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[[File:Pectoral crease.jpg|thumb|Pectoral crease in a patient with FSH muscular dystrophy]]A pectoral crease is a diagonal groove in the substance of the pectoral muscles running from the anterior axillary fold toward the neck that appears when there is shoulder girdle weakness. The usual cause is myopathy, particularly FSH.(1-3) Because of periscapular muscle weakness the scapula slides laterally, causing the arm rotate internally, so that the dorsum of the hand, rather than the thumb, faces forward. When this abnormal internal rotation of the arm and hand occur along with weakness and atrophy of the pectoral muscles the pectoral crease appears. When a patient is standing normally, the back of the hand facing forward and the presence of the pectoral crease are reliable indicators of significant shoulder girdle weakness.
==References==
1. Campbell WW. Clinical signs in neurology : a compendium. Philadelphia: Wolters Kluwer Health, 2016.
2. Campbell WW. DeJong's the neurologic examination, 7th ed. Philadelphia: Wolters KluwerHealth/Lippincott Williams & Wilkins, 2013. 3. Nelson KR, Bicknell JM. Oblique pectoral crease and "scapular hump" inshoulder contour are signs of trapezius muscle weakness. J Neurol NeurosurgPsychiatry. 1987 Aug;50(8):1082-3.
[[Category:Motor Signs]]
