SU26.{1,3-4} | Cardiothoracic Surgery — Assignment

CLINICAL SCENARIO

A 64-year-old man, a lifelong heavy smoker, attends the surgical outpatient clinic. Over three months he has developed a changed, persistent cough, two episodes of haemoptysis, and 6 kg of unintentional weight loss. On examination he has a left-sided Horner's syndrome (ptosis, miosis, anhidrosis) and dull percussion at the left apex. A chest X-ray shows a left apical opacity, and a contrast CT confirms a superior sulcus (apical) mass with no obvious distant metastasis. While reviewing his old notes you also see he had, two years earlier, a mechanical aortic valve replacement and is on warfarin, and that his brother is being investigated for an anterior mediastinal mass associated with myasthenia gravis. Using compartment-and-syndrome reasoning and the histology-plus-stage framework, work through this family's thoracic surgical problems.

1. The apical lung tumour and Horner's syndrome (SU26.4)

Explain why this patient's apical (Pancoast) tumour has produced Horner's syndrome, and describe the four ways lung cancer characteristically presents. Outline the staging work-up (confirm tumour → histology → stage) and why both histology and stage must be known before any operation.

Guidance: Link the sympathetic chain invasion to ptosis/miosis/anhidrosis; mention local, metastatic, paraneoplastic and systemic presentations.

2. SCLC versus NSCLC and the management branch point (SU26.4)

Contrast small-cell and non-small-cell lung cancer in terms of typical location, paraneoplastic syndromes, and principal treatment modality. State, with reasoning, what the management would be if this man's biopsy showed SCLC versus resectable NSCLC.

Guidance: Central + paraneoplastic (SIADH, ectopic ACTH) + chemotherapy for SCLC; surgery for resectable NSCLC in a fit patient.

3. The mechanical valve and anticoagulation around surgery (SU26.1)

Explain why this patient's mechanical aortic valve mandates lifelong warfarin, how this differs from a bioprosthetic valve, and what general principle governs his anticoagulation if he needs a thoracic operation.

Guidance: Mechanical = durable but thrombogenic, lifelong warfarin; bioprosthetic = no lifelong anticoagulation but limited durability; peri-operative bridging principle.

4. The brother's anterior mediastinal mass (SU26.3)

Using compartment-predicts-pathology reasoning, explain the differential for an anterior mediastinal mass (the 'four T's') and why thymoma is the most likely diagnosis given the myasthenia gravis. State the principle of management and why not every mediastinal mass is rushed to theatre.

Guidance: Anterior four T's (thymoma, teratoma, thyroid, lymphoma); thymoma–myasthenia link; compartment-based reasoning may indicate non-surgical treatment (e.g. lymphoma).

5. Synthesis

Bring the threads together: how does the principle of 'establish the diagnosis (compartment/syndrome for the mediastinum; histology and stage for the lung) before deciding on surgery' apply across all three problems in this family?

Guidance: Emphasise that surgery is offered only when a correctable mechanical/anatomical problem exists and the patient will benefit; diagnosis precedes the knife.