Are Retinal Spots (CHRPE) a Sign of FAP? What to Know

If your eye doctor noticed spots or freckles on your retina during a routine exam, you might be worried about what it means for your health. These spots are medically known as Congenital Hypertrophy of the Retinal Pigment Epithelium (CHRPE). Having one of these spots does not automatically mean you have Familial Adenomatous Polyposis (FAP), and conversely, the absence of these spots does not guarantee you are free of FAP ^[1][2]. However, the number, shape, and location of these spots can provide important clues that may warrant further medical evaluation ^[1][3].

What is CHRPE?

CHRPE (pronounced “chirpy”) is a flat, pigmented spot (often called a “lesion” by doctors) on the retina, which is the light-sensitive tissue at the back of the eye. Most of the time, these spots are completely harmless and are discovered by chance during a routine eye exam ^[4]. Importantly, CHRPE spots are not eye cancer, usually do not cause any symptoms, and have little to no impact on your vision ^[4][5].

When Are Retinal Spots a Sign of FAP?

The connection between CHRPE and FAP depends heavily on the pattern of the spots found by an eye specialist:

• Single Spots: A single, solitary CHRPE spot in one eye is relatively common in the general population and is typically benign and unrelated to FAP ^[1][6].
• Multiple or Bilateral Spots: If you have multiple spots (often three or more) or spots in both eyes (bilateral), this pattern raises clinical suspicion and warrants professional assessment ^[2][7][3]. FAP-associated spots may also have irregular borders, oval shapes, or specific lighter areas within them ^[8][6].

While multiple or bilateral spots are a recognized clue for FAP, they are not a definitive diagnosis. You can have these spots without having an APC gene mutation (the genetic change responsible for most classic FAP) ^[2]. On the other hand, you can still have FAP-associated retinal spots even if you have no family history of colon polyps (growths in the colon lining) or colorectal cancer. This happens because the genetic mutation can occur de novo, meaning it is a new genetic change that happened in you and was not inherited from either parent ^[9][3].

If You Already Have FAP

If you have already been diagnosed with Familial Adenomatous Polyposis, the presence of CHRPE spots is simply an associated physical feature of the condition. Having these spots does not mean your FAP is more severe, nor does it indicate how many colon polyps you have. The spots do not replace or change your established gastrointestinal surveillance plan, and routine eye care should continue according to your ophthalmologist’s advice.

Next Steps to Consider

If an eye doctor identifies a suspicious pattern of CHRPE spots, this finding should prompt discussion with a specialized clinician, even if you feel perfectly healthy and have no gastrointestinal symptoms ^[3][9].

The typical evaluation pathway includes:

• Confirmation by an Eye Specialist: An ophthalmologist or retinal specialist should carefully examine the spots to confirm their exact characteristics ^[1][10].
• Genetic Counseling and Testing: A genetic counselor can help you decide if you need a multigene blood test to look for an APC mutation or other hereditary conditions. Keep in mind that a negative genetic test does not always rule out the need for physical screenings ^[7][3].
• Gastrointestinal Evaluation: You may be referred to a gastroenterologist. Depending on your age, family history, and genetic test results, they may recommend a colonoscopy to examine your colon for polyps ^[9][11]. In some reported cases, patients without any gastrointestinal symptoms or family history were found to have extensive polyposis after their eye findings led to a colonoscopy ^[9][3].

While an eye exam cannot diagnose FAP on its own, it can be a vital piece of the puzzle in identifying your risk and guiding you toward proper care ^[7][2].