Introduction:

carcinoma (NPC) is low, but it varies significantly among ethnic groups and geographical regions.1.2 NPC has an early tendency to locally spread and nodal involvement is highly frequent and bulky regardless of the size of the primary. 3.4
NPC can be difficult to diagnose. not only because is the post nasal space (PNS) is inaccessible to examination, but also it is frequently occupied by
normal lympho-epithelium which can make differentiation from NPC difficult. Together with its frequent atypical presentation, it is not surprising that the diagnosis is missed or delayed.5.6.7
Endemic NPC is biologically different from squamous cell carcinoma of the head and neck. Systemic relapse,

especially in those who present with locally advanced disease, is more commonly seen and tends to be more aggressive.8.9 Most NPC in endemic areas are of the World Health Organizination (WHO)type II (non keratinizing carcinoma)
and type III undifferentiated carcinoma. (WHO type III).10
NPC has-unique features among head and neck malignancies that increase the significance of quality of life.11 NPC affects a younger group of patients than do other carcinomas of the head and neck, and usually is not associated with smoking or alcohol abuse.11-15
The purpose of this study is to investigate the correlation between cervical lymph nodes involvement and histological types of nasopharyngeal carcinoma.