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The recent development of high-frequency ultrasound, associated with the improved sensitivity in color Doppler, enabled the identification of various skin structures and layers. In basal cell carcinoma, the 22 MHz frequency ultrasound permits the delimitation of tumor margins, while color Doppler, determines its vascularization. We present two cases in which the association of both exams allowed an in vivo analysis of the tumor's morphology, size, thickness and vascularization, thus contributing to a better pre-operative evaluation.

The worldwide incidence of basal cell carcinoma (BCC) has increased significantly in recent decades. [1][2][3] BCC is an epithelial malignancy that accounts for 75%-80% of all skin tumors in fair-skinned adults.It usually affects sun-exposed areas of the skin; the face is the most prevalent site of involvement. 4 Although BCCs grow slowly, they may be locally invasive and destructive.The main goal of primary BCC treatment is to completely eradicate the tumor with maximal preservation of function and cosmesis. 5 Treatment can be medical or surgical. Because of the likelihood of local recurrence, 6,7 surgical treatment is recommended. 5 However, overestimation of tumor size can lead to poor cosmetic outcomes. Conversely, incomplete excision can induce changes in tumor structure, leading to more aggressive tumor behavior. 7,8 In cases that are treated non-surgically, therapeutic success also depends on proper assessment of lesion depth. Thus, determinating the extent of tumor depth may help clinicians to select the optimal approach to treatment and the likelihood of achieving a negative resection margin. 6

Kaposi sarcoma (KS) is a fulminate and disseminated form of acquired immunodeficiency syndrome (AIDS)-defining neoplasm, usually presenting pulmonary involvement. We report a 40-year-old woman with AIDS and biopsy-proven KS showing unusual high-resolution computed tomography (HRCT) findings. HRCT showed areas of ground-glass attenuation with superimposed septal thickening ("crazy-paving" pattern). CT-pathologic correlation revealed that crazy-paving pattern in this case was due to accompanying pulmonary edema and hemorrhage in addition to tumor cell infiltration into the peribronchovascular interstitium, interlobular and alveolar septa. The authors suggest the inclusion of KS in the differential diagnosis of lung diseases in patients with AIDS presenting with crazy-paving pattern on the HRCT.