A possible relationship between the sinuses and the lymphoid tissue of the nasopharynx.
D005402:Fistula; D006801:Humans; D008221:Lymphoid Tissue; D009305:Nasopharynx / Q000502:physiology*; D010256:Paranasal Sinuses / Q000502:physiology*
NASOPHARYNX/physiology; PARANASAL SINUSES/physiology