Among the micro-organisms that may affect the respiratory apparatus are the protozoa. The diseases they may give rise to constitute a relatively uncommon group of respiratory ailments with, in the majority of cases, an underlying clinical situation corresponding to states of suppressed immunity (AIDS, transplants, malign haemopathies, corticotherapy, etc.). Other factors, such as visits to endemic areas and immigration, also have to be taken into account.In view of the probable increase in the number of cases and the appearance of new emerging diseases, it is the intention of the present work to review the publications available, in different fields of medicine, that refer to the principal kinds of protozoa (Entamoeba,

Necrobiosis lipoidica (NL) is a disease of collagen. Squamous cell carcinomas developing in areas of chronic ulceration and scarring have been well documented in a variety of skin diseases but rarely in areas of necrobiosis lipoidica. The case history of a 76-year-old female is presented, whose squamous cell carcinoma appeared 30 years after the diagnosis of necrobiosis lipoidica. The clinical and histopathological picture is described, stressing the importance of the unusual association of the two pathologies in the prognostic.

An 18‐year‐old woman was referred for the evaluation of a dull gray macule on the left breast. From the age of 13 years, the patient noted breast asymmetry beginning with the development of the left breast and the presence of a pigmented stain on its border. Physical exploration revealed hypoplasia of the left breast and a homogeneous, light brown macule on the side of the breast (Fig. 1) without infiltration. Papules and pustules were located mainly around the Becker's nevus on the left anterior chest wall. Biopsy specimens with Fontana's stain disclosed a hyperpigmented acanthotic epidermis. A diagnosis of Becker's nevus, acne, and hypoplasia of the breast was made. 1 Hypoplasia of the left breast and a homogeneous light brown macule with acneiform lesions

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