Of 1,666 patients who underwent fine needle aspiration for breast lump
s, 4 developed pneumothorax as a complication. The incidence of this c
omplication in our patients is 1:417. The clinical manifestations were
immediate chest pain, shoulder pain and, occasionally, dyspnea that d
eveloped later. Observation is sufficient treatment in most patients,
and rarely is drainage of the pneumothorax required.