Liesegang rings in a dermoid cyst of the floor of the mouth - Report of a case with cytologic findings

BACKGROUND: Eosinophilic, ring-shaped structures, referred to as Liesegang rings (LRs), have been identified in aspirates from many organs, usually in relation to cystic or inflammatory lesions, but never before in relation t o a dermoid cyst. CASE: LRs were intermingled with squamous cells in aspirates from a cyst of the floor of the mouth. The patient, a 23-year-old man, presented with a s ublingual mass that had recently grown. Histopathologic study showed a rupt ured dermoid cyst with mural foci of granulomatous foreign body reaction mi xed with numerous ringlike structures, LRs. CONCLUSION: To the best of our knowledge, this is the first reported case o f LRs in a dermoid cyst. Pathologists should be aware of this association w hen diagnosing cystic lesions.