Pseudolymphoma

• Benign lymphoid hyperplasia mimicking oligometastasis from non-small cell lung cancer after stereotactic ablative radiotherapy
• Intraventricular pseudolymphoma a case review
• Intracranial pseudolymphoma presenting with grand mal seizures
• CyberKnife radiosurgery for the treatment of intraocular and periocular lymphoma
• Benign orbital pseudolymphoma. Case report
• Reactive lymphoid follicular hyperplasia mimicking a peripheral nerve tumor
• Suprasellar lymphoid hyperplasia presenting with diabetes insipidus and hypogonadism
• Lymphocytic hypophysitis

An 87-year-old man with a history of localized non-small cell lung cancer (NSCLC) was referred for evaluation and treatment of an elastic hard tumor in the left supraclavicular fossa one year after stereotactic ablative radiotherapy (SABR). Whole-body PET scan showed high 18F-fluorodeoxyglucose uptake in the left supraclavicular fossa, and a dia-gnosis of oligometastasis was made. The tumor was homogeneously high signal on T2-weighted image with homogeneous enhancement after contrast administration. Since the palpation and MRI findings were inconsistent with those of metastatic NSCLC, a bio-psy was performed. Pathological and immunohistochemical investigation revealed the lesion to be BLH.

Conclusion: In a patient with suspected oligometastasis after SABR for NSCLC, caution should be exercised before undergoing SABR for oligometastasis because BLH may be present ¹⁾