====== q9985 ======
A 61-year-old woman admitted for a left [[basal ganglia tumor]].

She was biopsied twicewith inconclusive results.
The NMR  showed progression of the lesion, which went from a diffuse signal change in the [[corpus callosum]] and bilateral [[frontal lobe]] to the addition of an annular uptake zone at the level of the left GGBB.
The patient clinically presents with [[abulia]] and right [[hemiparesis]] 2/5 MSD and 3/5 MID that is slowly getting worse.
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Studies have shown that in 2-15% of cases a [[pathologic diagnosis]] is not achieved
((Bernays RL, Kollias SS, Khan N, Brandner S, Meier S, Yonekawa Y. [[Histological yield]], complications, and technological considerations in 114 consecutive [[frameless]] [[stereotactic biopsy]] procedures aided by open intraoperative magnetic resonance imaging. J Neurosurg. 2002;97:354–62.))
((Fountas KN, Kapsalaki EZ, Smisson HF, 3rd, Hartman LP, Johnston KW, Robinson JS Jr. Results and complications from the use of a frameless stereotactic microscopic navigator system. Stereotact Funct Neurosurg. 1998;71:76–82.))
((Gralla J, Nimsky C, Buchfelder M, Fahlbusch R, Ganslandt O. Frameless stereotactic brain biopsy procedures using the Stealth Station: Indications, accuracy and results. Zentralbl Neurochir. 2003;64:166–70.))
((Heper AO, Erden E, Savas A, Ceyhan K, Erden I, Akyar S, Kanpolat Y, et al. An analysis of stereotactic biopsy of brain tumors and nonneoplastic lesions: A prospective clinicopathologic study. Surg Neurol. 2005;64(Suppl 2):S82–88))