Arachnodactyly--a key to diagnosing heritable disorders of connective tissue

Area of Science:

• Genetics
• Rheumatology
• Cardiology

Background:

• Arachnodactyly, or 'spidery fingers,' is a key feature of Marfan syndrome (MFS).
• However, arachnodactyly is also present in other heritable disorders of connective tissue (HDCTs), making diagnosis complex.
• The marfanoid habitus encompasses features beyond arachnodactyly, including joint hypermobility and skeletal changes.

Purpose of the Study:

• To differentiate Marfan syndrome (MFS) from other heritable connective tissue disorders (HDCTs) presenting with marfanoid habitus.
• To highlight the importance of accurate diagnosis for tailored patient management.
• To provide a diagnostic guide for clinicians encountering patients with features of the marfanoid habitus.

Main Methods:

• Review of clinical features associated with Marfan syndrome and other HDCTs.
• Comparative analysis of diagnostic criteria for differentiating MFS from related conditions.
• Focus on cardinal features of MFS: ectopia lentis and aortic root abnormalities.

Main Results:

• Arachnodactyly is not exclusive to MFS but is part of a broader marfanoid habitus seen in various HDCTs.
• Ectopia lentis and aortic root dilation/dissection are critical indicators for MFS.
• Conditions like Joint Hypermobility Syndrome and Ehlers-Danlos Syndrome, while HDCTs, typically lack these specific MFS-associated complications.

Conclusions:

• Distinguishing MFS from other HDCTs is essential for appropriate treatment strategies.
• Cardiovascular and ocular surveillance needs vary significantly among different HDCTs.
• Accurate diagnosis of HDCTs ensures optimal patient care and prognosis.