Brachyolmia

Brachyolmia is a group of rare skeletal dysplasias characterized primarily by a short trunk (short-trunk dwarfism) due to platyspondyly (flattened vertebral bodies) with relatively normal limb length. The name derives from the Greek words 'brachy' (short) and 'olmos' (trunk). Several subtypes have been described, including the autosomal dominant Hobaek type (also called brachyolmia type 1), the autosomal recessive Toledo type, and the autosomal dominant type caused by mutations in the TRPV4 gene. The condition primarily affects the axial skeleton, with radiographic findings showing generalized platyspondyly, irregular vertebral endplates, and sometimes scoliosis. Affected individuals typically present in childhood with short stature that is disproportionate due to a shortened trunk, while the extremities remain relatively normal in length. Clinical features vary by subtype but commonly include mild to moderate short stature, back pain, and progressive spinal changes. In the Hobaek type, corneal opacities and precocious calcification of costal cartilages may be observed. The Toledo type may feature corneal opacities and additional biochemical abnormalities. The autosomal dominant form associated with TRPV4 mutations (sometimes called brachyolmia type 3 or Maroteaux type) presents with platyspondyly and mild limb shortening. Intelligence is typically normal in all forms. Diagnosis is based on clinical and radiographic findings, and molecular genetic testing can confirm the specific subtype. There is no specific cure for brachyolmia; management is supportive and symptomatic, focusing on orthopedic surveillance, pain management, physical therapy, and monitoring for complications such as scoliosis or degenerative joint disease. Surgical intervention may be considered for significant spinal deformity.

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