Omenn's Syndrome: A rare primary immunodeficiency disorder.

Over the last 17 years different forms of severe combined immunodeficiency have been diagnosed at Sultan Qaboos University Hospital, Muscat. Omenn's syndrome is a rare autosomal recessive form of severe combined immunodeficiency. We report a 6 weeks old Omani infant who presented with the characteristic clinical and immunological phenotype of Omenn's syndrome. We take the opportunity to discuss and review the immunological aspect of this rare syndrome.