Which of the following statements is true about retrosternal goitre?

Correct Answer: A. Most of the retrosternal goiters can be removed by a neck incision

Retrosternal goitre (RSG) is a downward extension of thyroid tissue below the thoracic inlet. The key discriminator is that most RSGs (60–80%) can be successfully removed via a cervical approach alone, contrary to the common misconception that sternotomy is mandatory. The neck incision allows adequate mobilization and delivery of the lower poles through gentle traction. Only 20–40% of RSGs require sternotomy—specifically those with significant intrathoracic extension, posterior mediastinal location, or involvement of great vessels. The cervical approach is preferred as first-line because it avoids the morbidity of sternotomy (longer operative time, pain, infection risk, respiratory compromise). In Indian practice, following Bailey & Love guidelines, the surgeon attempts cervical removal first; sternotomy is reserved for cases where the lower pole cannot be delivered or where vascular compromise is anticipated. Preoperative imaging (CT chest) helps predict which cases will need sternotomy, but the majority of RSGs present with extension that is still amenable to cervical removal with careful dissection and mobilization of the inferior thyroid vessels.

Why the other options are wrong

B. Operated in all patients regardless of symptoms — This is wrong because RSG surgery is symptom-driven, not routine. Asymptomatic RSGs discovered incidentally on imaging are often managed conservatively with surveillance imaging every 1–2 years. Surgery is indicated only when there are compressive symptoms (dysphagia, dyspnea, stridor, superior vena cava syndrome) or when malignancy is suspected. Many patients live for years with asymptomatic RSG without intervention, making routine surgery unnecessary and exposing patients to avoidable operative risk. C. It receives blood supply from the thoracodorsal artery — This is wrong because the thoracodorsal artery is a branch of the subscapular artery supplying the latissimus dorsi muscle—it has no anatomical relationship to thyroid blood supply. RSG is supplied by the inferior thyroid arteries (primary), superior thyroid arteries, and occasionally by ectopic branches from the aorta or brachiocephalic vessels if there is significant intrathoracic extension. This is a classic NBE trap using an anatomically irrelevant vessel to distract from thyroid vascular anatomy. D. Sternal incision is always required to operate — This is wrong because sternotomy is not always required—it is reserved for select cases (20–40%) with extensive intrathoracic extension, posterior mediastinal location, or vascular encasement. The majority of RSGs are managed via cervical approach alone. Routine sternotomy would unnecessarily increase morbidity and operative time. Indian surgical practice (Bailey & Love, AIIMS protocols) advocates cervical approach first, with sternotomy as a secondary option only when cervical mobilization fails or vascular injury is imminent.

High-Yield Facts

Mnemonics

RSG Surgery Decision (CERVICAL FIRST) Cervical approach first (80% success) → Extension assessed on CT → Reserve sternotomy for Vascular encasement/posterior mediastinal location → Incision choice depends on Complexity → Avoid routine sternotomy → Large intrathoracic extension may need sternotomy. When to do Sternotomy in RSG PAVE: Posterior mediastinal location, Aortic/great vessel involvement, Vascular encasement, Extensive intrathoracic extension (>50% in chest).

NBE Trap

NBE pairs "retrosternal goitre" with "always requires sternotomy" to trap students who confuse the minority of complex cases (requiring sternotomy) with the majority of straightforward RSGs (amenable to cervical removal). The thoracodorsal artery distractor is a classic anatomical red herring unrelated to thyroid blood supply.

Clinical Pearl

In Indian practice, a 55-year-old woman with RSG and dysphagia is first evaluated with CT chest to assess intrathoracic extension. If <50% of the goitre is below the thoracic inlet and there is no vascular encasement, the surgeon confidently proceeds with cervical approach, avoiding unnecessary sternotomy and its associated morbidity. Intraoperative conversion to sternotomy is rare if preoperative imaging is adequate.

_Reference: Bailey & Love Ch. 40 (Thyroid); Harrison Ch. 397 (Thyroid Disorders)_