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American Journal of Neuroradiology 25:1283-1285, August 2004
© 2004 American Society of Neuroradiology

Case Report
PEDIATRICS

Pre- and Postnatal MR Imaging of Hypothalamic Hamartomas Associated with Arachnoid Cysts

Timothy N. Bootha, Charles Timmonsb, Kenneth Shapiroc and Nancy K. Rollinsa

a Departments of Radiology, Children’s Medical Center of Dallas and University of Texas Southwestern Medical Center, Dallas, TX
b Departments of Pathology, Children’s Medical Center of Dallas and University of Texas Southwestern Medical Center, Dallas, TX
c Departments of Neurosurgery, Children’s Medical Center of Dallas and University of Texas Southwestern Medical Center, Dallas, TX

Address correspondence to Timothy N. Booth, Department of Radiology, Children’s Medical Center of Dallas, 1935 Motor Street, Dallas, TX 75235

Summary: We describe two cases of hypothalamic hamartoma associated with arachnoid cysts. One case was initially documented on prenatal MR images. Because of the rarity of the association and resultant distortion in regional anatomy, the solid component of the mass may be overlooked. This would certainly be true when using lower-resolution diagnostic studies such as fetal MR imaging. The lesion could also be confused with a cystic tumor such as pilocytic astrocytoma. Thorough evaluation is required in patients with precocious puberty, gelastic seizures, and the presence of a suprasellar arachnoid cyst.




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Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X