Chronic use of alcohol is a known cause of cerebellar atrophy. This finding could be a valuable diagnosis support when there are not other information sources. In this case report, we describe a 65-year-old male patient who was referred from primary care to specialized consultation because a depressive syndrome it was unresponsive to treatment with desvenlafaxine and lorazepam. In psychopathological exploration we found overvalued ideas of suffering some kind of injury and damage by the family, which oriented the diagnostic hypothesis of delusional disorder with secondary mood symptoms, although the clinical suspicion of abuse of alcohol was proposed as a differential diagnosis. The continuing minimization and denial of consumption by the patient as well as their reluctance to incorporate an external informant made that the workup was a key element to elucidate the diagnosis. We found a discrete increase in transaminases, gamma glutamyl transferase and alkaline phosphatase. Magnetic resonance imaging showed cerebellar atrophy (vermian and, in a lesser extent, in both hemispheres). Once the patient was confronted with these results, he agreed to disclose his problem, which fulfilled alcohol dependence criteria. After that, he accepted to initiate treatment and detoxification in a specialized unity.