The influence of body position on volume and x-ray attenuation of the lungs of three Beagles was investigated with computed tomography. In left and-right lateral recumbency, the dependent lung had decreased volume and increased x-ray attenuation compared with ventral recumbency. Volume and x-ray attenuation of the nondependent lung, however, were unchanged. In dorsal recumbency, there was a vertical gradient of x-ray attenuation being increased dorsally and decreased ventrally compared with ventral recumbency where regional differences in x-ray attenuation were not found. Result's indicate a risk of overlooking a mass in the dependent pulmonary parenchyma of dogs in lateral and dorsal recumbency. Regional differences in x-ray attenuation of the lungs of dogs can be avoided if the radiographs are obtained with the dog in ventral recumbency.

The roentgenologic and anatomical appearances of the left gonadal vein were discussed by the present authors in two previous papers (1965). It was stated in the first paper that at aortography retrograde contrast filling of the left gonadal vein occurred in men as well as in women and this was considered in relation to the anatomical conditions present in an autopsy material. An absence of valves or incompetent valves in the cranial portion of the gonadal vein existed in more than half of the cases, equally divided according to sex. Valves were more often absent in the men while the women more often had incompetent valves. The width of the left gonadal vein was more closely analyzed in the second paper; the mean circumference figures indicated that the ovarian vein was significantly wider than the spermatic vein and that pregnancy was a contributory factor in this difference. The close relationship between pregnancy and permanent widening of the ovarian vein was discussed. HODGKINSON (1953) measured the width of the ovarian vein during operation in 8 pregnant women. These measurements were made in 6 instances on the left side, in one on the right and in one instance bilaterally; in all of them the

No abstract

In earlier reports ( A h l b e r g , B a r t l e y and C h i d e k e l ) it has been shown that at aortography retrograde contrast filling of the left gonadal vein occurs in both men and women, that the anatomic basis for this finding consists of either the absence of valves in the gonadal vein ostium (most common in men) or incompetent valves in the gonadal vein (most common in women), that the ovarian vein is statistically significantly wider than the spermatic vein and that the ovarian vein is wider and more often has incompetent valves in relation to multiple pregnancy than to no more than one pregnancy.With these facts as a background it was questioned whether or not the retrograde flow in the left gonadal vein could have pathological importance in relation to, for example, the occurrence of pelvic varicosities in women. In order to study this problem the cooperation of a gynzcologist (K.-0. E d l u n d h ) was elicited to make clinical examinations and to remit patients for r e n tgenological investigation.Technique. Selective venography of the left renal vein was performed after direct puncture of the femoral vein. Complications were not encountered.The nzatcrial comprised 45 patients. At clinical examination the possibility of pelvic varicosities was considered for 34 of these. In 21 of the 45 patients pelvic varicosities were observed rcciitgenologically. The mean diameter of the ovarian veins in

1. Finger plethysmograms were recorded in patients catheterized for diagnostic purposes. 2. They disclosed a rapidly occurring and passing volume increase of the finger in connection with rapid flushing with saline or movements of the catheter against the vascular wall. 3. Arterial pulse curves from the arm, recorded intra‐ or extra‐arterially, showed no effects on the blood pressure from the flushings or catheter manipulations. 4. The response was also obtained peripheral to an obstruction of the circulation in the arm. 5. The reaction is proposed to be due to a reflex produced by stimulating stretch receptors in the vascular system. 6. The reaction was obtained not only when stimulating known reflexogenic areas but also when stimulating other large central arteries and veins.