RESUMEN
Fanconi-Zinsser's disease is a serious involutive myelopathy responsible for pancytopenia, hyperpigmentation, oralplakia and onychodystrophy, together with lesser dysmorphisms in many cases. The marrow blood picture is reminiscent of the better-known Fanconi's disease, while the skin and mucosa picture is similar to that of congenital dyskeratosis - hence the combined name. A typical case, but complicated by Lewandowsky's disease for the first time in the literature, is presented. Papova-virus was noted in the typical verrucae. The modern "pathology due to genome instability" is examined. Lewandowsky's disease is regarded as a familial form and precancerous, owing to its possible Bowenoid transformation. The association is seen as particularly significant in stressing the disorder of the immunocompetent syste, this being most evident from the finding of serum anti-red-cell auto-antibodies and a deficiency of T lymphocytes. Fanconi-Zinsser's disease has only been reported 21 times in the literature, mostly in males. Incomplete forms are, however, noted in relatives, suggesting that it originates in a genetic disorder whose transmission modality is not clear, though incomplete dominance is suspected. Genome instability is probably responsible behind the onset of the disease and its neoplastic complications - these being also feature of other forms provoked by such instability, such as Bloom's syndrome and ataxia telengiectasia. Fanconi's disease also has marked neoplastic tendencies. Clinically, Fanconi-Zinsser's disease can be classified as distinct, since it has signs and an evolutive modality that distinguish it from Franconi's disease, Estren-Damesheck's syndrome and amegakaryocytic thrombocytopenia. Genetically, it can be seen that all these diseases are referable to "pathology due to genome instability".