Introduction: Persistent hyperplastic primary vitreous (PHPV) involves a spectrum of congenital ocular abnormalities characterized by the presence of a vascular membrane behind the lens. Retinoblastoma is a life-threatening intraocular malignancy that can cause blindness, eye loss, or even death. PHPV and retinoblastoma are extremely rare prenatal diseases. Case Presentation: Here, we present a case of fetal PHPV with retinoblastoma diagnosed using prenatal ultrasound. The unilateral lenses were hyperechoic, and irregular echogenic bands between the lenses and posterior eye walls were observed. In cases where the blood flow signal continues in the band-shaped hyperechoic area, PHPV with retinoblastoma should be suspected. Conclusion: PHPV with retinoblastoma can be prenatally diagnosed.

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