Rare feline skull vascular lesion tied to hydrocephalus case
Bottom line
A new case report in Veterinary Radiology & Ultrasound describes what the authors say is the first reported feline case of occipital bone angiomatosis occurring with a chronic subdural hematoma, together causing severe compression of the cerebellum and brainstem, plus obstructive hydrocephalus, in a 2-year-old cat. The cat presented with neurologic signs including cautious ambulation, head shaking, and lethargy. The report adds an unusual vascular-bone lesion to the differential list for young cats with progressive intracranial signs and marked caudal fossa mass effect on advanced imaging. (onlinelibrary.wiley.com)
Why it matters: For veterinary professionals, the case is a reminder that severe posterior fossa compression and hydrocephalus in a young cat may not be explained by congenital malformation or more familiar neoplasia alone. Bone angiomatosis is rare, and published human literature suggests these lesions can be locally destructive and highly vascular, which may help explain how an associated chronic hemorrhagic process could develop. In practice, that raises the stakes for MRI or CT interpretation, surgical planning, prognosis discussions, and referral decisions when imaging shows occipital bone change alongside extra-axial fluid or hemorrhagic material. (pubmed.ncbi.nlm.nih.gov)
What to watch: Whether additional feline cases clarify imaging hallmarks, pathogenesis, and whether decompression or other interventions can improve outcomes in similar patients. (onlinelibrary.wiley.com)
Key facts
- Journal
- Veterinary Radiology & Ultrasound
- Case type
- First reported feline case
- Condition
- Occipital bone angiomatosis with chronic subdural hematoma
- Patient
- 2-year-old cat
- Clinical signs
- Cautious ambulation, head shaking, and lethargy
- Major effects
- Severe cerebellar and brainstem compression, and obstructive hydrocephalus
- Differential takeaway
- Add vascular bone lesions to the differential for young cats with progressive intracranial signs and caudal fossa mass effect
A newly published feline case report in Veterinary Radiology & Ultrasound details an exceptionally rare intracranial presentation: occipital bone angiomatosis with a concomitant chronic subdural hematoma in a 2-year-old cat, resulting in severe cerebellar and brainstem compression and obstructive hydrocephalus. According to the journal listing and abstract, the cat presented with cautious ambulation, head shaking, and lethargy, and the authors describe it as the first reported case of this combination in a cat. (onlinelibrary.wiley.com)
What makes the case notable is the overlap of several uncommon findings in a young patient. In cats, hydrocephalus and caudal fossa disease often push clinicians first toward congenital, inflammatory, traumatic, or neoplastic differentials. Standard neurology references note that hydrocephalus can progress over time and that cerebellar or brainstem disease may produce abnormal head movement, ataxia, altered mentation, and balance deficits, all of which fit the report’s clinical picture. (merckvetmanual.com)
The report also expands the conversation around skull-based vascular lesions. Human literature describes cystic angiomatosis and related intraosseous vascular malformations of craniofacial and occipital bones as rare, potentially progressive lesions that can produce bony expansion, osteolysis, vascularity, and, in some cases, intracranial complications. While those are not direct analogs for feline disease, they provide useful context for why an occipital bone lesion could become clinically significant, especially in the confined space of the caudal cranial fossa. (pubmed.ncbi.nlm.nih.gov)
The key clinical takeaway is the combined mass effect. The abstract indicates that the occipital bone angiomatosis was associated with a chronic subdural hematoma, and together they caused severe compression of the cerebellum and brainstem, as well as obstructive hydrocephalus. Chronic subdural hemorrhagic collections are themselves uncommon in veterinary neurology case literature, and posterior fossa subdural hematomas are rare even in human medicine, where they are recognized as potentially dangerous because relatively small lesions can obstruct CSF pathways and compress vital structures. (onlinelibrary.wiley.com)
I didn’t find a press release or public expert commentary specific to this paper, which is common for single case reports in specialty journals. Still, the broader literature supports the authors’ framing of the case as unusual. The Wiley table-of-contents entry places the report among other advanced imaging case studies in Veterinary Radiology & Ultrasound, reinforcing its value primarily as a diagnostic and neuroradiologic contribution rather than a practice guideline or treatment study. (onlinelibrary.wiley.com)
Why it matters: For veterinary professionals, this is a useful reminder to widen the differential list when a young cat has progressive neurologic signs and imaging evidence of caudal fossa crowding, extra-axial hemorrhagic material, or occipital bone remodeling. The case suggests that a vascular osseous lesion may coexist with, or possibly contribute to, chronic subdural bleeding. That inference is biologically plausible given the vascular nature of angiomatous bone disease described in human reports, although the feline paper itself appears to be a single-case description rather than proof of mechanism. For clinicians, that distinction matters when discussing uncertainty, procedural risk, and prognosis with pet parents. (pubmed.ncbi.nlm.nih.gov)
From a workflow standpoint, the case underscores the value of advanced imaging review that includes the calvarium as well as the intracranial compartment. If occipital bone pathology is overlooked, clinicians may underappreciate the source of compression or the possibility of a highly vascular lesion. That has implications for referral timing, anesthesia planning, decompressive decision-making, and whether histopathology or postmortem evaluation is pursued to refine diagnosis. (merckvetmanual.com)
What to watch: The next step is whether additional case reports establish a more reproducible imaging pattern, clarify the relationship between angiomatosis and hemorrhage, and show which management strategies, if any, offer meaningful neurologic improvement in similar feline patients. (onlinelibrary.wiley.com)