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Ventricular System and Hydrocephalus 161

Figure 2.1.8 Presumptive Overproduction Hydrocephalus (Canine) MR
6y FS Labrador Retriever with clinical signs of
weakness and obtundation. A large, well‐
defined mass is present within the third ventri-
cle (a–d: arrow), and generalized hydrocephalus
is present (a–d: arrowheads). A solitary third
ventricle choroid plexus carcinoma was con-
firmed on postmortem examination. There was
no evidence of overt obstruction, which led to a
presumptive diagnosis of overproduction
hydrocephalus.

(a) T2, SP (b) T2, TP

(c) T1, TP (d) T1+C, TP

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