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Am J Rhinol. 2007 Sep-Oct;21(5):548-50.

Can we smell without an olfactory bulb?

Author information

1
Department of Otorhinolaryngology, Cliniques Universitaires Saint Luc, Brussels, Belgium. philippe.rombaux@orlo.ucl.ac.be

Abstract

BACKGROUND:

Lack of an olfactory bulb (OB) is typically associated with anosmia.

METHODS:

We present a patient with subnormal olfactory function in whom the OB could not be detected with magnetic resonance imaging (MRI).

RESULTS:

Olfactory function was evaluated on two occasions. Orthonasal olfactory function was assessed with the "Sniffin' Sticks" test providing a score equivalent to hyposmia. Retronasal olfactory function was studied with "smell powders" indicating a decreased, but not absence of, olfactory function. Importantly, chemosensory event-related potentials were clearly present in response to olfactory and trigeminal stimuli.

CONCLUSION:

This indicates that olfactory function may be present in some subjects even when an OB can not be detected with MRI.

PMID:
17999787
DOI:
10.2500/ajr.2007.21.3067
[Indexed for MEDLINE]

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