Computerized tomographic appearance of renal cysts after extracorporeal shock wave lithotripsy.

We identified cysts in five kidneys of four patients who had lithotripsy. Three of these kidneys were evaluated with CT scans the day before and the day after lithotripsy and showed no change. The other two kidneys were studied by CT only after extracorporeal shock wave lithotripsy; hemorrhage was shown in one and cyst wall thickening in the other.

Acute bilateral diffuse pulmonary shadowing after evacuation of hydatid mole.

Acute bilateral diffuse pulmonary shadowing complicates the resection of hydatid mole approximately 10% of the time. Etiologic factors include trophoblastic emboli, pulmonary emboli, high output congestive failure, and DIC. Prompt recognition and emergency oxygen therapy with PEEP are imperative for survival.

Computed tomography of low periesophageal focal fat collections.

Focal fat collections in the middle compartment of the lower mediastinum are reported in the literature. However, this explanation for a mass in that location is not widely recognized. We found four cases of focal fat collections on routine computed tomography.

Computed tomography of isolated osteoblastic colon metastases in the bony pelvis.

Skeletal metastases from colorectal carcinoma are unusual and osteoblastic metastases are quite rare. Three cases are described in which an isolated recurrence of a previous colorectal carcinoma occurred within the pelvic bones, without evidence of skeletal metastases elsewhere so that local spread via portocaval anastomoses in the pelvis is postulated. In all three cases, proliferative calcification and new bone formation occurred within an expansile, destructive lesion, suggesting the occurrence of a synergistic effect between the underlying bone and a malignant neoplasm which has a propensity to calcify.