In a series of 28 patients with solitary solid thyroid masses, 10 of the patients had a mass surrounded by a rim of decreased echoes or by an echo-free rim, previously termed the halo sign. Eight of these lesions were benign, being either adenomas or benign nodules; however, two halos were also demonstrated surrounding proven carcinomas. The presence of the halo in both benign and malignant disease is illustrated, and the possibility of pericapsular inflammatory infiltrate as its underlying anatomic correlate is suggested.

Abstract.We report two patients with h e m o t h o r a x as a complication of costal cartilaginous exostoses. Key words:

Cysts arising from the spleen are much less common than those arising from other organs such as kidney, liver, and ovary (1). Hemorrhagic cysts of the spleen are rare (1), but we have encountered two patients with this entitiy. The ultrasonograms in each patient demonstrated gravity-dependent layering of two fluids of distinctly different echogenicity. The fluids were contained within a spherical mass. Acoustic enhancement was exhibited behind the mass in each case. This suggested the diagnosis of hemorrhagic cyst.