Condensing osteitis of the clavicle is a rare and benign idiopathic
entity that is probably degenerative or mechanical in etiology. It is
usually seen in women of late child-bearing age as a variably painful and
tender swelling over the medial end of the clavicle. Radiographs show
sclerosis and slight expansion of the medial one-third of the clavicle.
Although malignant tumor of bone must be considered in the differential
diagnosis of a disease that has such radiographic findings, numerous and
expensive screening tests for a presumed primary malignant lesion are not
recommended for most patients. It is recommended, however, that an
excisional or (preferably) incisional biopsy be performed in all patients
unless pain is insignificant and the clinical presentation strongly
supports the diagnosis of condensing osteitis. Many patients who have
slight pain do not need treatment. Anti-inflammatory medications are
variably effective. Patients in whom the lesion is refractory respond well
to excision of the medial one-third of the clavicle.