How is PKS confirmed genetically?

Karyotype of peripheral blood leukocytes may miss PKS due to tissue-limited mosaicism; FISH/CGH array on skin fibroblasts (biopsy required) has higher sensitivity; prenatal CVS more sensitive than amniocentesis for detecting i(12p).

What degree of intellectual disability occurs in PKS?

Severe-profound intellectual disability in the majority; language limited or absent; behavioral features include periods of laughing/crying, social engagement, and tactile sensitivity; some show slow progress in educational settings.

What epilepsy burden is expected in PKS?

Epilepsy in >60% of PKS; infantile spasms are most common onset; multiple seizure types develop over time; typically pharmacoresistant; EEG shows diffuse or multifocal abnormalities; VNS or dietary therapies may provide partial benefit.

What cardiac defects occur in PKS?

CHD in 30-40%: ASD, VSD, AVSD, and complex heart disease; echocardiogram at diagnosis; diaphragmatic hernia in 25-40% (often left-sided, may be prenatal presentation); respiratory management may be the primary neonatal challenge.

What skin findings suggest PKS diagnosis?

Streaks of hyperpigmentation and hypopigmentation (Blaschkoid distribution) from mosaicism; coarse facial features, frontal bossing, alopecia at temples/eyebrows (sparse temporal hair); supernumerary nipples; perioral pigmentation.

Pallister-Killian Syndrome Clinical Severity Assessment

Assesses Pallister-Killian syndrome (tetrasomy 12p) severity using intellectual disability level, epilepsy burden, structural heart disease, and skin pigmentation pattern to guide multidisciplinary management.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

Each component has a specific meaning:

Intellectual disability level — The intellectual disability level recorded for the scenario being assessed.
Epilepsy burden — The epilepsy burden recorded for the scenario being assessed.
Structural heart disease — The structural heart disease recorded for the scenario being assessed.
Skin pigmentation pattern — The skin pigmentation pattern recorded for the scenario being assessed.

Note: Interpret the pks severity result against the thresholds and context described above.

How to Use

Enter the intellectual disability level, epilepsy burden, structural heart disease, skin pigmentation pattern for the scenario you are assessing. Assesses Pallister-Killian syndrome (tetrasomy 12p) severity using intellectual disability level, epilepsy burden, structural heart disease, and skin pigmentation pattern to guide multidisciplinary management. Use the pks severity result to inform your calculation.

Related Calculators

Angelman Severity

Medical Calculators

CHARGE Criteria