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Carcinoma showing thymiclike differentiation (CASTLE tumor)
A T Ahuja1, E S Chan, P W Allen
1Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, the Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT.
AJNR. American Journal of Neuroradiology
|September 3, 1998
Summary
A rare neck and thyroid carcinoma with thymiclike differentiation presented as a growing mass. Imaging revealed a solid, lobulated tumor extending from the submandibular gland to the supraclavicular fossa.
Area of Science:
- Oncology
- Radiology
- Pathology
Background:
- Neck masses can present with diverse etiologies, necessitating comprehensive diagnostic evaluation.
- Carcinomas with thymiclike differentiation are exceptionally rare in the head and neck region.
Observation:
- A 67-year-old woman presented with a 10-year history of a progressively enlarging neck mass.
- Imaging studies (ultrasound, CT, MRI) demonstrated a large, solid, noncalcified mass in the carotid and posterior neck spaces, extending inferiorly.
- The mass displaced adjacent structures, including the common carotid artery and sternomastoid muscle.
Findings:
- Sonographic findings included a hypoechoic, solid mass with lobulated outlines.
- CT scans revealed soft-tissue density, while MRI showed isointensity on T1-weighted and hyperintensity on T2-weighted images.
- Mild enhancement was observed after contrast administration on both CT and MR studies.
- Histopathological examination confirmed a carcinoma with thymiclike differentiation.
Implications:
- This case highlights the importance of considering rare malignancies in the differential diagnosis of persistent neck masses.
- Accurate imaging characterization is crucial for surgical planning and diagnosis of unusual tumors.
- Recognition of thymiclike differentiation in neck tumors expands the understanding of head and neck oncology.