Intracerebral Masson's Tumor-Slow-Filling Vascular Lesion Demonstrated by Indocyanine Green Video Angiography

Case report: Multiple brain intravascular papillary endothelial hyperplasia: incidence, diagnostic challenges, and management approach

Multiple hemorrhagic brain lesions are mainly diagnosed based on clinico-radiological features integrated with histological data. Intravascular papillary endothelial hyperplasia (IPEH), or Masson's tumor, is a very rare entity, particularly when localized in the brain. In this study, we describe a case of multiple recurrent brain IPEHs and provide details on the diagnostic phase, therapeutic approaches, and related challenges. A 55-year-old woman presented with a relapsing neurological deficit. Brain magnetic resonance imaging (MRI) revealed a hemorrhagic right frontal-parietal lesion. When new neurological symptoms occurred, subsequent MRI scans detected more bleeding cerebral lesions. She underwent a series of single hemorrhagic lesion debulking. For any samples that underwent histopathological examination, the first results were not informative; the second and the third results revealed hemangioendothelioma (HE); and the fourth results led to the IPEH diagnosis. Interferon alpha (IFN-α) and subsequently sirolimus were prescribed. Both were well tolerated. Clinical and radiological features remained stable 43 months after starting sirolimus therapy and 132 months after the first diagnosis. To date, 45 cases of intracranial IPEH have been reported, mostly as single lesions without parenchymal location. They are usually treated by surgery and sometimes by radiotherapy upon recurrence. Our case is notable for two main reasons: because of the consecutive recurrent multifocal exclusively cerebral lesions and the therapeutic approach we used. Based on multifocal brain recurrence and good performance, we propose pharmacological therapy, including IFN-α and sirolimus, to stabilize IPEH.

Intraventricular Masson tumor: case report and systematic review of primary intracranial intravascular papillary endothelial hyperplasia

Intracranial Masson tumor (intravascular papillary endothelial hyperplasia, IPEH) is a benign lesion that is thought to originate from a reactionary process in response to compromised blood flow. IPEH may be classified into one of three subtypes based on etiology as it may result from the excessive proliferation of endothelial cells within a normal vessel (primary), vascular malformation (type II), or organized hematoma (type III). We report the case of a 79-year-old woman who presented with confusion, gait instability, and urinary incontinence. Neuroimaging revealed a hemorrhagic lesion within the right lateral ventricle, which was successfully resected. To our knowledge, this is the first reported case of an intraventricular IPEH and 33rd case of primary intracranial IPEH. We further performed a systematic review of the literature on all prior type I intracranial IPEH cases and discuss the importance of long-term follow-up in intracranial IPEH.

Masson's tumor presenting as a left frontal intraparenchymal hemorrhage resulting in severe expressive aphasia during pregnancy: case report

Intravascular papillary endothelial hyperplasia (IPEH), commonly known as Masson's tumor, is a benign lesion that manifests as an excessive proliferation of endothelial cells within a vessel wall. IPEH is extremely rare in the brain, with only 36 intracranial cases previously described in the literature. It is commonly mistaken for more malignant pathologies, such as angiosarcoma. Careful histopathological examination is required for diagnosis, as no clinical or radiographic features are characteristic of this lesion. In this first published case of intracranial IPEH presenting during pregnancy, the authors describe a 32-year-old female with a left frontal intraparenchymal hemorrhage resulting in complete expressive aphasia at 28 weeks 6 days' gestation. An MRI scan obtained at a local hospital demonstrated an area of enhancement within the hemorrhage. The patient underwent a left frontoparietal craniotomy for hematoma evacuation and gross-total resection (GTR) of an underlying hemorrhagic mass at 29 weeks' gestation. This case illustrates the importance of multidisciplinary patient care and the feasibility of intervention in the early third trimester with subsequent term delivery. While GTR of IPEH is typically curative, the decision to proceed with surgical treatment of any intracranial lesion in pregnancy must balance maternal stability, gestational age, and suspected pathology.