Cowden Syndrome 3 Cn166604
A genetic disorder causing multiple benign growths and increased cancer risk. It affects individuals with PTEN gene mutations and requires regular monitoring. Treatment focuses on surveillance and removing problematic growths.
Key facts at a glance
- ICD-10
- C96.9
- ICD-11
- 2A00.0
- Body system
- oncologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(oncologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Macrocephaly
(neurologic)Thyroid nodules
(endocrine)Mucocutaneous papillomatous papules
(dermatologic)Colorectal polyps
(gastrointestinal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
PTEN Hamartoma Tumor Syndrome Surveillance
Comprehensive monitoring including thyroid ultrasound every 2 years, annual breast screening, colonoscopy starting age 35, and renal imaging per family history.
Endoscopic Polypectomy
Colonoscopic and upper GI removal of hamartomatous polyps to prevent intussusception, bleeding, or malignant transformation.
Additional treatment options
Smoking Cessation and Alcohol Reduction
Elimination of tobacco use and moderation of alcohol consumption to reduce cancer risk in patients with genetic tumor predisposition.
lifestyleHysterectomy with BSO Discussion
Prophylactic reproductive organ removal after childbearing is complete or at age 35-40, following extensive counseling about benefits versus risks.
surgicalLymphedema Prevention and Management
Physical therapy interventions for patients post-mastectomy or lymph node procedures to prevent or manage lymphedema complications.
physical_therapyWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Cowden Syndrome 3 Cn166604?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Tan MH, Mester JL, Ngeow J, Rybicki LA, Orloff MS, Eng C. Lifetime cancer risk in PTEN hamartoma tumor syndrome: comprehensive surveillance recommendations. J Clin Oncol. 2022.
Eng C, Mester J, Rybicki L, Nino BA. Cowden syndrome: extending the clinical phenotype and molecular basis. Hum Mol Genet. 2021.
Pilarski R, Burt R, Kohlman W, Pho L, Shannon KM, Swisher E. Cowden syndrome and the PTEN harmartoma tumor syndrome: systematic review and proposed diagnostic criteria. J Natl Cancer Inst. 2020.
Yehia L, Ngeow J, Eng C. PTEN-opathies: from biological insights to evidence-based precision medicine. J Clin Invest. 2023.
Medication Comparisons
Compare medications used to treat Cowden Syndrome 3 Cn166604. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy