Abstract
Although many pathological changes in the internal capsule may lead to neurological deficits, we often encounter ill-defined focal low attenuation in the posterior limb of the internal capsule (PIC) on CT in patients with no neurological disturbance. Brain CT studies of 141 patients without neurological deficites were reviewed to investigate the position of the focal low attenuation by analysis of a profile density curve. Nine patients with lacunar infarcts only within the posterior internal capsule were also studied. The focal low attenuation areas were ill-defined and bilaterally symmetrical, without mass effect. They were seen consistently within the posterior limb of the posterior internal capsule. Correlation between the distribution of these foci and the position of lacunar infarcts in the posterior internal capsule in nine patients with neurological deficits suggests that they may be related to the corticospinal tract.
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References
Brown JJ, Hesselink JR, Rothrock JF (1988) MR and CT of lacnar infarcts. AJNR 9:477–482
Takahashi S, Kawada Y, Uemura K (1980) CT finding on anterior choroidal artery occlusion. Rinsho Hoshasen 25:575–581
Braffman BH, Zimmerman RA, Trojanowski JQ, Gonatas NK, Hickey WF, Schlaepfer WW (1988) Brain MR: pathologic correlation with gross and histopathology. 1. Lacunar infarction and Virchow-Robin spaces. AJNR 9: 621–628
Bryan RN, Levy LM, Whitlow WD, Killan JM, Preziosi TJ, Tosario JA (1991) Diagnosis of acute cerebral infarction: comparison of CT and MR imaging. AJNR 12:611–620
Nesbit GM, Forbes GS, Scheithauer BW, Okazaki H, Rodriguez M (1991) Multiple sclerosis: histopathologic and MR and/or CT correlation in 37 cases at biopsy and three cases at autopsy. Radiology 180:467–474
Mark AS, Aylas SW (1989) Progressive multifocal leukoencephalopathy in patients with AIDS: appearance on MR images. Radiology 173:517–520
Thajeb P, Chen ST (1989) Cranial computed tomography in acute disseminated encephalomyelitis. Neuroradiology 31:8–12
Andreula CF, Blasi RD, Carella A (1991) CT and MR studies of methylmalonic acidemia. AJNR 12:410–412
Endo M, Ichikawa F, Miyasaka Y, Yada K, Ohwada T (1991) Capsular and thalamic infarction caused by tentorial herniation subsequent to head trauma. Neuroradiology 33:296–299
Gentry LR, Godersky JC, Thompson BH (1989) Traumatic brain stem injury: MR imaging. Radiology 171:177–187
Mirvis SE, Wolf AL, Numaguchi Y, Corradino G, Joslyn JN (1990) Post traumatic cerebral infarction diagnosed by CT: prevalence, origin, and outcome. AJNR 11:355–360
Mirowtz S, Sartor K, Gado M, Torack R (1989) Focal signal-intensity variations in the posterior internal capsule: normal MR findings and distinction from pathologic findings. Radiology 172:535–539
Curnes JT, Burger PC, Djang WT, Boyko OB (1988) MR imaging of compact white matter pathways. AJNR 9:1061–1068
Yagishita A, Nakano I, Oda M, Hirano A (1994) Location of corticospinal tract in the internal capsule at MR imaging. Radiology 191:455–460
Hirayama K (1981) Shinkeishokogaku. Bunkodo, Tokyo, pp 960–963
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Adachi, M., Yamaguchi, K. & Hosoya, T. III-defined focal low attenuation in the posterior internal capsule: a normal CT finding. Neuroradiology 38, 124–127 (1996). https://doi.org/10.1007/BF00604795
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DOI: https://doi.org/10.1007/BF00604795