A 58-year-old man with a 15-year history of uncontrolled hypertension (BP 180/110 mmHg) presents to the emergency department with sudden-onset severe occipital headache, vomiting, and neck stiffness. His wife reports he was watching television when he suddenly collapsed. On examination, he is drowsy (GCS 13/15), has bilateral papilledema, and a positive Kernig's sign. Non-contrast CT head shows a hyperdense lesion in the basal ganglia with intraventricular extension and hydrocephalus. What is the most likely source of bleeding in this patient?

Explanation

## Clinical Diagnosis: Hypertensive Intracerebral Hemorrhage ### Key Pathophysiology **Key Point:** Chronic hypertension causes lipohyalinosis of small penetrating arteries, leading to formation of Charcot-Bouchard aneurysms — microaneurysms that rupture spontaneously, typically in deep brain structures. ### Location-Specific Hemorrhage Patterns | Hemorrhage Type | Common Sites | Typical Presentation | Causative Lesion | |---|---|---|---| | Hypertensive ICH | Basal ganglia (putamen), thalamus, pons, cerebellum | Gradual onset, headache, focal deficits | Charcot-Bouchard aneurysm | | Subarachnoid (aneurysmal) | Circle of Willis, anterior communicating artery | Thunderclap headache, meningismus, sentinel bleeds | Saccular berry aneurysm | | AVM-related | Lobar, variable | Young patient, recurrent bleeds, seizures | Abnormal vascular malformation | | Mycotic aneurysm | MCA branches, distal vessels | Fever, sepsis, endocarditis history | Septic emboli | ### Why This Case Points to Charcot-Bouchard Aneurysm 1. **Long-standing uncontrolled hypertension** — the primary risk factor for lipohyalinosis 2. **Basal ganglia location** — classic site for hypertensive hemorrhage (putamen most common) 3. **Intraventricular extension** — deep hemorrhages often rupture into ventricles 4. **Age and demographics** — typical for chronic hypertensive disease **High-Yield:** Hypertensive ICH accounts for ~50% of all intracerebral hemorrhages in developing countries (India, Southeast Asia) where hypertension control is suboptimal [cite:Harrison 21e Ch 451]. ### Clinical Pearl **Clinical Pearl:** The presence of **hydrocephalus** and **intraventricular hemorrhage** in a hypertensive patient with basal ganglia bleeding is pathognomonic for Charcot-Bouchard rupture. These aneurysms are microscopic (<1 mm) and cannot be seen on angiography — diagnosis is clinical. ### Management Implications - **Acute:** Blood pressure lowering (target MAP reduction 10–20% in first hour), reversal of anticoagulation if present, ICU monitoring - **Imaging:** CT angiography/perfusion to rule out underlying structural lesion if atypical location - **Long-term:** Aggressive BP control to prevent recurrence **Mnemonic:** **CHARCOT** = **C**hronic **H**ypertension **A**neurysm **R**upture **C**auses **O**ccipital/basal **T**raumatic hemorrhage