Bone alterations in the development of achondroplasia
DOI:
https://doi.org/10.53843/bms.v5i8.56Keywords:
Achondroplasia, Medical Imaging, Radiology, Bone Development Diseases, DwarfismAbstract
Introduction: Achondroplasia, the most common type of dwarfism, is a bone dysplasia that affects 1 in every 15000 to 40000 live births, characterized by a mutation in the fibroblast growth factor gene (FGFR3). This paper aims to highlight the bone changes present in achondroplasia and the possible radiological findings. Methods: Narrative literature review conducted from April to June 2019, selecting 41 articles from the Scielo, Virtual Health Library (VHL) and Pubmed databases. Five books were also consulted. Results: Numerous bone changes were found in achondroplastic individuals. The following were observed in the skull: decreased diameter of the foramen magnum, disproportion between viscerocranium and neurocranium, crowded dentition, mandibular prognathism, depressed nasal bridge, prominent frontal bone and central hypoplasia of the face. In the spine, the vertebral pedicles are shorter, vertebral canal stenosis, lumbar kyphosis, hyperlordosis, and scoliosis occur. The pelvis presents small and depressed ischial spines, rounded iliac ends, a square-shaped iliac fossa, and a horizontal acetabular roof. The sacrum is narrow and horizontal. In the limbs, rhizomelic shortening and bony prominences stand out. Fibular overgrowth occurs, with anterior tibial angulation, inability to everse the foot, and genu varum. In the upper limb, the radial head is flattened, limiting movement of the elbow. The hands are trident shaped, with short proximal phalanges and metacarpal deformities. The rib cage is small but broad, with short ribs and broadened anterior extremities. Discussion: The modifications mentioned corroborate the clinical and radiological findings in the diagnosis by ultrasonography from the twentieth gestational week and by radiography after birth. Conclusion: Of the changes described, those of the skull, spine, pelvis, limbs and chest stand out. There is still a need for more complete studies on the subject.
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