[Diagnosis and differential diagnosis of Kallmann syndrome].

OBJECTIVE: To study diagnosis and differential diagnosis of Kallmann syndrome. METHODS: The examinations including routine karyotyping, sex hormone, GnRH stimulation test and MRI were performed. RESULTS: Cytogenetic analysis of his peripheral lymphocyte by G banding showed a normal male karyotype. GnRH stimulation test presented a good reaction. Plasma levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH) and testosterone were very low. Absent olfactory bulb was found by magnetic resonance imaging (MRI). CONCLUSION: Karyotype analysis, sexual hormone, GnRH stimulation test and MRI are very important the diagnosis of Kallmann syndrome.