visitor # 1 since May 2003
JN : AJR Am J Roentgenol. 2007 Apr;188(4):W348-54.
TI : Retinacula of the foot and ankle: MRI with anatomic correlation in cadavers.
AU : Numkarunarunrote N, Malik A, Aguiar RO, Trudell DJ, Resnick D.
EN-AB: OBJECTIVE: The retinacula of the ankle are regions of localized thickening of superficial aponeurosis that provide mechanical strength to prevent tendon bowstringing. The purpose of this study was to define the foot and ankle retinacula as seen on MRI with anatomic correlation in cadavers. MATERIALS AND METHODS: Ten fresh foot and ankle specimens from humans were imaged with 1.5-T MRI. T1- and intermediate-weighted images were obtained in the axial, coronal, and sagittal planes. Specimens then were sectioned into 3-mm-thick sections in either the axial or the coronal plane to correspond with the MR images. Two radiologists interpreted the MR images and sections by consensus for the anatomic landmarks and best imaging planes for identification of the retinacula and discernment of their shape, thickness, and relations to adjacent tendons. RESULTS: Normal retinacula of the ankle appeared as bands of low signal intensity in both MRI sequences. The bony landmarks were helpful in localization of the attachment sites of the retinacula. The superior extensor retinaculum and superior and inferior peroneal retinacula were optimally visualized on axial images. Their thicknesses averaged 0.9, 1.0, and 0.8 mm, respectively. The flexor retinaculum and three root components (medial, intermediate, and lateral) of the stem ligament of the inferior extensor retinaculum were well seen in the coronal plane. The average thicknesses of these structures were 0.9, 1.5, 1.0, and 0.9 mm, respectively. CONCLUSION: MRI in standard orthogonal planes is a useful technique for visualizing the attachment sites, signal intensity, and normal thickness of foot and ankle retinacula. (NO 17377003)
JN : J Med Assoc Thai. 2004 Sep;87 Suppl 2:S152-60.
TI : MR imaging of CNS leiomyosarcoma in AIDS patients.
AU : Lerdlum S, Lalitanantpong S, Numkarunarunrote N, Chaowanapanja P, Suankratay C, Shuangshoti S.
EN-AB: Leiomyosarcomas of the central nervous system are extremely rare; however they are becoming more prevalent in immunocompromised patients. The authors present MRI (Magnetic Resonance Imaging) of six cases of pathological proved leiomyosarcomas of the central nervous system in patients infected with human immunodeficiency virus. MR images of 4 cases of intraspinal leiomyosarcoma showed lobulated masses expanding multilevel of neural foramina with extradural and intradural extension, giving dumbbell appearance which mimic neurofibroma. Two cases of intracranial leiomyosarcoma revealed a mass at the left cavernous sinus involving prepontine cistern in one case and two lesions in the other case showing masses with dural based appearance at the region of the planum sphenoidale and the posterior aspect of the falx cerebri which mimiced a meningioma. The leiomyosarcoma should be included in the differential diagnosis of extra-axial CNS lesions in HIV-infected patients. (NO 16083180)
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