Thymic carcinoma

Thymic carcinoma is part of the malignant end of thymic epithelial tumours.

Patients are typically 50 to 70 years of age at presentation 9.

The incidence of paraneoplastic syndromes are thought to be low. At least 10 different histologic variants have been described 4. The most common subtypes are squamous cell carcinoma and lymphoepithelial-like carcinoma 1.

Classification

Labelled as "type C" under the WHO classification scheme for thymic epithelial tumours.

CT

Useful features for differential from more benign thymic epithelial tumours include 1:

  • larger 5 and highly aggressive anterior mediastinal mass
  • areas of necrosis, haemorrhage, calcification, or cyst formation
  • gross invasion of contiguous mediastinal structures and wide spread to involve distant intrathoracic sites
  • high incidence of extrathoracic metastases
Nuclear medicine

FDG PET-CT may be useful in differentiating thymic carcinoma from other thymic neoplasms, thymic hyperplasia, and normal physiologic uptake. The standardized uptake value (SUV) for thymic carcinoma is considered to be significantly greater than that for invasive or noninvasive thymoma, often with an an SUV cutoff point of 5.0, thymic carcinoma can be differentiated from thymoma with reasonably high sensitivity (84.6%), specificity (92.3%), and accuracy (88.5%) 6

They are often associated with a poor prognosis.

For an invasive anterior mediastinal mass lesion consider:

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Article information

rID: 24552
Systems: Chest, Oncology
Section: Pathology
Synonyms or Alternate Spellings:
  • Invasive thymic carcinoma
  • Thymic carcinomas
  • Invasive thymic carcinomas

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