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The Tram-Track Sign: Cortical Calcifications¹

¹ From the Department of Radiology, Hacettepe University, 06100 Sihhiye, Ankara, Turkey. Received May 10, 2002; revision requested July 24; final revision received December 2; accepted December 20. Address correspondence to the author (e-mail: eakp0@lycos.com).

View larger version (152K): [in a new window]   Figure 1. Posteroanterior skull radiograph in a 4-year-old girl with Sturge-Weber syndrome shows bilateral parallel cortical calcifications (arrow), illustrating the tram-track sign.

View larger version (72K): [in a new window]   Figure 2. Unenhanced transverse CT scans (left scan, window width of 79 HU and level of 50 HU; right scan, window width of 1,350 HU and level of 239 HU) of the skull show gyriform cortical calcifications in the left cerebral hemisphere and right frontal lobe. There is brain atrophy especially on the left side. The cranial vault was asymmetric secondary to brain atrophy.