Pachyonychia Congenita synonyms

Pachyonychia Congenita (PC) is a rare genetic disorder characterized primarily by hypertrophic nail dystrophy and painful palmoplantar keratoderma. While it is officially classified as Pachyonychia Congenita in modern medical literature, it has historically been referred to by several eponyms and descriptive terms, including Jadassohn-Lewandowsky syndrome, based on the physicians who first described the clinical presentation in 1906.

What are the historical and alternative names for Pachyonychia Congenita?

In older medical texts and legacy patient records, you may encounter several synonyms for Pachyonychia Congenita. These names often reflect the era of discovery or specific phenotypic variations. Common terms include:

• Jadassohn-Lewandowsky syndrome: Named after the two dermatologists who first defined the condition.


• Pachyonychia congenita syndrome: A term sometimes used to emphasize the multisystem nature of the disorder.


• Type I Pachyonychia Congenita (Jadassohn-Lewandowsky type)


• Type II Pachyonychia Congenita (Jackson-Lawler type)

Why does Pachyonychia Congenita have multiple names?

The variety of names stems from early medical efforts to categorize the condition before its genetic basis was understood. Historically, Pachyonychia Congenita was split into two main types based on clinical features: PC-1 (associated with oral leukokeratosis) and PC-2 (associated with steatocystoma multiplex and natal teeth). Modern nomenclature now favors classification based on the specific keratin gene mutation (e.g., KRT6A, KRT6B, KRT6C, KRT16, or KRT17) rather than older eponyms.

How is the condition classified in medical databases?

Standardized medical systems have unified the terminology to ensure consistency in research and clinical care:

1. OMIM (Online Mendelian Inheritance in Man): Lists the disorder under entry #167200 (PC-1) and #167210 (PC-2).


2. Orphanet: Uses the preferred term Pachyonychia Congenita (ORPHA:670).


3. ICD-10/11: Categorized under rare congenital skin disorders, often mapped to specific keratinization codes.

Which name is preferred by medical professionals?

Today, medical professionals and international experts prefer the term Pachyonychia Congenita. This name is accurate, descriptive of the primary nail pathology, and aligns with the current genetic understanding of the disorder. Using this standardized term helps patients connect with the 4 community members currently sharing experiences on DiseaseMaps.org and ensures access to the most recent clinical literature.

Next steps

• Consult a board-certified dermatologist or a clinical geneticist to confirm your diagnosis through genetic testing.


• Connect with the Pachyonychia Congenita Project (PC Project) for patient advocacy and specialized clinical information.


• Join the DiseaseMaps.org community to share experiences with others navigating life with Pachyonychia Congenita.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• Orphanet: Pachyonychia Congenita (ORPHA:670)


• NIH Genetic and Rare Diseases Information Center (GARD)


• OMIM: Pachyonychia Congenita (167200)


• Pachyonychia Congenita Project (pachyonychia.org)