The acquired thrombocytopenia is part of a large number of diseases ca
used by a variety of different factors. Besides the classical failure
of bone marrow proliferation respectively the replacement of the bone
marrow with malignant cells, there are immunological disorders and man
y substances which may cause thrombocytopenia. The diagnosis of an ,,i
diopathic thrombocytopenia'' is sometimes posed even at the end of int
ensive diagnostic efforts. Possibly a benign neoplasia is also to caus
e a massive decrease of thrombocytes. We observed preoperatively in on
e patient with extensive stenosis of the sigma, caused by an inflammat
ory tumor a thrombocytopenia with a level under 50 000/ml. A normaliza
tion in thrombocyte blood counts appeared spontaneously after tumor re
section.