[Necrotizing fasciitis caused by Streptococcus pyogenes: a case report].

Necrotizing fasciitis caused by group A Streptococcus is an uncommon infection of the subcutaneous tissue and fascia, with a high mortality rate due to its rapid progression to shock and multiorgan failure. It usually develops in extremities after trauma or previous injury. Early diagnosis is essential as well as fast and aggressive management.

[Subacute diseminated histoplasmosis in HIV patients].

Histoplasmosis is a cosmopolitan mycosis caused by Histoplasma capsulatum. It is endemic of Río de la Plata's riverbed and in immunocompromised patients may be deadly. We present two patients with Human Immunodeficiency Virus diagnosed with subacute disseminated histoplasmosis, which is a marker of Acquired Human Immunodeficiency Syndrome.

[Paraneoplastic dermatomyositis related to breast cancer: rare clinical association in two patients].

Paraneoplastic dermatomyositis is an inflammatory disease of the connective tissue that is caused by inmmunologic events in the presence of malignant tumors. It is more likely to happen in middle aged women and is related to ovarian, pancreatic, stomach and colon cancer and non Hogdkin lymphoma. We present two cases of dermatomyositis, with amyopathic origin associated to breast cancer.