Persistent Fetal Vasculature

Persistent fetal vasculature (PFV), historically called persistent hyperplastic primary vitreous, is a congenital developmental anomaly in which the fetal blood-vessel system that normally nourishes the developing lens and vitreous fails to regress and instead persists after birth. The retained vascular tissue can disturb the lens, the vitreous cavity, and the retina, producing a spectrum of disease that ranges from a trivial remnant to a malformed, blind eye, usually in one eye.

Definition

Persistent fetal vasculature is a congenital disorder resulting from incomplete regression of the embryonic hyaloid vascular system and tunica vasculosa lentis, leaving persistent fibrovascular tissue in the lens, vitreous, or retina that can impair the development and function of the affected eye.

Scope

This entry covers the developmental basis of PFV in failed regression of the embryonic ocular vasculature, its anterior and posterior forms and their associated findings, and the broad evidence on how the condition presents and is classified. It is framed as a reference topic within pediatric and congenital eye disease and is not clinical guidance.

Key concepts

• Hyaloid vascular system and its normal regression
• Tunica vasculosa lentis
• Anterior PFV (retrolental membrane, lens involvement)
• Posterior PFV (vitreous stalk, retinal involvement)
• Combined anterior and posterior forms
• Unilaterality and microphthalmos
• Differential diagnosis of leukocoria

Mechanisms

During fetal development a transient vascular network—the hyaloid artery, vasa hyaloidea propria, and tunica vasculosa lentis—supplies the growing lens and vitreous and then regresses before birth. In PFV this regression is incomplete, so fibrovascular remnants persist. Goldberg's integrated account reframed the condition as a single disorder of persistent fetal vasculature with anterior and posterior expressions: anterior involvement centers on a retrolental fibrovascular membrane and lens abnormalities, while posterior involvement features a vitreous stalk running from the optic disc and retinal abnormalities such as folds or dysplasia. The persistent tissue can mechanically distort ocular structures and, because it disrupts the developing eye, is commonly associated with a small (microphthalmic) globe.

Clinical relevance

PFV is described here as a model congenital anomaly of failed vascular regression and as an important consideration in the differential diagnosis of a white pupillary reflex (leukocoria) in infancy, which it shares with other serious conditions. The entry explains the spectrum and classification for reference purposes and is not a basis for diagnosing or managing an individual child.

Epidemiology

PFV is uncommon and is typically unilateral and not inherited, though bilateral and syndromic cases occur. It is one of the recognized causes of congenital leukocoria and unilateral congenital cataract or microphthalmos, and its visual prognosis depends on the extent of anterior and posterior involvement.

Evidence & guidelines

Understanding of PFV rests largely on descriptive and interpretive work, of which Goldberg's Edward Jackson Memorial Lecture is the unifying reference, supplemented by later review syntheses and standard pediatric ophthalmology texts such as Taylor and Hoyt's. Evidence on outcomes is observational rather than from randomized trials.

History

The condition was long described under the name persistent hyperplastic primary vitreous, emphasizing the retained vitreous tissue. Goldberg's 1997 Edward Jackson Memorial Lecture argued that the various anterior and posterior findings are manifestations of a single underlying failure of the fetal ocular vasculature to regress, and proposed 'persistent fetal vasculature' as the more accurate and unifying term now widely used.

Key figures

• Morton F. Goldberg

Seminal works

• goldberg-1997
• bohra-pfv-2019

Frequently asked questions

What is the difference between 'persistent fetal vasculature' and 'persistent hyperplastic primary vitreous'?

They refer to the same condition. 'Persistent hyperplastic primary vitreous' is the older term; 'persistent fetal vasculature' was proposed to reflect that the disorder is a failure of the whole fetal ocular vascular system to regress, not just of the primary vitreous, and it better captures the anterior and posterior forms.

Why does persistent fetal vasculature matter in an infant with a white pupil?

A white pupillary reflex (leukocoria) in an infant has several serious causes, and PFV is one of them. Recognizing it is part of evaluating leukocoria, which is why it is discussed alongside other congenital eye conditions rather than in isolation.