title: Homonymous Quadrantanopsia as the First Manifestation of Cerebral Metastasis of Invasive Mole: a case report.
abstract: BACKGROUND
  Homonymous quadrantanopsia results from retrochiasmal lesions in the visual pathway. Invasive mole is a benign tumor that arises from myometrial invasion of a hydatidiform mole via direct extension through tissue or venous channels. Cerebral metastasis of invasive mole is rare and there has been no report demonstrating homonymous quadrantanopsia as the first manifestation of metastasis in any trophoblastic neoplasms.
  
  
  METHODS
  We report the case of a 31-year-old Asian woman who presented with right homonymous inferior quadrantanopsia from the mass effect of a solitary cerebral metastasis from an invasive mole. A magnetic resonance image (MRI) of the brain showed a metastatic tumor in the left occipital lobe. The visual field improved slightly after chemotherapy. There was a reduction in the tumor size and the surrounding edema. This is the first case report demonstrating that homonymous quadrantanopsia should be included in the manifestations of the metastasis of an invasive mole.
  
  
  CONCLUSIONS
  The presentation of homonymous quadrantanopsia must alert ophthalmologists to conduct a complete medical history and arrange specialist consultation.
authors.affiliation: Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 1# Shuaifuyuan, Beijing 100730, China. yzhong_eye@yahoo.com.cn.
authors.forename: De-Lu
authors.initials: DL
authors.lastname: Song
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhong
authors.forename: Feng
authors.initials: F
authors.lastname: Feng
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Meng-Hui
authors.initials: MH
authors.lastname: Li