Results: Histologic examination showed a diffuse infiltrate of neoplastic cells in the submucosa, arranged in a scant vascularized stroma. The neoplastic cells were large to medium-sized with amphophilic cytoplasm, irregular nuclei and proeminent, eosinophilic nucleoli. Mitotic figures were frequent. Imunohistochemical stains were performed in order to make a differential diagnosis: the tumor cells were positive for CD38 and CD138 and they expressed cytoplasmic immunoglobulin with kappa light chain restriction. Most of the tumor cells were also CD56 and EMA positive. Conclusion: Even though extramedullary plasmacytoma of the sinonasal tract is rare, it should be included in the differential diagnosis. The cooperation among the otorhinolaryngolists, pathologists and hematologists are required to manage the patients effectively in order to provide optimal treatment. Objective: Sinonasal malign melanoma is a rare antity, mostly arising from nasal cavity and accounting for <5 % of all sinonasal tract neoplasms. Method: We report two patients complaining of nasal obstruction and epistaxis. Endoscopy revealed partially haemorrhagic mass obliterating nasal passage. In one patient diagnosis was done as a plasmacytoma by pathologist in an another hospital. Multiple biopsies were taken. Microscopically, the tumour was consisted of medium sized cells, which had high nuclear to cytoplasmic ratio with pleomorphic nuclei containing eosinophilic nucleoli and intranuclear cytoplasmic inclusions. The cytoplasms contained variable amount of melanin pigment. Mitosesincluding atypical forms-were easily detectable. There were mild inflammatory infiltrate against the tumour and rare tumour necrosis. One was showed pseudopapillary growth pattern and lymphovascular invasion.