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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 26:96-99, January 2005
© 2005 American Society of Neuroradiology

Case Report
HEAD AND NECK

Parapharyngeal Neuroglial Heterotopia Presenting as a Growing Single Locular Cyst: MR Imaging Findings

Chia-Yuen Chen^a, Jen-Hung Huang^b, Wai-Man Choi^a, Chi-Long Chen^c and Wing P. Chan^a,d

^a Department of Radiology, Taipei Medical University—Municipal Wan Fang Hospital, Taipei, Taiwan, Republic of China
^b School of Medicine, Taipei Medical University, Taipei, Taiwan, Republic of China
^c Department of Pathology, School of Medicine, Taipei Medical University, Taipei, Taiwan, Republic of China
^d Department of Radiology, School of Medicine, Taipei Medical University, Taipei, Taiwan, Republic of China

Address correspondence to Wing P. Chan, MD, Department of Radiology, Taipei Medical University-Municipal Wan Fang Hospital, 111, Hsing-Long Road, Section 3, Taipei 116, Taiwan, Republic of China

Summary: Heterotopic brain presenting as a giant, growing, single locular cyst at the parapharyngeal space has not been reported before, to our knowledge. We present such a case, with MR imaging findings, in a 13-month-old girl. A well-demarcated giant cystic mass was noted in the left parapharyngeal space from the skull base to the submandibular region. Airway compression and deformity of the left mandible with subluxation of the temporomandibular joint were noted. The cyst contained a clear fluid that was isointense to CSF with all pulse sequences. Wall enhancement was noted on contrast-enhanced T1-weighted images. No connection to intracranial structures was noted. Histologic findings were compatible with neuroglial heterotopia.