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Synonyms: Tobias syndrome, Ciuffini-Pancoast-Tobias syndrome
Pancoast's syndrome is usually caused by an apical (superior pulmonary sulcus) malignant neoplasm of the lung. They are rare, accounting for fewer than 5% of all lung cancers. The neoplasm is usually bronchogenic in origin (about half are squamous cell carcinomas, half adenocarcinomas).
This syndrome results from the invasion of a number of structures and tissues around the thoracic inlet and may be characterised by:
- Ipsilateral invasion of the cervical sympathetic plexus, leading to Horner's syndrome (miosis, enophthalmos, ptosis) in 14-50% of patients.
- Ipsilateral reflex sympathetic dystrophy in the arm, with enhanced sensitivity to touch, and skin changes.
- Shoulder and arm pain (from the brachial plexus invasion C8-T1) with wasting of the intrinsic hand muscles and paraesthesiae in the medial side of the arm.
- Less commonly, unilateral recurrent laryngeal nerve palsy producing unilateral vocal cord paralysis (hoarse voice ± bovine cough), and/or phrenic nerve involvement.
- Arm oedema secondary to the compression of blood vessels.
- Superior vena cava obstruction, with facial swelling, difficulty breathing and a flushed appearance.
The main presenting features of shoulder and arm pain, in the absence of respiratory symptoms, can result in a delay in diagnosis while the patient is inappropriately investigated for cervical arthritis, shoulder bursitis and rotator cuff injuries.
Left apical tumour. By Dr Ian Bickle (own work), via Radiopaedia.org
Malignancies other than lung cancer can result in Pancoast's syndrome. Primary cancers have been reported, such as breast, mesothelioma, plasmacytoma or lymphoma; or metastatic carcinoma from the larynx, cervix, bladder, thyroid or colon.
Non-neoplastic causes of Pancoast's syndrome are rare; however, there have been reported cases due to bacterial pneumonia (staphylococcal or pseudomonas), tuberculosis, hydatid disease[6, 7], mycotic aneurysm, disseminated nocardiosis (a rare Gram-positive bacterial infection), plasma-cell granulomas, a cervical rib and pulmonary amyloidosis.
This is as for other bronchogenic carcinomas, ie the tumour, node and metastasis (TNM) classification. Most Pancoast tumours are T3 at presentation, as there is invasion of pleura and the brachial plexus.
This is similar to other lung cancers with an emphasis on imaging, including CXR and CT scan of the lungs and abdomen, and also possibly positron emission tomography (PET). MRI is the imaging of choice to assess structures at the thoracic inlet prior to surgery[2, 9]. Brain CT or MRI are usually performed, as it is the most common site of metastases. Good biopsy results are usually achieved by percutaneous methods.
There are a number of surgical approaches, each with their advantages and disadvantages. The three most common procedures are the high postero-lateral approach, the anterior transcervical thoracic approach and the anterior trans-sternal approach.
Resection may involve a wedge resection or a lobectomy[2, 10, 12]. Historically the involved brachial plexus has also been resected, leading to paralysis and neuropathic pain; however, this has largely been shown to be unnecessary.
Until the 1990s bimodal treatment (pre-operative radiotherapy followed by surgery) resulted in a five-year survival at best of only 30%, and a recurrence rate of 70%. However, the advent of trimodal therapy (induction chemoradiotherapy followed by resection) has decreased recurrence rates to 30%; five-year survival remains modest at between 40% and 70%[2, 11].
Further reading and references
; NICE Clinical Guideline (April 2011)
; Pancoast tumors: characteristics and preoperative assessment. J Thorac Dis. 2014 Mar6 Suppl 1:S108-15. doi: 10.3978/j.issn.2072-1439.2013.12.29.
; Superior sulcus (Pancoast) tumors: current evidence on diagnosis and radical treatment. J Thorac Dis. 2013 Sep5(Suppl 4):S342-S358.
; Case report of Pancoast tumour mimicking temporal arteritis BMJ Case Reports 2012
; Pancoast syndrome: A rare presentation of non-Hodgkin's lymphoma. Lung India. 2013 Jul30(3):209-11. doi: 10.4103/0970-2113.116266.
; Metastatic colon cancer presenting as Pancoast's disease. Am J Surg. 2009 May197(5):e51-2. Epub 2009 Feb 13.
; Unusually located intrathoracic extrapulmonary mediastinal hydatid cyst manifesting as Pancoast syndrome. J Thorac Cardiovasc Surg. 2005 Mar129(3):688-9.
; Pancaost syndrome related to hydatid cyst. Pan Afr Med J. 2013 Mar 2714:118. doi: 10.11604/pamj.2013.14.118.1754. Print 2013.
; Superior pulmonary sulcus tumors and Pancoast's syndrome. N Engl J Med. 1997 Nov 6337(19):1370-6.
; Pancoast tumor: the role of magnetic resonance imaging. Case Rep Radiol. 20132013:479120. doi: 10.1155/2013/479120. Epub 2013 Mar 31.
; Management of Pancoast tumours. Lancet Oncol. 2006 Dec7(12):997-1005.
; Superior sulcus tumors (Pancoast tumors). Ann Transl Med. 2016 Jun4(12):239. doi: 10.21037/atm.2016.06.16.
; Management of tumors involving the chest wall including pancoast tumors and tumors invading the spine. Thorac Surg Clin. 2013 Aug23(3):313-25. doi: 10.1016/j.thorsurg.2013.05.001. Epub 2013 Jul 16.
; Pancoast tumors. Neurosurg Clin N Am. 2008 Oct19(4):545-57, v-vi.
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