Unexplained lumps and what you should do about them

Account subscription benefits alongside Premium Stories, Editorials, Opinions and more. Unlock these with Subscription

Most soft-tissue lumps are benign, so neither patients nor clinicians naturally assume that a new lump is a cancer. Yet sarcoma can present with little more than a slowly enlarging swelling. | Photo Credit: Wikipedia Commons

Many soft-tissue sarcomas, which are rare types of cancers that form in fat, muscles and blood vessels, initially look like ordinary lumps. However, when a suspicious mass of this sort is removed without appropriate imaging, tissue diagnosis or oncological planning, the opportunity for the simplest and best-planned first operation may already have been lost.

Sarcomas in India, are therefore not only a problem of late diagnosis. Some are also operated on before a diagnosis is properly established. A first operation performed without sarcoma-specific planning can make subsequent treatment more extensive, even when the disease remains potentially curable.

A retrospective analysis in AIIMS, Delhi of 157 patients with localised extremity synovial sarcoma found that more than 70% of patients reached a specialist centre only after an unplanned surgery or a recurrence.

Sarcomas are rare, accounting for about 1% of cancers in adults and roughly 15% of cancers in children. Their rarity is part of the challenge. Most soft-tissue lumps are benign, so neither patients nor clinicians naturally assume that a new lump is a cancer. Yet sarcoma can present with little more than a slowly enlarging swelling.

A soft-tissue sarcoma may appear well circumscribed, but that apparent boundary can be deceptive. Some tumours develop a surrounding pseudocapsule, and microscopic tumour cells may extend into or beyond it. If a sarcoma is removed without appropriate oncological margins, residual tumour may remain in the surgical bed. The operation that follows may then need to remove the previous scar and potentially contaminated tissues and, in some patients, may require more complex reconstruction.

The term ‘unplanned excision’ is used when a soft-tissue sarcoma is removed without appropriate preoperative imaging, histological confirmation or an oncological surgical plan. Evidence does not support the idea that such an operation automatically destroys the chance of cure. However, it can increase the risk of local recurrence and frequently creates the need for a second, wider operation to clear the tumour bed.

The AIIMS synovial sarcoma series illustrates both sides of this problem. Despite more than 70% of patients arriving after an unplanned operation or recurrence, limb salvage was still achieved in 64%. This is an important message for patients: an earlier inappropriate operation is serious, but it does not mean that amputation or treatment failure is inevitable. Prompt referral to a sarcoma team can still preserve meaningful treatment options.

Not every lump needs an MRI or a biopsy. But certain features should make a clinician stop before simply removing it.