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Probably a sinus infection - consult a doctor or a pharmacist.
Drainage Basin: The Area of Land Drained By A River.
If by sinus cavities you mean the confluences of the sinuses, then Yes
Functional Endoscopic Sinus SurgeryFunctional Endoscopic Sinus Surgery
(liquid) nasal mucus; nasal discharge; pituita; snot;
To do with the nose.
well the definition of the word Lavage means to "wash out an organ" so lavage of the maxillary sinus mean to wash out the maxillary sinus.
nose
Clear nasal mucus or, "snot", is usually associated with allergies. If your nasal mucus is green or yellow you may have an infection and should see a doctor.
Excedrine Sinus Headache
Sinus infection.
A drainage pattern characterized by parallel main streams and secondary tributaries intersected at right angles by tributaries. Also known as espalier drainage; grapevine drainage.