“…In a recent study undertaken in our department (Bogomoletz, 1976), the presence of capillary fibrin thrombi was demonstrated in rectal biopsies from five patients with clindamycin-associated colitis, three with pseudomembranous colitis, and two with non-specific colitis (the latter form appears to be an even earlier lesion than 'type 1 lesion'). Furthermore, capillary thrombosis with vasculitis has been described in rectal biopsies of other cases of clindamycinassociated colitis (Butsch et al, 1975).…”