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The paper presents a description of voice rehabilitation in a patient who was diagnosed six months earlier with idiopathic paralysis of the left half of the larynx. Prolonged untreated paralytic dysphonia, with sustained pathological compensation, had an adverse impact on the psychosocial functioning of the patient. A comprehensive diagnostic method was applied, including subjective self-assessment by Voice Handicap Index (VHI) and scale of vocal tract discomfort (VTD), GRBAS perceptual evaluation by a physician, followed by videolaryngostroboscopy, acoustic voice analysis and maximum phonation time measurement (MCF). After 3 months of intensive voice rehabilitation, the whole test procedure was repeated. A significant improvement in subjective symptoms as measured by VTD scale -- both in frequency subscale (23 vs. 5) and severity subscale (22 vs. 5) was achieved. A similar improvement was found in self- assessment by VHI for the outcome of the total score (62 vs. 16) and in perceptual evaluation by GRBAS (G1R0B0A0S0 vs. G3R0B3A3S2). Desirable effects of the rehabilitation were also, manifested by improved aerodynamic objective parameter (17 seconds longer MCF after rehabilitation), acoustic parameters (shimmer, APQ, NHR), and the parameters evaluated in videostroboscopy. Presented case study indicates to the usefulness a comprehensive diagnosis of paralytic dysphonia and complex assessment of the effectivness of voice therapy. [ABSTRACT FROM AUTHOR]