Acute leukemia.  An atypical case presenting with gingival manifestations. 
A case of acute myeloblastic leukemia is reported in which the mode of presentation was an atypical gingival lesion.  A definite diagnosis was not made until the patient was in a final stage due to non-diagnostic histologic material.  One must be suspicious of any gingival lesion, particulary if there is a sudden onset of bleeding or hyperplasia.  Leukemia must be considered even if initial investigations are negative, as in the case presented.