Solitary Metastasis of Adenocarcinoma of Submandibular Gland to Choroid Plexus in Cerebellopontine Angle: First Case Reported in Literature

Multifocal metastases to choroid plexus from papillary thyroid carcinoma: illustrative case

BACKGROUND

Choroid plexus metastases are extremely rare from all types of malignancy, with only 42 cases reported in the literature thus far. Most of these originate from renal cell carcinoma and present as a solitary choroid plexus lesion; only two cases of multifocal choroid plexus metastases have been reported to date.

OBSERVATIONS

The authors report the third case of multifocal metastases to the choroid plexus, that of a 75-year-old man who developed three measurable choroid plexus lesions approximately 3.5 years after undergoing total thyroidectomy and chemotherapy for papillary thyroid carcinoma. He underwent intraventricular biopsy of the largest lesion and subsequently died of hydrocephalus after opting for comfort care only.

LESSONS

This is the third case of multifocal choroid plexus metastasis in the literature and the second case of multifocal metastasis from thyroid carcinoma. As such, the natural disease course is not well characterized. This case is compared with the previous eight reports of choroid plexus metastases from thyroid carcinoma, seven of which involved solitary lesions. The eight prior cases are evaluated with attention to treatment modalities used and factors potentially influencing prognosis, specifically those that might contribute to hydrocephalus, a reported complication for this pathology.

Solitary Metastasis of Colon Adenocarcinoma Mimicking Colloid Cyst of the Third Ventricle

Metastatic lesions to the choroid plexus, although far less common than colloid cysts, can present very similarly both symptomatically and radiographically. Choroid plexus metastases are most common in the lateral ventricles, however, when they occur in the third and fourth ventricles they may cause obstructive hydrocephalus typical of a colloid cyst lesion. Renal cell carcinoma is the most common primary cancer, but many rare primaries have been reported. When patients are presenting with symptoms typical of colloid cysts it is important to consider past oncological history and if past medical history is significant for cancer using MR spectroscopy may be valuable in distinguishing between cystic and metastatic lesions.

A choroid plexus metastasis of a prostatic adenocarcinoma mimicking a choroid plexus carcinoma: A case report

A multicystic intraventricular tumour of the right ventricular atrium was incidentally diagnosed on follow-up imaging of a 61-year-old man with a history of prostatic adenocarcinoma. Surgical resection of the lesion was performed after a one-year radio-clinical follow-up due to progressive expansion of the lesion size and a rising prostate specific antigen blood-level. Morphological features with papillary pattern on pathological examination were compatible with malignant adenocarcinoma or choroid plexus carcinoma. The immunoprofile was conclusive for an exceptional choroid plexus metastasis (CPM) of a prostatic adenocarcinoma. To our knowledge, this is the first report of a proven prostatic origin of a CPM.