The Collaborative International Dictionary of English v.0.48:

Pleuralgia \Pleu*ral"gi*a\, n. [NL., fr. Gr. ? rib + ? pain.]
   (Med.)
   Pain in the side or region of the ribs.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pleuralgia
    n 1: pain in the chest caused by inflammation of the muscles
         between the ribs [syn: pleurodynia, pleuralgia,
         costalgia]