Background: Kallmann's syndrome (KS) was first mentioned in 1944 as an asso
ciation of anosmia and hypogonadotropic hypogonadism. Causes are multiple g
enetic defects the most common of which is the x-linked KS appearing mostly
in men. However, autosomal dominat and autosomal recessive forms have also
been described. Patient: We present a case of KS with normosmia (male, 39
years of age). All symptoms of hypogonadotropic hypogonadism were present.
Results: Psychophysical olfactory testing revealed left-sided anosmia with
right-sided normosmia which was confirmed by electrophysiological measures
of olfactory function. Magnetic resonance imaging indicated aplasia of the
left olfactory tract and bulb, whereas the right-sided structures appeared
to be normal. Conclusions: As indicated in this case with lateralized anosm
ia and contralateral normosmia, overall olfactory function strongly depends
on the "best" nostril. Therefore, in many clinical situations, lateralized
olfactory testing appears to be extremely important.