We describe a case of primary progressive aphasia (PPA) in a 62 year old right handed Irish woman who had progressive speech and language difficulty over a period of six years. She continued to work for a remarkable length of time and lived independently managing all her activities of daily living. The case posed a diagnostic challenge because initial presentation was suggestive of a conversion disorder. She also displayed signs and symptoms which overlapped with a fronto-temporal dementia and possibly early Alzheimer's disease. In our discussion, we explore the possible reasons for this overlap and the implication for psychiatrists. The need for adequate and sensitive investigations and a multi-disciplinary approach cannot be overemphasised as PPA cases are easily missed depending on the stage at which the patient presents.