# Perineural invasion in head and neck cancer is most commonly seen in:
a) Adenocarcinoma
b) Cylindroma
c) Basal cell adenoma
d) Squamous cell carcinoma
The correct answer is B. Cylindroma.
Adenoid cystic carcinoma (Cylindroma):
The basal cells are arranged in anastomosing cords or a duct-like pattern, the central portion of may
contain a mucoid material , producing the typical cibriform or Swiss cheese or honey comb pattern. Peri neural spread of tumor cells is seen.
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