A text-book on diseases of the ear, nose and throat . Diagram of intra- and extracranial venous anastomosis. (Mace-\ven.) OTITIC PHLEBITIS, THEOMBOSIS, AND 207 removed, no matter how far such interference may lead. Operation on thesigmoid sinus cannot be jDroperly performed if less than two inches ofits bony covering be removed. As much as this should be removedTvhether the bone is diseased or not throughout this length, Chipault and Lambotte ^ have removed the bone and the sinus, afterligation of the jugular, from the bulb to the torcular, the patient recov-ering entirely. Downward,
A text-book on diseases of the ear, nose and throat . Diagram of intra- and extracranial venous anastomosis. (Mace-\ven.) OTITIC PHLEBITIS, THEOMBOSIS, AND 207 removed, no matter how far such interference may lead. Operation on thesigmoid sinus cannot be jDroperly performed if less than two inches ofits bony covering be removed. As much as this should be removedTvhether the bone is diseased or not throughout this length, Chipault and Lambotte ^ have removed the bone and the sinus, afterligation of the jugular, from the bulb to the torcular, the patient recov-ering entirely. Downward, it will serve all purposes to remove thegroove as far as and including the external margin of the jugular fora-men, great care being taken to avoid the posterior condylar foramen be-hind and the lower third of the Fallopian canal in front. In most instancesthe thrombus is situated in the descending portion of the sigmoid sinus Fig. Cast of the middle ear and mastoid, seen from without. (F. Siebenmann.) 1, upper externalhorizontal cells, squamomastoid : 2, anterior upper horizontal cells, squamomastoid : 3, upper malleo-incudal space, attic; 4, external malleo-incudal fold ; 5, lower malleo-incudo-squamous space, lowerattic ; 6, upper pouch of the membrana , 7, tubal cells ; 8, tympanic cells, floor of drum-cavity overthe jugular bulb ; 9, Eustachian tube ; 10, petrosal sinus, and 11, transverse sinus, lying together in thejugular fossa. extending to the knee, rarelj^ far beyond it into the lateral sinus, andthence downward towards the bulb, and sometimes farther downwardinto the jugular vein. Knapp observed a case of thrombosis of the leftlateral sinus which extended all the way around through the torcular tothe right lateral sinus. When the thrombus is incomi^lete or parietal, it is hard to blood still flows through the sinus, the aspirating needle is of no as-sistance. Inspection will not aid. as
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