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Fig. 2C —Cadaver of 80-year-old man with communicating foramen. Sequential axial T1-weighted fat-suppressed MR images show contrast material surrounding intersecting extensor pollicis longus (arrowhead), extensor carpi radialis brevis (short arrow, A), and extensor carpi radialis longus (long arrow, A) tendons and outline of small shelf (dashed arrow, B and C), which is part of foramen, in medial aspect of sheath separating crossing tendons.