Kaplan–Meier survival curves for CNS versus skin IVL patients. Compared to skin IVL, CNS IVL had a significantly shorter (A) median time from initial presentation of symptoms to death (18.0 [range 1.0–110.0, n = 112] versus 6.0 [range 0.1–71.1, n = 248] months, respectively [P = 0.0001]), (B) median time from diagnosis to death (23.0 [range 0.1–96.0, n = 110] versus 14.0 [range 0.1–84.0, n = 141] months, respectively [P = 0.0064]), and (C) median time from treatment to death (24.0 [range 0.7–96.0, n = 94] versus 16.0 [0.3–84.0, n = 117] months, respectively [P = 0.0238]). There was no difference between skin and CNS IVL patients with respect to (D) median time from treatment to first. recurrence (6.0 [range 1.0–33.0, n = 21] versus 8.0 [1.0–44.0, n = 16] months, respectively [P = 0.6375]). IVL, intravascular lymphomatosis; CNS, central nervous system.