They are thought to the carry the same pathophysiological mechanism as metachronous lung carcinoma (i.e. two or more primary lung cancers occurring in different portions of the lung spaced in time). Both synchronous and metachronous lung cancers are sometimes cumulatively described under the umbrella term "multiple primary lung cancer (MPLC)" 1.
They are rare with the reported incidence of synchronous multiple primary lung cancer being reported ranging from 0.26 to 1.33% 5-6.
Synchronous lung carcinomas can be represented by various histological types although statistically they are more commonly represented by squamous cell carcinoma of the lung 5.
Treatment and prognosis
Prognosis can widely vary dependent on the stage, grade and subtype of each tumour. In resectable cases, pneumonectomy is the generally considered operation of choice for synchronous unilateral tumours. When bilateral, sequential resection starting with the most advanced lesion has sometimes being proposed 2. As a crude general rule, synchronous cancers are thought to carry a more favorable prognosis compared with metastatic nodules 7.
In imaging consider
- intrapulmonary metastases from primary lung cancer, i.e. one of the lesions can be a primary while the other metastases
- two or more intrapulmonary from cancer from outside the lung, i.e. both or all lesions are metastases
lung cancer: overview
non small-cell lung cancer
- adenosquamous carcinoma
- large cell carcinoma
- primary sarcomatoid carcinoma of lung
- squamous cell carcinoma
- salivary gland type tumours
- pulmonary neuroendocrine tumours
- preinvasive lesions
- benign neoplasms
- pulmonary metastases
- lung cancer screening
- lung cancer staging
- non small-cell lung cancer
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