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A 47-year-old, previously healthy farmer from Grafton, N.S.W. in Australia, developed loin pain and hematuria 2 months after minor trauma to his loin. A renal cyst was found by ultrasound and arteriography. At operation, a thick-walled cyst containing 800 ml of clotted blood was excised together with a small wedge of kidney. Ring-like structures measuring 70 X 45 mu were found in the fibrous cyst wall and in the surrounding fat. These birefringent double-walled "rings" with equally spaced radial striations were identified as the eggs of Dioctophyma renale.

Oral administration of either Mebendazole or Fenbendazole at 50 mg/kg body weight was effective in killing a 7-hr Trichinella spiralis infection in mice. Adult worms, 72 hr postingection, were unaffected by the same dose of Fenbendazole, while Mebendazole showed partial activity. Both Mebendazole and Fenbendazole were active against developing muscle larvae. Mebendazole was effective against encysted muscle larvae while 50 mg of Fenbendazole per kg per day for 7 days from 28 days postinfection failed to have any effect on this stage of the life-cycle.

Two cases of primary fibroma of infancy are described; one was a solitary tumour arising in the left ventricle and interventricular septum and the other consisted of multiple fibromatous tumours in the right ventricle and interventricular septum.