied, focusing on acrolein immunohistochemistry in the affected skin vessels and systemic stress response.

[Henoch-Schönlein purpura with late-onset necrotising glomerulonephritis--a case report].

Henoch-Schönlein purpura (HSP) is the most common systemic vasculitis in children, while it is rare in adults. Typical clinical manifestations include palpable purpura without thrombocytopenia and/or coagulopathy, arthritis/arthralgia, abdominal pain, and/or renal involvement. In adulthood the disease tends to be more serious than in children, with renal manifestations developing over a period of several days to one month after initial symptoms.

Progressive pigmented purpuric dermatitis and alopecia areata as unusual skin manifestations in recognizing hereditary hemochromatosis.

Hereditary hemochromatosis (HHC) is a common genetic disorder of iron overload, caused by mutations in the HFE gene. If untreated, abnormal accumulation of iron may lead to organ damage and premature death. Significant changes in the symptomatology of HHC have been observed in recent years, and its full clinical expression is rarely seen.

[The role of oxidative stress and iron in pathophysiology of rosacea].

Rosacea is a common skin disease of unknown etiology. The aim of the present paper is to explain the role of oxidative stress triggered by UV light and iron metabolism in the pathophysiology of rosacea. It was recently described that the number of ferritin positive cells was significantly higher in skin samples of rosacea patients compared to controls of healthy skin samples.

Oxidative stress and ferritin expression in the skin of patients with rosacea.

Background: Rosacea is a common chronic light-sensitive inflammatory skin disease of unknown origin. The purpose of this work was to determine the parameters of oxidative stress, antioxidative capacity, and the pathophysiologic role of ferritin expression in skin cells of patients with rosacea.

Objectives: The investigation consisted of measurements of serum peroxide levels, serum total antioxidative potential levels, and immunohistochemical analyses of ferritin in skin tissue samples.

Pyoderma gangrenosum associated with ulcerative colitis.

We report the case of a 45-year old man with non-healing ulcers located on his chest, lumbal, sacral, retroauricular areas and forehead. Both clinical and histopathological examinations suggested pyoderma gangrenosum (PG). For six months the diagnosis of ulcerative colitis was established.

Hereditary benign telangiectasia.

Hereditary benign telangiectasia is a very uncommon disorder characterized by generalized telangiectasias and angiomatous lesions of the skin. The diagnosis should be suspected in patients with such cutaneous signs, positive family history, no associated bleeding problems, and no mucosal involvement. We present a 74-year-old woman with typical clinical features of hereditary benign telangiectasia.

Etiopathogenesis, classification, and current trends in treatment of rosacea.

Rosacea is a common chronic dermatosis characterized by varying degrees of flushing, erythema, telangiectasia, edema, papules, pustules, ocular lesions, and phymas. Etiology and pathogenesis of rosacea are still unknown. Many possible causes have been described as inducing the disease or contributing to its manifestation, such as genetic predisposition, abnormal vascular reactivity, changes in vascular mediating mechanisms, Helicobacter pylori infection, Demodex folliculorum infestation, seborrhea, sunlight, hypertension, and psychogenic factors.