Words to Describe pseudomembranes

How pseudomembranes often is described ("________ pseudomembranes")

• classic
• conjunctival
• whitish
• white
• inflammatory
• called
• diphtheritic
• fibrinous
• characteristic
• grayish
• young
• necrotic
• yellow
• transient
• gray
• adherent
• thick
• rectal
• coherent
• dirty
• confluent
• typical
• colonic
• extensive