Manubrial pseudolesion: a secondary sign of thoracic outlet syndrome.

Marrow enhancement mimicking sclerotic osseous disease, or the so-called transient "pseudolesion," has frequently been described in vertebral bodies supplied by collateral basivertebral venous flow in the setting of central venous obstruction. Pseudolesions involving the sternum are much rarer and have only been described in the setting of malignant central venous obstruction. We report a case of an incidental manubrial pseudolesion on contrast-enhanced CT prompting further investigation for thoracic outlet syndrome.