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Rothmund-Thomson syndrome type 2 is a subform of Rothmund-Thomson syndrome (RTS) presenting with a characteristic facial rash (poikiloderma) and frequently associated with short stature, sparse scalp hair, sparse or absent eyelashes and/or eyebrows, congenital bone defects and an increased risk of osteosarcoma in childhood and squamous cell carcinoma later in life.
Features include always present findings: Epicanthus, Delayed eruption of teeth, Short stature, and Hypertelorism and others; and very common findings: Frontal bossing. 55 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Eyes | 4 | Strabismus, Zonular cataract, Cataract |
RECQL4 function has not been fully characterized.
Rothmund-Thomson syndrome type 2 is associated with mutations in the RECQL4 gene on chromosome 8.
No genotype-phenotype correlations have been identified.
Rothmund-Thomson syndrome (RTS) should be suspected in individuals with the classic rash of RTS.
Acute phase
Starts in infancy, usually between ages three and six months
Erythema on the cheeks and face
Spreads to involve the extensor surfaces of the extremities
No approved treatments are currently available for Rothmund-Thomson syndrome type 2. The disease remains an area of unmet medical need.
Evaluations Following Initial Diagnosis To establish the extent of disease and needs in an individual diagnosed with Rothmund-Thomson syndrome (RTS), the evaluations (if not performed as part of the evaluation that led to the diagnosis) are recommended. Table 3. Recommended Evaluations Following Initial Diagnosis in Individuals with Rothmund-Thomson Syndrome (RTS)
Table 5. Recommended Surveillance for Individuals with Rothmund-Thomson Syndrome (RTS)
System/Concern |
|---|
No clinical trials have been registered for Rothmund-Thomson syndrome type 2.
6 publications have been identified in PubMed for Rothmund-Thomson syndrome type 2. Research spans Case Report / Case Series (80%) and Diagnostic / Biomarker (20%).
Armas Samaniego MI (2026). [PMID: 41737240](https://pubmed.ncbi.nlm.nih.gov/41737240/). *Frontiers in pediatrics*. [Case Report / Case Series]
Genç A (2026). [PMID: 41628607](https://pubmed.ncbi.nlm.nih.gov/41628607/). *Klinische Padiatrie*. [Case Report / Case Series]
Sama AD (2025). [PMID: 40025372](https://pubmed.ncbi.nlm.nih.gov/40025372/). *Archives of dermatological research*. [Diagnostic / Biomarker]
Cabete S (2025). [PMID: 41333505](https://pubmed.ncbi.nlm.nih.gov/41333505/). *Cureus*. [Case Report / Case Series]
Teferedegn E (2025). [PMID: 40485636](https://pubmed.ncbi.nlm.nih.gov/40485636/). *American journal of medical genetics. Part A*. [Case Report / Case Series]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 9:41 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Rothmund-Thomson syndrome type 2
4 |
Telangiectasia, Nail dystrophy, Alopecia |
Bones and joints | 3 | Kyphoscoliosis, Osteosarcoma, Weak and brittle bones (osteoporosis) |
Arms and legs | 2 | Short foot, Small hand |
Brain and nerves | 2 | Intellectual disability, Depressed nasal bridge |
Head and neck | 2 | High palate, Mandibular prognathia |
Pregnancy and birth | 1 | Congenital hip dislocation |
Growth and development | 1 | Short stature |
Muscles | 1 | Dermal atrophy |
Hormones | 1 | Hypogonadism |
Age of onset: adolescence, at birth, adulthood, childhood.
Rothmund-Thomson syndrome (RTS) is a genetic disorder associated with a characteristic skin rash in combination with certain other findings detailed in this section. One subset of affected individuals defined by the lack of RECQL4 pathogenic variants (historically referred to as type 1 RTS) is predisposed to developing juvenile cataracts but not osteosarcoma when followed over time. The other, larger subset of individuals with RTS and RECQL4 pathogenic variants (historically referred to as type 2 RTS) is at increased risk of developing osteosarcoma and other cancers, and these individuals are also more likely to have skeletal abnormalities .
Source: GeneReviews — "Rothmund-Thomson Syndrome"
Typically sparing of the trunk and abdomen; possible involvement of the buttocks
Chronic phase
Gradually develops over a period of months to years
Reticulated hyper- and hypopigmentation, telangiectasias, and areas of punctate atrophy (i.e., poikiloderma)
Persists throughout life
If the rash is atypical (either in appearance, distribution, or pattern of onset and spread), a diagnosis of probable RTS can be made if two of the following additional features of RTS are present:
Source: GeneReviews — "Rothmund-Thomson Syndrome"
The differential diagnosis of Rothmund-Thomson syndrome (RTS) includes the disorders summarized in , which can exhibit features of poikiloderma but are otherwise clinically distinct from RTS.
Table 2.
Disorders That Can Exhibit Features of Poikiloderma to Consider in the Differential Diagnosis of Rothmund-Thomson Syndrome (RTS)
Disorder | Gene(s) | MOI | Overlapping Clinical Features of Disorder | Distinguishing Clinical Features of Disorder
Bloom syndrome1 | BLM | AR | • Rash characterized by an erythematous, sun-sensitive lesion of the face; not true poikiloderma
Source: GeneReviews — "Rothmund-Thomson Syndrome"
Genetic testing for RECQL4 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Rothmund-Thomson syndrome type 2 has been reported in the published literature.
System/Concern | Evaluation | Comment |
|---|---|---|
Skin | Dermatologic eval | — |
Skeletal | Baseline skeletal radiographic exam by age 5 yrs to identify underlying skeletal abnormalities; baseline DXA scan to assess bone mineral density if indicated | Obtain DXA if osteopenia is seen on skeletal survey or there is a history of fractures. |
Hematologic | Baseline CBC w/differential | Individuals w/clinical evidence of anemia or cytopenias should be evaluated by CBC bone marrow biopsy if clinically indicated. |
Vision | Ophthalmologic exam to evaluate for cataracts | — |
Other | Consultation w/clinical geneticist /or genetic counselor | CBC = complete blood count; DXA = dual-energy x-ray absorptiometry Treatment of Manifestations Table 4. |
Treatment of Manifestations in Individuals with Rothmund-Thomson Syndrome (RTS) Manifestation/Concern | Treatment | Considerations/Other |
Skin rash | Pulsed dye laser has been used for cosmetic management of the telangiectatic component of rash. | — |
Hematologic concerns | Individuals w/hematologic abnormalities should be treated in standard manner by hematologist familiar w/RTS. | — |
Cataract | Visually significant cataracts require surgical removal. | — |
Cancer | Affected individuals who develop cancer should be treated per standard chemotherapy /or radiation regimens. | Doses should be modified only if individual experiences significantly toxicities. Surveillance Table 5. |
Recommended Surveillance for Individuals with Rothmund-Thomson Syndrome (RTS) System/Concern | Evaluation | Frequency |
General | Eval by physician familiar w/RTS for overall health maintenance monitoring of growth | Annual |
Skin | Eval by dermatologist w/close monitoring of skin for lesions w/unusual color or texture, as individuals w/RTS are at risk for skin cancers | Annually or more frequently if indicated Eyes (for those |
w/o cataracts) | Eye exams for screening purposes | Annually |
Skeletal1 | Skeletal radiographic exam | Promptly if clinical suspicion of osteosarcoma is present (incl bone pain, swelling, or enlarging lesion on a limb) due to the high risk for this potentially lethal malignancy 1. Surveillance screening for osteosarcoma is not routinely recommended for individuals with RTS . |
Source: GeneReviews — "Rothmund-Thomson Syndrome"
Exposure to heat or sunlight may exacerbate the rash in some individuals. Avoidance of excessive sun exposure decreases the risk for skin cancer. Given the theoretic potential for tumorigenesis, growth hormone (GH) therapy is not recommended for individuals with normal GH levels. For individuals with documented GH deficiency, standard treatment with growth hormone is appropriate.
Source: GeneReviews — "Rothmund-Thomson Syndrome"
Search ClinicalTrials.gov in the US and EU Clinical Trials Register in Europe for access to information on clinical studies for a wide range of diseases and conditions. Note: There may not be clinical trials for this disorder.
Source: GeneReviews — "Rothmund-Thomson Syndrome"
View trials for Rothmund-Thomson syndrome type 2
Evaluation
Frequency |
|---|
General | Eval by physician familiar w/RTS for overall health maintenance monitoring of growth | Annual |
Skin | Eval by dermatologist w/close monitoring of skin for lesions w/unusual color or texture, as individuals w/RTS are at risk for skin cancers | Annually or more frequently if indicated Eyes (for those |
w/o cataracts) | Eye exams for screening purposes | Annually |
Skeletal1 | Skeletal radiographic exam | Promptly if clinical suspicion of osteosarcoma is present (incl bone pain, swelling, or enlarging lesion on a limb) due to the high risk for this potentially lethal malignancy 1. Surveillance screening for osteosarcoma is not routinely recommended for individuals with RTS . |
Source: GeneReviews — "Rothmund-Thomson Syndrome"
Phenotype severity distribution: 14 always present features, 1 very common feature, 11 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).