Hairy cell leukemia haemopathy is a rare lymphoïd haemopathy type B. 8 cases are reported and diagnosed at Hôpital Aziza Othmana over a period of 20 years between 1979 and 1999, 7 men and one women. The mean age of the patients is 51 years, with externe ages from 42 to 81 years. 4 patients consulted for an infections and, or anaemia syndrome. The disease was revealed due to the presence of an isolated splenomegaly in other cases. At the clinical examination, the spleen is hypertrophied in 7 patients out of 8. Pancytopenia is observed in 50% of the patients. Only one patient has presented a moderated hyperleukocytosis at 11,000/mm3 related to the presence of moving on tricholeukocytes. The myelogramme is pocr. It allowed to mention the diagnosis in 6 cases out of 8. Bone Marrow biopsy revealed a diffuse infiltration by TCL with a reticulinic fibrosis in all patients. 4 patients out of 8 have been splenectomized. Cytopenies have been corrected in all patients. Only one patient has been treated by alpha Interferon for 3 years with a partial hematological response. A relapse was observed once the Interferon was stopped. With the introduction of new drugs such purine analogues. The HCL treatment has been revolutionarized thanks to the improvement of the rate of complete response (from 10% to 80% of CR). If splenectomy is still observed in HCL for splenomegalic and or severe cytopenia, our findings could be improved thanks to new purine analogues.