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 to 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 sublingual mass that had recently grown. Histopathologic study showed a ruptured dermoid cyst with mural foci of granulomatous foreign body reaction mixed with numerous ringlike structures, LRs.

CONCLUSION

To the best of our knowledge, this is the first reported case of LRs in a dermoid cyst. Pathologists should be aware of this association when diagnosing cystic lesions.