"I'm facing a deadline, in this case, a pressing one," wrote Rosenthal, who was diagnosed with ovarian cancer in 2015. "I need to say this (and say it right) while I have a) your attention, and b) a pulse."
Rosenthal, 51, then described her husband of 26 years, Jason, in a mock dating profile.
"I have never been on Tinder, Bumble or eHarmony, but I'm going to create a general profile for Jason right here, based on my experience of coexisting in the same house with him for, like, 9,490 days," she wrote.
In the emotional essay, Rosenthal describes her husband, a lawyer, as a "sharp dresser," an "absolutely wonderful father," and a "dreamy, let's-go-for-it travel companion."
"Jason is compassionate – and he can flip a pancake," she wrote.
Rosenthal added: "Here is the kind of man Jason is: He showed up at our first pregnancy ultrasound with flowers. This is a man who, because he is always up early, surprises me every Sunday morning by making some kind of oddball smiley face out of items near the coffeepot: a spoon, a mug, a banana.