Bronchial Paraganglioma with SDHB Deficiency

Area of Science:

• Oncology
• Genetics
• Pathology

Background:

• Paragangliomas are tumors of neuroendocrine origin, with approximately 30% linked to hereditary mutations, particularly involving succinate dehydrogenase (SDH) genes.
• While most paragangliomas are sporadic, hereditary forms are more common in young patients or those with multiple neoplasms.

Observation:

• A 22-year-old woman presented with a left main bronchus tumor and a history of gastrointestinal stromal tumor (GIST) without KIT or PDGFRA mutations.
• Histological examination revealed a nested proliferation of medium-sized cells expressing neuroendocrine markers (chromogranin A, synaptophysin).
• Neoplastic cells showed a lack of SDHB gene product expression.

Findings:

• The diagnosis of bronchial paraganglioma was established.
• The patient was diagnosed with Carney-Stratakis syndrome, a rare hereditary condition associated with paragangliomas and GISTs.
• Bronchial paragangliomas are rare, present diversely, and typically follow a benign clinical course.

Implications:

• This case underscores the significance of genetic screening in identifying hereditary syndromes associated with paragangliomas, especially in young individuals.
• Recognizing the link between bronchial paragangliomas and hereditary conditions like Carney-Stratakis syndrome is crucial for accurate diagnosis and management.
• Further research into the genetic basis and clinical presentation of rare tumors like bronchial paragangliomas is warranted.