Incisional Biopsy — Removing a Sample of a Tumour

An incisional biopsy is performed when a tumour is too large, deeply situated, or anatomically delicate to be excised completely without extensive surgery. Unlike an excisional biopsy, which aims to remove an entire abnormal area along with clear margins, the goal of an incisional biopsy is strictly diagnostic. The procedure allows the surgical team to obtain adequate tissue architecture while preserving neighbouring structures.

The surgeon makes an incision through overlying skin or mucosa, visualises the mass, and carefully cuts out a wedge or core of abnormal tissue. Special care is taken to avoid disrupting normal tissue planes or contaminating potential future surgical margins. The tissue is subsequently fixed, sectioned, and examined by a pathologist.

This procedure prevents premature, disfiguring, or overly extensive operations before doctors know what they are dealing with. For large soft-tissue masses, bone tumours, or head and neck growths, knowing the exact tumour type and grade dictates whether surgery is appropriate at all, or whether chemotherapy or radiotherapy should be given first to shrink the tumour. A well-planned incisional biopsy provides the diagnostic clarity needed to make these critical treatment decisions while safeguarding the success of potential future surgeries.

The procedure yields substantial tissue, allowing pathologists to perform comprehensive assessments. These include standard haematoxylin and eosin (H&E) staining, extensive immunohistochemistry panels, cytogenetic testing, and next-generation sequencing for targetable gene mutations.

Incisional biopsies are most frequently employed in suspected soft tissue and bone sarcomas, where removing the entire mass at initial diagnosis could compromise limb-salvage surgery. They are also common in large breast masses, head and neck tumours, oral cancers, and large skin lesions where full removal would cause significant cosmetic or functional defects.

The biopsy result determines the definitive treatment pathway. If malignancy is confirmed, the biopsy scar is typically excised during subsequent definitive surgery to prevent local recurrence. Results guide whether upfront surgery, neoadjuvant chemotherapy, or radiotherapy is the optimal sequence of treatment.