Dacryoliths are often found as an underlying factor causing obstruction in chronic dacryocystitis and may be seen on CT imaging. Actinomyces may cause secondary conjunctivitis.
CT Demonstration of Dacryolithiasis Complicated by Dacryocystitis Asheim J, Spickler E. American Journal of Neuroradiology 2005;26:2640-1
Actinomyces canaliculitis; diagnosis of a masquerading disease. Briscoe D, Edelstein E,Zacharopoulus I, Keness Y, Kilman A, Zur F, Assia El. Graefes Arch Clin Exp Ophthalmol 2004;242 (8):682-6
Lacrimal excretory system concretions: canalicular and lacrimal sac Repp DJ, Lucarelli MJ. Ophthalmology 2009;116 (11) :2230-5