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Solitary plasmacytoma (SPC) of the skull (SPS) is rare, and only a few cases have been reported in the literature so far. Plasmacytoma of the skull has a wide spectrum of pathology, including a quite benign, SPC, and an extremely malignant, multiple myeloma at the two ends of the spectrum. SPC of bone including SPS is characterized by a radiologically solitary bone lesion, neoplastic plasma cells in the biopsy specimen, fewer than 5% plasma cells in bone marrow, <2.0 g/dl monoclonal protein in the serum when present and negative urine test for Bence Jones protein (monoclonal light chain). For diagnosing, a comprehensive examination and analysis, which includes radiological examination, immunoglobulin, biochemistry, test for Bence Jones protein in the urine and bone marrow is needed.