Pathological or spontaneous rupture of the spleen has been described in a variety of diseases affecting the spleen, with infections being cited as the cause in most cases. In hematological malignancies it is a rare event, despite the frequent involvement of the spleen in these diseases. It has, however, been described in patients with acute and chronic leukemia, Hodgkin's disease, non-Hodgkin's lymphoma of B-cell origin, mycosis fungoides, and so-called histiocytic lymphoma. Here, we present a fatal case of splenic rupture caused by infiltration of a peripheral T-cell lymphoma, unspecified according to the REAL classification. The importance of a correct diagnosis and fast surgery is emphasized.