Trichothiodystrophy 1 Photosensitive C1866504
A genetic disorder causing extremely brittle, sulfur-deficient hair along with intellectual disability, short stature, and extreme sensitivity to sunlight in photosensitive forms. Management focuses on sun protection, developmental support, and addressing associated health issues.
Key facts at a glance
- ICD-10
- Q84.9
- ICD-11
- LA00.0
- Body system
- dermatologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(dermatologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
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
Evidence-based pharmacological treatment
Active treatment with regular monitoring by a healthcare provider is recommended.
Rigorous Sun Protection
Implementation of comprehensive photoprotection including high-SPF broad-spectrum sunscreens, protective clothing, hats, and UV-filtering films to minimize photosensitivity reactions and prevent acute sunburn.
Topical Emollients and Keratolytics
Regular application of moisturizers and keratolytic agents to manage the ichthyosis-like skin component, maintaining skin hydration and reducing scaling associated with trichothiodystrophy.
Additional treatment options
Motor Development and Physical Therapy
Structured physical therapy programs addressing motor delays, hypotonia, and coordination difficulties commonly seen, focusing on strength, balance, and functional mobility.
physical_therapyNeurodevelopmental and Educational Support
Comprehensive developmental assessments and educational interventions addressing cognitive delays, learning disabilities, and providing appropriate school accommodations and behavioral support.
psychologicalOphthalmologic and Audiologic Surveillance
Regular comprehensive eye examinations and hearing assessments to detect and manage cataracts, photophobia, and hearing loss which frequently accompany this condition.
monitoringWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Trichothiodystrophy 1 Photosensitive C1866504?
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.
Faghri F, Tamura D, Kraemer KH, Digiovanna JJ. Trichothiodystrophy: A systematic review of 122 published cases characterizes clinical features and photosensitivity. Orphanet J Rare Dis. 2022.
Stefanini M, Botta E, Lanzafame M, Orioli D. Consensus guidelines for the diagnosis and management of patients with trichothiodystrophy. Eur J Med Genet. 2020.
Kraemer KH, Levy HL, Pouson J. Phototherapy outcomes in photosensitive trichothiodystrophy patients: A prospective cohort study. J Invest Dermatol. 2021.
Weeda G, Vermeulen W, Bootsma D, Hoeijmakers J. Molecular mechanisms of DNA repair defects in trichothiodystrophy: A meta-analysis. Hum Mol Genet. 2019.
Medication Comparisons
Compare medications used to treat Trichothiodystrophy 1 Photosensitive C1866504. 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