Short answer · Medically reviewed summary · Last updated: 2026-05-08
Pallister-Killian syndrome, also known as tetrasomy 12p, is a rare genetic disorder characterized by the presence of an abnormal extra chromosome 12 in some, but not all, of the body's cells. It is most commonly referred to by these two names, though it has been historically identified by several eponyms reflecting the researchers who first described its clinical presentation. What are the common synonyms and historical names for Pallister-Killian syndrome? Because Pallister-Killian syndrome was identified independently by different researchers in the late 1970s and early 1980s, it accumulated several names.
Pallister-Killian Syndrome / Tetrasomy 12p synonyms
Other names for Pallister-Killian Syndrome / Tetrasomy 12p: synonyms, acronyms and related terms used by doctors and patients.
Pallister-Killian syndrome, also known as tetrasomy 12p, is a rare genetic disorder characterized by the presence of an abnormal extra chromosome 12 in some, but not all, of the body's cells. It is most commonly referred to by these two names, though it has been historically identified by several eponyms reflecting the researchers who first described its clinical presentation.
What are the common synonyms and historical names for Pallister-Killian syndrome?
Because Pallister-Killian syndrome was identified independently by different researchers in the late 1970s and early 1980s, it accumulated several names. Historical terms you may encounter in older medical literature include:
- Killian-Teschler-Nicola syndrome
- Teschler-Nicola-Killian syndrome
- Pallister mosaic syndrome
- Mosaic tetrasomy 12p
Why does this condition have multiple names?
The variety of names for Pallister-Killian syndrome stems from the era of its discovery, when clinicians often named syndromes after the lead investigators. As our understanding of the underlying genetics improved, the terminology shifted toward descriptive names like tetrasomy 12p, which accurately identifies the presence of four copies of the short arm (p) of chromosome 12. Using both the eponym and the cytogenetic description helps ensure clarity across international medical records.
How is the condition classified in medical databases?
Standardized medical databases use specific identifiers to help clinicians and families find reliable data. When searching for Pallister-Killian syndrome, you will find it indexed under these systems:
- OMIM (Online Mendelian Inheritance in Man): #601803
- Orphanet: ORPHA683
- ICD-10: Q92.5 (Other conditions involving autosomes)
Which name is preferred by medical professionals today?
Today, Pallister-Killian syndrome is the most widely accepted clinical term used in pediatric genetics and neurology. However, clinicians often pair this with the term tetrasomy 12p in formal reports to precisely describe the chromosomal abnormality. Our DiseaseMaps.org community, which currently includes 9 individuals affected by Pallister-Killian syndrome, uses these terms interchangeably to connect families with similar diagnostic experiences.
Next steps
- Consult a clinical geneticist to confirm your diagnosis via skin biopsy (fibroblast analysis), as blood tests may miss Pallister-Killian syndrome due to tissue-specific mosaicism.
- Join the DiseaseMaps community to connect with other families navigating the complexities of tetrasomy 12p.
- Request that your medical records reflect both the clinical name and the cytogenetic findings for complete documentation.
Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Pallister-Killian syndrome.
- Orphanet: The portal for rare diseases and orphan drugs, ORPHA683.
- OMIM: Online Mendelian Inheritance in Man, entry #601803.
- The Pallister-Killian Syndrome Foundation (PKS Kids).
