OBJECTIVE: To determine the role of fine needle aspiration cytology in
the diagnosis of extramedullary plasmacytoma. STUDY DESIGN: The study
group consisted of 13 patients with palpable masses at various sites.
The tumors were aspirated for cytologic study. RESULTS: The smears re
vealed groups of mature and immature plasma cells at various stages of
maturation. Mature plasma cells showed an eccentric nucleus and abund
ant, deep, basophilic cytoplasm with a paranuclear halo. Plasmablasts
(immature plasma cells) showed a prominent, eccentric nucleus with sin
gle, large nucleolus and abundant, deep, basophilic cytoplasm with no
paranuclear halo. Binucleate and multinucleate forms were also seen qu
ite often. The tumors were excised, and the histologic sections confir
med the cytologic diagnosis. All the patients received radiotherapy. O
ne patient (18 years old) developed recurrence and died due to extensi
ve infiltration into the maxilla and mandible. Two patients (57 and 62
years) developed multiple myeloma one to two years after the excision
of tumors, and both died two to three months later. The remaining 10
patients were alive and well at this writing. CONCLUSION: The smears f
rom all 13 patients were diagnosed as extramedullary plasmacytomas by
fine needle aspiration cytology.