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    Stage IVA maxillary sinus cancer

    Stage IV maxillary sinus cancer is divided into stages IVA, IVB, and IVC. In stage IVA, (1) cancer has spread to any of the following: the eye, the skin of the cheek, the part of the sphenoid bone behind the upper jaw, the area behind the upper jaw, the bone between the eyes, and/or the sphenoid or frontal sinuses. Cancer may have also spread to one lymph node on the same side of the neck as the cancer, and the lymph node is 3 centimeters or smaller; or (2) cancer is found in the maxillary sinus and may have spread to any of the following: the bones around the maxillary sinus (including the roof of the mouth and the nose), the bone between the eyes, the tissues under the skin, the skin of the cheek, the eye, the part of the eye socket near the nose, or the bottom of the eye socket, the area behind the cheek bone, the part of the sphenoid bone behind the upper jaw, the area behind the upper jaw, and/or the ethmoid, sphenoid, or frontal sinuses. Cancer has also spread to one of the following: one lymph node on the same side of the neck as the cancer and the lymph node is larger than 3 centimeters but not larger than 6 centimeters; or more than one lymph node on the same side of the neck as the cancer and the lymph nodes are not larger than 6 centimeters; or lymph nodes on the opposite side of the neck as the cancer or on both sides of the neck, and the lymph nodes are not larger than 6 centimeters.

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