Breast Screening & Diagnostic Practice Test 2026 – Comprehensive All-in-One Guide for Exam Success!

Compressing a hard malignant breast lesion typically does not alter its shape because these masses are dense and infiltrative, with fibrous stroma that makes them resistant to deformation. Their tissue is often adherent to surrounding structures, so gentle pressure doesn’t flatten or reshape the lump. This non-compressibility is a hallmark that helps distinguish many malignant lesions from benign ones, which are more likely to change shape or be displaced when pressed. External pressure isn’t expected to cause necrosis or shrinkage of a malignant tumor, since those effects arise from internal tumor biology rather than the mechanical force of palpation. Therefore, the statement that it will not change shape best reflects how a hard malignant lesion behaves under compression.