The patient proceeded to CT guided biopsy.
HISTOPATHOLOGY
MICROSCOPIC DESCRIPTION: Sections show biopsies of loose fibromyxoid/fibrocollagenous stroma, adipose tissue and fragments of bone infiltrated by sheets of atypical plasmacytoid cells which contain mildly pleomorphic nuclei surrounded by small amount of eccentric cytoplasm. Mitotic activity is identified. The tumour cells show diffuse and strong positivity to CD138. Lambda LC is positive. Kappa LC is negative.
DIAGNOSIS: Plasmacytoma.