By the anatomical location described, it could be indeed a prominent thoracoepigastric vein, a superficial vein
that connects the veins from the upper and lower extremity of the same side; they can be seen or palpated in normal, thin people of fair skin; in patients with portal hypertension
, for example cirrhosis
, these can become prominent but are not the only enlarged veins.
Dr Brenes-Salazar MD
Mayo Clinic MN