Lateralisation of tumours of the nasal cavity and paranasal sinuses and its relationship to aetiology.

Lateralisation was studied in 601 cases of carcinoma of the nasal cavity and paranasal sinuses. Squamous and anaplastic carcinomata and adenocarcinoma had a pronounced left-sided predominance in the ethmoid and to a much lesser extent in the nose. The results of a study of 298 cases of septal defection are invoked in support of the hypothesis that squamous and anaplastic carcinomata, as well as adenocarcinoma, are caused by exogenous factors.