Modifiers matching vein:

• large,
• varicose,
• peripheral,
• small,
• sized,
• thoracic,
• cerebral,
• single,
• internal,
• systemic,
• larger,
• visible,
• central,
• major,
• smaller,
• deep,
• asymptomatic,

Simple categories matching thoracic:

• vein,
• cavity,
• organs,
• surgery,
• vessel,
• procedure,
• abnormality,
• problem,
• viscera,
• region,
• structure,