Unrelated to the parenchyma of an organ.
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The tumor infiltrated the surrounding parotid gland, but no extraparenchymal extension was seen.
Bandres JC, White AC Jr, Samo T, et al: Extraparenchymal neurocysticercosis: report of five cases and review of management.
49 Extraparenchymal 3 (4) 0 Mixed 8 (11) 0 Lesion stage Cystic only 22 (31) 1 (7) 0.
An extraparenchymal CT finding that can be identified as early as 90 minutes (6,7) after symptom onset is the "hyperdense vessel sign" (Figure 3), which is usually seen in the proximal (M1 segment) MCA, but can be seen in any arterial structure.
Patients with active parenchymal or extraparenchymal disease defined by the neuroradiographic appearance of the lesions can be treated with albendazole, 15 mg/kg/day, divided into 2 daily doses for 8 days.
Extraparenchymal infection, particularly intraventricular disease with resultant hydrocephalus, has been associated with a poorer prognosis (13-15).
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