Ehlers-Danlos syndrome comprises a heterogeneous group of collagen disorders (hereditary connective tissue disease).
There is a recognized male predominance.
Ehlers-Danlos syndrome clinically manifests with
- skin hyperelasticity and fragility
- joint hypermobility
- blood vessel fragility with bleeding diathesis 1
- poor tissue healing with delayed healing with tissue paper-like scarring 1
There are at least ten subtypes with variable inheritance patterns. The majority are autosomal dominant:
- types I, II and III are autosomal dominant with an unknown biochemical origin.
- type IV (also called vascular Ehlers-Danlos syndrome 4) is autosomal dominant and involves the arteries, GI tract, uterus and skin; COL3A1 mutation result in type III collagen production
- type VI is recessively inherited. It results from a mutation in the gene that encodes lysyl hydroxylase
- type VII is autosomal dominant. It results from COL1A1 and COL1A2 mutation that results in defective conversion of procollagen to collagen
- types V, VIII, IX and X are very rare and their features have not been fully described 1
The imaging findings of Ehlers-Danlos syndrome are best discussed according to system.
- multiple ovoid calcifications (<1 cm) in the subcutaneous tissue
- ectopic ossification 2
- hemarthrosis (especially knees)
- recurrent dislocation: including spontaneous dislocation of the temporomandibular joint 3
- precocious osteoarthritis
- fragile blood vessels
- arterial aneurysm formation
- increased occurrence of arterial dissection: aortography contraindicated 2
- ectasiae of the gastrointestinal tract
- 1. Kumar P, Clark ML. Kumar & Clark's clinical medicine. Saunders Ltd. (2009) ISBN:0702029939. Read it at Google Books - Find it at Amazon
- 2. Dähnert W. Radiology review manual. Lippincott Williams & Wilkins. (2007) ISBN:0781738954. Read it at Google Books - Find it at Amazon
- 3. Dixon AK, Adams A. Diagnostic Radiology. Churchill Livingstone. (2007) ISBN:0443101639. Read it at Google Books - Find it at Amazon
- 4. Zilocchi M, Macedo TA, Oderich GS et-al. Vascular Ehlers-Danlos syndrome: imaging findings. AJR Am J Roentgenol. 2007;189 (3): 712-9. doi:10.2214/AJR.07.2370 - Pubmed citation
- 5. Ayres JG, Pope FM, Reidy JF et-al. Abnormalities of the lungs and thoracic cage in the Ehlers-Danlos syndrome. Thorax. 1985;40 (4): 300-5. doi:10.1136/thx.40.4.300 - Free text at pubmed - Pubmed citation
- 6. Jose Gutierrez, Ralph L. Sacco, Clinton B. Wright. Dolichoectasia—an evolving arterial disease. (2011) Nature Reviews Neurology. 7 (1): 41. doi:10.1038/nrneurol.2010.181 - Pubmed