[Polycystic endodermal heterotopy of the atrioventricular node].

We present the two first Spanish cases about the endodermic heterotopia of the atrioventricular node. This is an infrequent and probably congenital lesion, with a not well known histogenesis and associated with heart blocks and sudden death, which affects women in most cases. The first observation attaches a 55 years-old woman with an acute leukemia who died during the first chemotherapy treatment.

[Systemic amyloidosis: clinico-pathologic study of 69 cases].

A series of 69 cases of systemic amyloidosis is discussed (12 primaries; 7 due to myeloma; 44 reactive; 5 due to familiar mediterranean fever and 1 portuguese familiar polyneuropathy) in which their clinical aspects, topographical distribution of the deposit and histochemical characteristics are studied using the potassium permanganate technique. According to sings and symptoms of presentation and topography there is a remarkable overlapping in the five types of amyloidosis. Only macroglossia was more frequent in primary amyloidosis (p less than 0.

[The immunological characterization of 63 cases of Hodgkin's disease with a panel of 8 antibodies].

Sixty three cases of Hodgkin's disease are studied (two with lymphonodular predominance, 15 with diffuse lymphocyte predominance, 26 nodular sclerosis, 15 mixed cell and 5 lymphocyte depletion) with a panel of 8 monoclonal antibodies, material routinely used and included in paraffin: Ber H2 (CD30), Leu M1 (CD15), Common Leukocyte Antigen (CD45), L26 (CD20), MB2, UCHL1 (CD45 RO), MTI (CD43) and Epithelial Membrane Antigen. Ber H2 turned out to be the most usefull marker, positive in 100% of cases, independently of the histologic type. Positiveness with Leu M1 ranged from 100% (2/2 cases) of lymphonodular predominance, to 53.

[Adult T-cell lymphoblastic lymphoma associated with quiescent multiple myeloma].

We report the case history of a female patient suffering of a T lymphoblastic lymphoma with an atypical presentation and evolution, consisting of pleuropericardiac effusion without mediastinic masses that coexists with a plasma cell dyscrasia that fulfils the criteria for stationary multiple myeloma. The possible pathogenic relationship between both processes is discussed, emphasizing the functional evolutive dissociation between the cellular constituents of both neoplasias, immature T lymphoblasts and plasma cells, respectively; this constitutes the first reported case in literature.