Unusual choristoma of the parotid gland in a girl - A possible trichoadenoma

An 8-year-old girl had a painless circumscribed nodule in the right parotid gland for 4 weeks. A tumour (1.3 cm diameter) within the salivary gland pa renchyma showed small cystic spaces with horn-like material macroscopically . The tumour tissue contained solid squamous cell formations and cystic spa ces limited by multilayered squamous epithelium and covered by layers of or tho- and parakeratotic cells. The cystic spaces contained keratotic lamella e. In some areas pin-like epithelial proliferations were seen, All epitheli al cells were characterized by uniform nuclei, and no atypical mitoses were seen. Keratinizated masses with partial calcification were occasionally lo cated in the interstitial tissue and replaced by multinucleated giant cells . The tumour was classified as a choristoma and resembled a trichoadenoma. The ectodermally derived oral and salivary gland epithelium may be the sour ce of skin-like or adnexal rumours.