Avascular necrosis of the talus
Chronic right ankle pain
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A serpiginous line displaying low signal in T1 and high signal in T2 and STIR is seen surrounding the necrotic area of the dome and lateral portion of the talus. Associated marrow edema of the res of talus and moderate joint effusion is noted.
Diagnosis: Avascular necrosis of talus. T2 weighted images display a typical double line sign which consisting of a hypointense outer line (sclerosis and fibrosis) and a hyperintense inner line (granulation tissue). No fracture could be identified in this case.
- 1. Pearce DH, Mongiardi CN, Fornasier VL et-al. Avascular necrosis of the talus: a pictorial essay. Radiographics. 2005;25 (2): 399-410. Radiographics (full text) - doi:10.1148/rg.252045709 - Pubmed citation
- 2. Stoller D, Tirman P, Bredella M et-al. Diagnostic imaging. AMIRSYS. (2004) ISBN:0721629202. Read it at Google Books - Find it at Amazon