Clinical Report: CT Imaging Characteristics of Undifferentiated Carcinoma Lacking SMARCA4

Overview

This study characterizes the CT imaging features of pulmonary SMARCA4-deficient undifferentiated carcinoma, highlighting aggressive imaging profiles that may assist in diagnosis. Key findings include common features such as spiculated margins, intratumoral necrosis, and multi-structure invasion.

Background

Pulmonary SMARCA4-deficient undifferentiated carcinoma is a rare and aggressive malignancy with poor prognosis and nonspecific imaging characteristics. Understanding its CT imaging features is crucial for early diagnosis and differentiation from other thoracic malignancies. This knowledge can facilitate timely immunohistochemical confirmation and appropriate management.

Data Highlights

Key Findings

• Median maximum tumor diameter was 3.7 cm (range, 0.6–9.5 cm).
• Nearly half of the tumors were centrally located.
• Contrast-enhanced CT showed heterogeneous moderate-to-marked enhancement.
• Conglomerated lymphadenopathy was observed in 73.3% of cases.
• All cases demonstrated loss of SMARCA4 (BRG1) nuclear expression.

Clinical Implications

The aggressive imaging profile of SMARCA4-deficient undifferentiated carcinoma may aid radiologists in raising suspicion for this malignancy. Recognizing these imaging features can prompt earlier immunohistochemical testing and appropriate treatment strategies.

Conclusion

The study provides a comprehensive overview of the CT imaging characteristics of pulmonary SMARCA4-deficient undifferentiated carcinoma, emphasizing the need for awareness of these features in clinical practice. Further research is warranted to validate these findings across larger cohorts.

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9. Detection of targetable genetic alterations in SMARCA4-deficient neoplasms of the lung – further evidence of a relationship between SMARCA4-deficient undifferentiated tumor and non-small cell carcinoma - ScienceDirect