17 years old with abdominal mass and 1 episode of fits
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abdominal mass seizure 17 year old neurocysticercosis CT brain findings
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CT Brain Analysis - 17-year-old with Abdominal Mass + 1 Seizure
CT Findings
Looking at the brain CT (non-contrast + contrast series), the key findings are:
- Multiple hyperdense (calcified) foci scattered in the brain parenchyma - best visible on the axial cuts
- Ring-enhancing or nodular lesions - seen in some slices suggesting active/transitional stages
- No significant midline shift - the ventricles appear symmetric
- Perilesional edema around some lesions - suggests cysts at the colloidal/degenerating stage
- The top-left image appears to show a different study (possibly an abdominal/chest image or angiogram - this is the circular bright image in the upper-left corner)
Most Likely Diagnosis: Disseminated Cysticercosis (Neurocysticercosis + Abdominal cysticercosis)
The combination of:
- Abdominal mass (subcutaneous or muscular cysticercal cyst - palpable nodules are a classic finding)
- New-onset seizure in a teenager
- Multiple lesions on CT brain at various stages
...is the classic triad of systemic/disseminated Taenia solium cysticercosis.
CT Stages of Neurocysticercosis (Harrison's 2025)
| Stage | CT Appearance | Significance |
|---|---|---|
| Vesicular | Cystic lesion, scolex visible as small hyperdense dot ("hole-with-dot" sign), no edema | Living larva - treat |
| Colloidal | Peripheral ring enhancement, surrounding edema | Degenerating larva - treat |
| Granulonodular | Homogeneous enhancement, no edema | Dying larva - treat selectively |
| Nodular-calcified | Hyperdense calcification, no enhancement | Dead parasite - NO anticysticidal therapy needed |
This patient's CT shows lesions in multiple stages - a hallmark of neurocysticercosis (unlike a single pathology that would all be at one stage).
Management
1. Anticonvulsant therapy - initiated immediately given the seizure episode
- Options: Levetiracetam, Carbamazepine, or Valproate
- Continue until lesion resolves on follow-up CT/MRI AND seizure-free for 24 consecutive months (Harrison's 2025)
2. Antihelminthic therapy (based on stage):
- 1-2 parenchymal cysts: Albendazole monotherapy - 15 mg/kg/day in 2 divided doses x 10-14 days
- >2 viable cysts: Albendazole + Praziquantel combination - Praziquantel 50 mg/kg/day x 10-14 days
- Calcified lesions: NO antihelminthic therapy needed
3. Corticosteroids - Prednisone or Dexamethasone started BEFORE anticysticidal therapy to reduce the inflammatory response as parasites degenerate (can worsen edema/seizures if not covered)
4. Ophthalmology review - Fundoscopy is mandatory in all suspected neurocysticercosis before treatment (ocular cysts can rupture with antihelminthics, causing blindness)
Work-up Recommended
| Investigation | Purpose |
|---|---|
| MRI brain with contrast | Better characterization of lesion stages (especially scolex detection) |
| Serum ELISA/immunoblot (enzyme-linked immunotransfer blot) | Confirmatory serology for NCC |
| Stool examination | Taeniasis in patient or household contacts |
| Abdominal ultrasound/CT abdomen | Characterize the abdominal mass - likely cysticercal cyst in muscle/subcutaneous tissue |
| Fundoscopy | Rule out ocular cysticercosis before treatment |
| EEG | Baseline before anticonvulsant therapy |
| CBC, LFT, RFT | Before starting albendazole |
Key Points
- Neurocysticercosis is the most common parasitic CNS disease worldwide and the leading infectious cause of epilepsy in the developing world (Red Book 2021; Harrison's 2025)
- The abdominal mass in this context is most likely a soft tissue cysticercal cyst (subcutaneous/intramuscular) rather than a tumor - these are palpable nodules common in disseminated disease (Fischer's Surgery)
- The patient likely ingested T. solium eggs through fecal-oral contamination (not undercooked pork - that causes taeniasis; eggs cause cysticercosis)
- T. solium is endemic in South Asia, Latin America, sub-Saharan Africa, and Eastern Europe
Important: Rule out ocular cysticercosis before starting antiparasitic drugs - if intraocular cysts are present, treatment can cause acute inflammation and permanent vision loss.
Sources: Harrison's Principles of Internal Medicine 22E (2025), Red Book 2021, Medical Microbiology 9e
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