[The Crab Sonnets] 
 
Out, damned spot! -Lady Macbeth  
 
Back and forth, within a sheath, I glide 
into the humming womb of a machine 
that magnifies my lungs upon a screen 
to fix the darkening spot that daily vied 
to make me cough, and last time flatly lied 
about the flecks of blood that streaked the green 
forewarning sputum. The taste is obscene. 
Deep breath. Hold it. Breathe. The dials inside 
This deus ex machina fix my life. 
The giant squints, and readjusts its span 
to photograph the lesions and the strife— 
knots like crab-crass that can buckle a man— 
and show the surgeon where to press the knife 
while I am deep in sleep. Or that's the plan.
William F Dougherty
http://www.poemhunter.com/poem/rev-out-damned-spot/