Seaver Cassidy Syndrome

Seaver Cassidy Syndrome is a condition that - in some cases - may be considered an intersex condition, although many would say it causes intersex conditions rather than being one in of itself.

This condition can effect both CTM/AMAB and CTF/AFAB individuals, however CTM individuals are the ones who develop intersex-related traits from this condition. 80-99% CTM individuals tend to have a missing or undescended testicle and/or oddly formed scrotum.

80-99% of people with this condition have eye folds, knock knees, wide set eyes, cheekbone underdevelopment, moles, prominent and low set ears, and a wide nasal bridge. 30-79% of people with this condition have a large lower jaw, voice abnormalities, neurological speech impairment, intellectual disability, outward turned elbows, joint hyperflexibility, and umbilical hernia.

Causes
This condition is caused by developmental defect during embryogenesis, meaning that when they are forming within their parent's uterus, there are one or more biological complications that causes DNA defects within the forming embryo.

History
Seaver Cassidy Syndrome was first described in 1991 by Laurie Seaver and Suzanne Cassidy.

Resources

 * https://en.wikipedia.org/wiki/Seaver_Cassidy_syndrome
 * https://www.findzebra.com/details/jp55zLD-seaver-cassidy-syndrome?q=
 * https://www.wikidata.org/wiki/Q7442226
 * https://rareguru.com/library/disease/5206/seaver-cassidy-syndrome]
 * https://rarediseases.info.nih.gov/diseases/4778/seaver-cassidy-syndrome