硝子体中に浮遊する網膜血管を認めた家族性滲出性硝子体網膜症の1例

Floating retinal vessel in the vitreous in an eye of familial exudative vitreoretinopathy

　家族性滲出性硝子体網膜症と診断された1歳の男児の左眼に異常血管を発見した。下耳側静脈が黄斑の耳側で硝子体腔内に浮遊し，体位の変動により，この血管の位置は移動した。眼底周辺部に線維組織と滲出斑を伴う無血管領域があり，浮遊血管はこの線維組織に連結していた。硝子体内の線維増殖組織が瘢痕化するのに伴って後部硝子体剥離が生じ，増殖膜に癒着していた網膜血管が牽引されたと推定された。

We observed a pathological vessel in the left eye of a one-year-old male infant diagnosed as familial exudative vitreoretinopathy, FEVR. A part of inferior temporal retinal vein was floating in the vitreous temporal to the macula. This floating vessel changed its course along with changes in the eye position. An avascular zone was present in the peripheral fundus associated with fibrovascular tissue and retinal exudates. The floating vessel was connected with the fibrovascular tissue. It appeared that posterior vitreous detachment developed secondary to cicatrization of fibrovascular tissue resulting in traction of the retinal vessel adherent to it.