I would like to know whether it is multiple myeloma
or malignant melanoma
. Both this can occur in sinus cavity. If there is any brain metastasis
due to melanoma he can have some behavioural problem depending upon the the size and location of the tumour metastasis in brain.
If it is myeloma then there is a chance of platelet abnormality which may cause bleeding after passing stools.
Whatever it is a biopsy from the lesion in the sinus cavity will rule out cancer. An oncologist
consultation is mandatory.
Dr. Mohammed Ibrahim