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Myelographic changes after spinal operation are often difficult to interpret especially with regard to the differentiation between arachnoiditis and recurrent disc prolapse. The radiological appearances using iophendylate (Myodil) and the distinguishing features are discussed and illustrated.

Familial polyposis coli and Gardner's syndrome have identical colonic manifestations. Recent evidence has shown that both conditions are associated with occult osteomatous lesions in the mandible. We present 3 patients from 2 families with familial polyposis coli who, in addition to the colonic lesions, also had occult osteomatous mandibular lesions. The value and practical application of radiography of the mandible as an additional diagnostic aid in familial polyposis coli are emphasized.

Two cases of leukaemic infiltration of the stomach are presented. In both patients the dominant presenting sign was gastro-intestinal bleeding. The clinical, radiological and pathological findings are presented together with a brief review of the literature.

Craniopharyngiomas present a diverse appearance on computed tomography. Histological diagnosis is not always possible, but computed tomography is of great assistance in the delineation of the tumour as well as of the degree of associated hydrocephalus. Computed tomography also enables rapid non-invasive follow-up after surgery or radiotherapy, or both.

The computed tomographic findings in 54 patients with intracranial meningioma are presented. Computed tomography is a rapid, noninvasive and highly accurate method of diagnosing intracranial meningioma and, in most cases, the findings are specific for this tumor.

The computed tomography (CT) findings in 5 patients with tuberous sclerosis are presented. CT is recommended as a rapid, non-invasive, easily repeated investigative procedure for patients with clinically suspected tuberous sclerosis and epilepsy of unknown origin.

The use of fine-needle percutaneous transhepatic cholangiography is becoming a standard procedure for investigating jaundiced patients undergoing surgery. The results of this procedure in 40 patients investigated at the Johannesburg Hospital show the importance of correlating the site of obstruction with the nature of the lesion.

A case of pneumatosis coli of the caecum and ascending colon with a closed loop obstruction secondary to carcinoma of the descending colon is presented. The caecum was grossly distended and impending rupture was diagnosed. It is postulated that complete transmural rupture of the caecum was prevented by partial decompression of caecal air into the bowel wall.