BACKGROUND AND PURPOSE: Some patients who undergo surgical resection of portions of the supplementary motor area (SMA) have severe postoperative motor and language deficits, whereas others have no deficits. We tested the hypothesis that in some patients with lesions affecting the SMA, the contralateral SMA exhibits some of the activation normally associated with the ipsilateral SMA. METHODS: Functional MR imaging studies in seven healthy volunteers and 19 patients with frontal lobe tumors or arteriovenous malformations were reviewed retrospectively. The hemisphere in which the SMA activation predominated was tabulated for right and left motor tasks. The relative hemispheric dominance in the SMA for the right and left motor tasks was compared in the healthy and patient groups and with the location of the lesion in the patient group. RESULTS: None of the control subjects performing a right hand motor task activated predominantly the right SMA. Fifty percent of the patients with lesions overlapping the left SMA performing the right motor task activated predominantly the right SMA. Fifty-seven percent of control subjects performing the left hand motor task activated the left SMA predominantly. One hundred percent of patients with lesions overlapping the right frontal SMA performing the left motor task activated the left SMA predominantly. Differences between patients and controls were statistically significant. CONCLUSION: A lesion that contacts or overlaps the SMA is associated with an increased functional MR imaging response within the contralateral SMA.
BACKGROUND AND PURPOSE: Some patients who undergo surgical resection of portions of the supplementary motor area (SMA) have severe postoperative motor and language deficits, whereas others have no deficits. We tested the hypothesis that in some patients with lesions affecting the SMA, the contralateral SMA exhibits some of the activation normally associated with the ipsilateral SMA. METHODS: Functional MR imaging studies in seven healthy volunteers and 19 patients with frontal lobe tumors or arteriovenous malformations were reviewed retrospectively. The hemisphere in which the SMA activation predominated was tabulated for right and left motor tasks. The relative hemispheric dominance in the SMA for the right and left motor tasks was compared in the healthy and patient groups and with the location of the lesion in the patient group. RESULTS: None of the control subjects performing a right hand motor task activated predominantly the right SMA. Fifty percent of the patients with lesions overlapping the left SMA performing the right motor task activated predominantly the right SMA. Fifty-seven percent of control subjects performing the left hand motor task activated the left SMA predominantly. One hundred percent of patients with lesions overlapping the right frontal SMA performing the left motor task activated the left SMA predominantly. Differences between patients and controls were statistically significant. CONCLUSION: A lesion that contacts or overlaps the SMA is associated with an increased functional MR imaging response within the contralateral SMA.
Authors: Thomas A Gallagher; Veena A Nair; Michael F Regner; Brittany M Young; Andrew Radtke; Joshua Pankratz; Ryan L Holdsworth; Dovile Baniulis; Nicole K Kornder; Jed Voss; Benjamin P Austin; Chad Moritz; Elizabeth M Meyerand; Vivek Prabhakaran Journal: Neurosurg Focus Date: 2013-04 Impact factor: 4.047
Authors: Bornali Kundu; Amy Penwarden; Joel M Wood; Thomas A Gallagher; Matthew J Andreoli; Jed Voss; Timothy Meier; Veena A Nair; John S Kuo; Aaron S Field; Chad Moritz; M Elizabeth Meyerand; Vivek Prabhakaran Journal: Neurosurg Focus Date: 2013-04 Impact factor: 4.047
Authors: Vivek Prabhakaran; Veena A Nair; Benjamin P Austin; Christian La; Thomas A Gallagher; Yijing Wu; Donald G McLaren; Guofan Xu; Patrick Turski; Howard Rowley Journal: Neuroimaging Clin N Am Date: 2012-05 Impact factor: 2.264
Authors: Sami Obaid; Hanya M Qureshi; Ayman Aljishi; Neelam Shaikh; Adam J Kundishora; Richard A Bronen; Michael DiLuna; Eyiyemisi Damisah Journal: Neurology Date: 2022-05-26 Impact factor: 11.800