Unilateral axillary lymphadenopathy (differential)
Unilateral axillary lymphadenopathy while being more concerning than bilateral axillary lymphadenopathy can still arise from a variety of benign, as well as malignant, causes.
Benign
- mastitis
- other regional infective causes
- tuberculosis
- ipsilateral arm infection, e.g. cellulitis
- silicone induced granulomatous adenitis
Malignant
- metastasis from breast malignancy
- metastasis from non-breast malignancies
- melanoma: a relatively common non-breast primary malignancy to present with axillary lymphadenopathy
- primary malignancy in ipsilateral arm
- lymphoma: can occasionally be unilateral
See also
