Potocki-Shaffer syndrome

Potocki-Shaffer syndrome is a disorder that affects the development of the bones, brain, and other tissues. The signs and symptoms of Potocki-Shaffer syndrome vary widely among affected individuals.

People with Potocki-Shaffer syndrome have enlarged openings (foramina) in the parietal bones, which are the two bones that form the top and sides of the skull. Openings in the parietal bones are normal during fetal development, but they usually close before birth. In people with this condition, the parietal foramina are larger than normal and may remain open after birth. Affected individuals often have a wide, short skull (brachycephaly). Their head size may be normal or unusually small.

Most people with Potocki-Shaffer syndrome have multiple noncancerous (benign) bone tumors called osteochondromas. In rare instances, these tumors become cancerous.

Other features of Potocki-Shaffer syndrome include intellectual disabilities, recurrent seizures (epilepsy), and delayed development of speech and motor skills (such as sitting and walking).

Many people with Potocki-Shaffer syndrome have distinctive facial features, such as a broad and tall forehead, a prominent bridge of the nose, a narrow distance between the nose and upper lip (a short philtrum), a short nose with a wide tip, and a downturned mouth.

Less commonly, Potocki-Shaffer syndrome causes vision problems; additional skeletal abnormalities; and defects in the heart, kidneys, and urinary tract.

Other names

Chromosome 11p11.2 deletion syndrome; P11pDS; Proximal 11p deletion syndrome; PSS

Inheritance pattern

Autosomal dominant

Related genes

EXT2; ALX4; PHF21A

Source: MedlinePlus Genetics, U.S. National Library of Medicine.