Figure 8c. APA in a 66-year-old woman. Adrenal scintigrams obtained immediately (a), 7 days (b), and 11 days (c) after the administration of NP-59 with the patient prone demonstrate unilateral increased uptake, a finding that was surgically confirmed to represent a left-sided APA. It is worth noting that this study was performed after a long dexamethasone-suppressed period, so that the timing of appearances of unilateral abnormalities does not conform to the interpretative convention outlined by Gross et al (49,50). (Case courtesy of Adil Al-Nahhas, MBBS, FRCP, Hammersmith Hospital, London, England.)