Persistent pupillary membrane
Name = PAGENAME
ICD10 = ICD10|H|21|4|h|15
Persistent pupillary membrane (PPM) is a condition of the
eyeinvolving remnants of a fetal membrane that persist as strands of tissue crossing the pupil. The pupillary membrane in mammals exists in the fetusas a source of blood supply for the lens. It normally atrophies from the time of birth to the age of four to eight weeks.cite book|author=Gelatt, Kirk N. (ed.)|title=Veterinary Ophthalmology|edition=3rd ed.|publisher=Lippincott, Williams & Wilkins|year=1999|id=ISBN 0-683-30076-8] PPM occurs when this atrophy is incomplete. It generally does not cause any symptoms. The strands can connect to the corneaor lens, but most commonly to other parts of the iris. Attachment to the cornea can cause small corneal opacities, while attachment to the lens can cause small cataracts. Using topical atropineto dilate the pupil may help break down PPMs.
In dogs, PPM is inherited in the
Basenjibut can occur in other breeds such as the Pembroke Welsh Corgi, Chow Chow, Mastiff, and English Cocker Spaniel. It is also rarely seen in cats, horses, and cattle.
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