Sometimes refers to the association of malignancy with venous thrombosis of any type.
Trousseau originally described the association of recurrent or migratory superficial thrombophlebitis with occult internal malignancy.
It is characterized by a recurrent and migratory pattern and involvement of superficial veins, frequently in unusual sites, such as the arm or chest.
Patients with Trousseau's syndrome usually have adenocarcinoma. One review of patients with Trousseau's syndrome reported 24% pancreatic cancer, 20% lung, 13% prostate, and 12% stomach — individuals with cancer are at risk for thrombotic complications due to a hypercoagulable state.

Armand Trousseau (1801-1867) was a French physician. He developed an unexplained deep vein thrombosis and was diagnosed a year later with what is variously described as gastric or pancreatic cancer.

Woodruff R. Palliative medicine evidence-based symptomatic and supportive care for patients with advanced cancer. 4th ed. Oxford University Press, 2004. p. 328.