Bartonellosis. An immunodepressive disease and the life of Daniel Alcides Carrión.

The history of human Bartonellosis, a unique South American biphasic bacterial disease, is reviewed. The course of this disease and its natural history offer many puzzling problems. Its geographic distribution, its absence of a natural reservoir, the development of transient immunosuppression during the acute hematic phase, and the subsequent development of vascular proliferations are highlighted.

Verruga peruana mimicking malignant neoplasms.

We have shown that in some cases fully developed florid verruga peruana nodules, as well as late-resolving, deeply situated lesions, can histologically suggest a variety of tumors to experienced pathologists. The compact proliferation of endothelial cells characteristic of florid verruga lesions can give rise to two pseudoneoplastic histologic patterns. One consists of sheets or islands of cells arranged in an epithelioid or pseudoepithelioid pattern (cases 1 and 2) in which the following histologic diagnoses were considered: squamous carcinoma, sweat gland carcinoma, epithelioid hemangioendothelioma, epithelioid sarcoma, melanoma and metastatic carcinoma.