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Sexual ambiguities are due to varied congenital or hormonal causes. A retrospective study carried out from January 1995 to December 2000 and followed by a prospective study from January 2001 to September 2002 sought to describe the clinical aspects of sexual ambiguities in Internal Medicine in a tertiary hospital Mali. Among 12 patients out of 2223 consultants identified (0.54 percent), 10 of them were phenotypically feminine and 2 phenotypically masculine. The average age of the patients was 14.3+- 8.9 years. Clinically, 3 out of the 10 phenotypically feminine patients presented an anomaly of the external genital organs; 5 out of the 10 had low axillary and pubic hair growth; 4 out of the 10 had delayed puberty; 6 out of the 10 had primary amenorrhoea; 7 out of 10 had hypoplasia of the mammary glands; and3 out of 10 had an inguinal mass. For the the 2 phenotypically masculine patients, one had a bilateral gynecomastia, a macroskelia of 2m04, a low axillary and pubic hair growth and the other had an anomaly of the external genital organs.