Abstract
A 41-year-old man was referred for an ultrasound scan to investigate a soft tissue mass in his axilla, considered to be the cause of an axillary vein thrombosis. The scan showed the mass to be a cystic lesion, with a deep extension towards the humeral head. Magnetic resonance imaging showed a large paralabral cyst arising from the inferior labrum and extending into the axilla, compressing the axillary vein, and this was considered as the likely cause of the thrombosis. There was associated tearing of the inferior labrum, which was detached from the underlying glenoid. The patient is heterozygous for the factor 2 gene mutation, which predisposes him slightly to thrombosis. In this patient's case, his moderate increased risk of clotting coupled with extrinsic compression of the axillary vein was sufficient to lead to thrombosis. He subsequently underwent arthroscopic drainage of the cyst.
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