Smell

The faculty or power of perceiving odours or scents by means of the organs in the nose.

Aberrations of the sense of smell can be thereafter head injury and cerebral tumours 1).

see Olfactory Testing

1)
Schurr PH. Aberrations of the sense of smell in head injury and cerebral tumours. Proc R Soc Med. 1975 Aug;68(8):470-2. PubMed PMID: 1202480; PubMed Central PMCID: PMC1863832.