Over the past few decades, mental lexicons have been integrated into cognitive models to study aphasic pathologies. This paper deals with a case study of lexical and semantic tasks performed with a subject suffering from an inability to access word meanings auditorily. The study examines how the subject can access pre-semantic phonological aspects and perform written comprehension tasks, but not access word meanings during auditory processing. Findings from previous research on lexicon-free models point to similar observations.