Presentation
Development of a palpable lesion in her left breast.
Patient Data
Age: 61 years
Gender: Female
From the case:
Malignant cyst: left breast
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Transverse

The lesion is cystic but has a thick wall. This is not a simple cyst.
From the case:
Malignant cyst: left breast

Post aspiration you can see the needle in situ with the residual post thick wall. Simple cysts disappear on aspiration.
Case Discussion
Aspiration yields adenocarcinoma cells.
No post menopausal woman should develop anything in her breast generally speaking. Any developing lesion in a post menopausal breast should be regarded with suspicion.
Simple cysts should be simple and should disappear completely on aspiration. Not all breast cancers are solid.