Different regulation type of activation of MMPs has been found in these two diseases. If MMP-2 expression is intense in the mucosa, then this ends with polyp formation; if MMP-7 expression is intense, it ends with CRS or stays as CRS.

Identical results in objective and subjective parameters were observed for both techniques.

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Formation of experimental myringosclerosis was reduced or inhibited and tympanic membranes were thinner after systemic Ginkgo biloba extract administration.

Extraskeletal myxoid chondrosarcoma presenting in the head and neck is extremely rare. Histologic diagnosis is difficult and close co-operation among clinician, radiologist and pathologist is recommended. The tumour has a better prognosis than myxoid chondrosarcoma of the bone but surgical resection may be difficult due to its gelatinous nature. We present a case of extraskeletal myxoid chondrosarcoma originating in the left nasal cavity of a 35-year-old woman.