Brain (1985) 108, 535-536 MAGNETIC RESONANCE IMAGING (MRI, NMR) SCAN IN A CASE OF CALLOSAL APRAXIA AND PSEUDONEGLECT by R. T. WATSON, K. M. HEILMAN and D. BOWERS (From the Department of Neurology, College of Medicine, University of Florida, and the Veterans Administration Medical Center, Gainesville, Florida, USA) We reported a patient with isolated apraxia of the left hand from a spontaneous callosal disconnection (Watson and Heilman 1983). This patient supported Liepmann's concept that the left hemisphere is dominant for action. She also showed pseudoneglect and this was reported in another study (Heilman et al., 1984). Multiple CT scans demonstrated infarction of most of the body of the corpus callosum with sparing of the genu, the posterior one-fourth to one-fifth of the body and the splenium. There was no evidence of cortical damage by CT scan. We FIG. Sagittal MRI scan demonstrating infarction of most of the body of the corpus callosum. 536 R. T. WATSON AND OTHERS recently obtained an MRI scan on this patient {see fig.) that confirms the CT localization more precisely. REFERENCES HEILMAN K M, BOWERS D, WATSON R T (1984) Pseudoneglect in a patient with partial callosal disconnection. Brain, 107, 519-532. WATSON R T, HEILMAN K M (1983) Callosal apraxia. Brain, 106, 391-403.