Platybasia

Medical condition

Platybasia
Specialty	Neurosurgical, orthopedic
Symptoms	Platybasia is characterised by abnormal flattening of the skull base as defined as a base of skull angle over 143º.In the absence of neural compression, pain at the back of the skull and upper part of the neck is the most common symptom. Neural compression may affect the medulla and nerve roots from the lower brainstem, particularly those that might affect swallowing and the cough reflex.

Platybasia is a spinal disease of a malformed relationship between the occipital bone and cervical spine.

It may be caused by Paget's disease. Platybasia is also a feature of Gorlin-Goltz syndrome, commonly known as basal cell nevus syndrome. It may be developmental in origin or due to softening of the skull base bone, allowing it to be pushed upward. The developmental variant is the result of a wider angle between the skull base of the frontal or anterior fossa and the clivus, which defines the anterior wall of the posterior fossa. It is sometimes associated with other congenital abnormalities of the bone structure, such as fusion of the first cervical vertebrae to the skull atlas assimilation.

External links

Classification	D ICD-10: Q75.8 ICD-9-CM: 756.0 MeSH: D010985

Congenital malformations and deformations of musculoskeletal system / musculoskeletal abnormality

Appendicular
limb / dysmelia

Arms

clavicle / shoulder	Cleidocranial dysostosis Sprengel's deformity Wallis–Zieff–Goldblatt syndrome
hand deformity	Madelung's deformity Clinodactyly Oligodactyly Polydactyly

Leg

hip	Hip dislocation / Hip dysplasia Upington disease Coxa valga Coxa vara
knee	Genu valgum Genu varum Genu recurvatum Discoid meniscus Congenital patellar dislocation Congenital knee dislocation
foot deformity	varus Club foot Pigeon toe valgus Flat feet Pes cavus Rocker bottom foot Hammer toe

Either / both

fingers and toes	Polydactyly / Syndactyly Webbed toes Arachnodactyly Cenani–Lenz syndactylism Ectrodactyly Brachydactyly Stub thumb
reduction deficits / limb	Acheiropodia Ectromelia Phocomelia Amelia Hemimelia
multiple joints	Arthrogryposis Larsen syndrome RAPADILINO syndrome

Axial

Skull and face

Craniosynostosis	Scaphocephaly Oxycephaly Trigonocephaly
Craniofacial dysostosis	Crouzon syndrome Hypertelorism Hallermann–Streiff syndrome Oto-palato-digital syndrome Treacher Collins syndrome
other	Macrocephaly Platybasia Craniodiaphyseal dysplasia Dolichocephaly Greig cephalopolysyndactyly syndrome Plagiocephaly Saddle nose