Bochdalek’s flower basket: applied neuroimaging morphometry and variants of choroid plexus in the cerebellopontine angles

Introduction

Protrusions of fourth ventricular choroid plexus through the foramina of Luschka are called ??Bochdalek??s flower basket?? (BochFB). The bulbous terminal expansions (cornucopiae) extend into the cerebellopontine angle (CPA) cisterns. We studied and reviewed the normal imaging anatomy, morphometry and anatomical variants of BochFB.

Methods

We retrospectively analysed normal brain imaging findings on axial pre- and post-contrast CT scans and enhanced axial T1-weighted MRIs of 200 patients. We assessed BochFB for: (a) calcification, (b) lateral extension, (c) enhancement pattern, (d) cornucopiae shape, (e) symmetry and (f) proximity to tortuous vertebral arteries and morphometry of cornucopiae size and length of BochFB limbs.

Results

BochFB calcification was found in 38?% of patients aged over 51?years. Lateral extension of BochFB into the CPA cistern was prominent in 75?% on CT and 96?% on MRI. The mean length of these extensions was 23.6?mm. BochFB enhanced strongly in 47?% on CT and 66?% on MRI. The BochFB cornucopiae were bulbous in 51?% on CT and 54?% on MRI. The mean width of bulbous cornucopiae was 3.5?mm. Bilateral BochFB symmetry was found in 71?% on CT and 80?% on MRI. Six to 8?% of tortuous left vertebral arteries were close to BochFB.

Conclusion

The cornucopiae are particularly well demonstrated on post-contrast MRI. However several sources of error in image interpretation may arise when imaging the normal BochFB on routine head CT and MRI. Difficulties in analysis arise especially on CT because of physiologic calcification, asymmetry, and the bulbous cornucopiae being mistaken for aneurysms.     

Cystic lymphangioma of the abdominal cavity. Report of 11 cases

OBJECTIVE: Our aim was to assess the epidemiological particularities, the circumstances of the diagnosis and the therapeutic indications of the cystic lymphangioma of the abdominal spaces. METHODS: Our retrospective and analytic survey concerns 11 cases of cystic lymphangioma of the abdominal spaces: mesentere 6 cases, epiploon 1 case, retroperitoneum 3 cases and under peritoneum 1 case. The incidence was of 1/2476 hospitalizations (0.04%). RESULTS: The median age was 28 years. The sex-ratio was of 1.2. The main circumstance of discovery of the cystic lymphangioma was an abdominal mass in 7 cases. The other circumstances were: a pseudoappendicular syndrome, an ascitis, a disembowelment and a direct traumatism of the abdomen. Total resection of the cystic lymphangioma was performed in 7 cases. In 4 cases a simple enucleation and in 3 cases a resection of a segment of the organ that supports the lymphangioma. Only a partial resection of the lymphangioma has been achieved for the remnant patient. A cystic lymphangioma relapsed 13 years after a total resection in one case. Mortality rate was nul. CONCLUSION: The circumstances of diagnosis of the cystic lymphangioma were in relation with the volume of the tumor or a mechanical, infectious or hemorrhagic complications. The recidivism after a total resection let evoke the possibility of multiple and diffuse cystic lymphangioma.     

Clinical review: Imaging in ischaemic stroke--implications for acute management

Imaging has become a cornerstone of stroke management, translating pathophysiological knowledge to everyday decision-making. Plain computed tomography is widely available and remains the standard for initial assessment: the technique rules out haemorrhage, visualizes the occluding thrombus and identifies early tissue hypodensity and swelling, which have different implications for thrombolysis. Based on evidence from positron emission tomography (PET), however, multimodal imaging is increasingly advocated. Computed tomography perfusion and angiography provide information on the occlusion site, on recanalization and on the extent of salvageable tissue. Magnetic resonance-based diffusion-weighted imaging (DWI) has exquisite sensitivity for acute ischaemia, however, and there is increasingly robust evidence that DWI combined with perfusion-weighted magnetic resonance imaging (PWI) and angiography improves functional outcome by selecting appropriate patients for thrombolysis (small DWI lesion but large PWI defect) and by ruling out those who would receive no benefit or might be harmed (very large DWI lesion, no PWI defect), especially beyond the 3-hour time window. Combined DWI-PWI also helps predict malignant oedema formation and therefore helps guide selection for early brain decompression. Finally, DWI-PWI is increasingly used for patient selection in therapeutic trials. Although further methodological developments are awaited, implementing the individual pathophysiologic diagnosis based on multimodal imaging is already refining indications for thrombolysis and offers new opportunities for management of acute stroke patients.     

Digestive complications of biliary gallstone lost during laparoscopic cholecystectomy

A patient was admitted because of an intestinal obstruction. Eight years before, he underwent a laparoscopic cholecystectomy. Abdominal ultrasonography and small bowel series showed a gallstone in the small bowel that computed tomography scan failed to identify. Laparotomy showed a Meckel's diverticula and a biliary stone in the terminal ileum. In the literature, it has been shown that gallstone lost during laparoscopic cholecystectomy may be responsible for intraperitoneal abscess. In the contact of intestine, the stone may induce an obstructive abscess, a communicating abscess, a digestive fistula or a biliary ileus. During the postoperative course of laparoscopic cholecystectomy, these patients suffer from abdominal pain and fever lasting from few days to several months. Imaging shows the biliary gallstone mechanical complications induced by the stone. To avoid such complications, biliary gallstone that falls into the peritoneum during laparoscopic cholecystectomy should be removed under laparoscopy.     

Hypothermic cardiac arrest far away from the center providing rewarming with extracorporeal circulation

A transorbital penetrating intracranial injury is a rare and severe traumatic brain injury. Patients with this type of injury may present dramatically, but often the injury is subtle and therefore easily overlooked and not recognized in the first place. We present the case of a 45-year-old female admitted to the emergency department after she fell with her bike and the bicycle brake handle penetrated her left eye. A computerized tomography of the cerebrum showed a fracture of the superior orbital roof with multiple bone fragments extending into the brain near the circle of Willis. A pneumocephalus and traumatic frontobasal, intraventricular and subdural hemorrhage was seen. The patient deteriorated suddenly and was transferred to a neurosurgical center where she underwent an emergency craniotomy with evacuation of the intracerebral hematoma and an intraventricular drain was placed. After surgery, the patient’s condition deteriorated, and total compression of the brain stem occurred, upon which the patient was declared brain dead. Our case report shows that the Glasgow Coma Scale score at admission is not always a good predictor of the severity of the injury. Even when there is minimal suspicion of a penetrating intracranial injury, a computerized tomography should be performed immediately, independent of the patient’s Glasgow Coma Scale score. A direct transfer to a specialized neurosurgical center is recommended because this injury often results in death due to fatal complications such as intracerebral hemorrhage, pneumocephalus and brain stem injury.     

Liver transplant from a donor with occult HEV infection induced chronic hepatitis and cirrhosis in the recipient

Acute hepatitis E virus (HEV) infection is a self-limiting symptomatic or asymptomatic disease. However, as recently observed, it can manifest itself as chronic hepatitis in patients receiving solid organ transplants as well as in patients with HIV infection or severe hematologic disorders. Here, we describe the clinical course of a 73-year-old male patient in whom HEV transmission occurred after receiving a HEV-infected liver from a donor with occult HEV infection, whereby the patient had tested negative for HEV RNA and anti-HEV antibodies shortly before explantation. Anti-HEV IgG, IgM, and HEV RNA were detected in the first tested serum sample of the liver recipient obtained 150 days after liver transplantation and remained positive (earlier samples after OLT were not available). Liver cirrhosis developed within 15 months and the patient died of septic shock. Based on phylogenetic analyses of the donor and recipient's HEV strains, we were able to prove that the occult HEV infection was transmitted via the graft.