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Local response to treatment is defined as: [citation needed] a. complete response, defined as complete disappearance of all known lesions (absence of tumor enhanced areas, reflecting total tumor necrosis) and absence of other new lesions determined by two observations not less than 4 weeks apart; b. partial response, defined as more than 50% ...
Figure 8. Cortical solid mass, which later was shown to be renal cell carcinoma. Measurement of the solid mass on the US image is illustrated by '+' and a dashed line. [1] Figure 9. Renal cell carcinoma with both cystic and solid components located in the cortex. Measurement of tumor on the US image is illustrated by '+' and a dashed line. [1]
In contrast, tissues with lower echogenicity are called "hypoechoic" and are usually represented with darker colors. Areas that lack echogenicity are called "anechoic" and are usually displayed as completely dark. [1]
A 48-year-old male patient post total thyroidectomy with PTC recurrence. a Transverse greyscale ultrasound of the neck demonstrates a left thyroid bed heterogeneous, predominantly hypoechoic irregular lesion with calcifications (white arrow). b A spot image of iodine 123 total body scan of the neck demonstrate a focus of abnormal radiotracer ...
However focal hypoechoic lesions can occur, hemorrhage and necrosis are rare. At times, the sonographic appearance of lymphoma is indistinguishable from that of the germ cell tumors [Fig. 8], then the patient's age at presentation, symptoms, and medical history, as well as multiplicity and bilaterality of the lesions, are all important factors ...
There is a possible association between ultrasound-detected fetal CPCs and Trisomy 18. [6] [7] It is not correlated to the presence of Trisomy 21 (Down syndrome).[8] [9] Therefore, genetic counseling is often recommended to provide more information about fetal CPCs, to answer questions and concerns, and to outline available options such as amniocentesis or a blood test from the mother.
On ultrasound, HCC often appears as a small hypoechoic lesion with poorly defined margins and coarse, irregular internal echoes. When the tumor grows, it can sometimes appear heterogeneous with fibrosis, fatty change, and calcifications. This heterogeneity can look similar to cirrhosis and the surrounding liver parenchyma.
An ultrasonographic examination reveals poor blood flow, a hypoechogenic region corresponding to the fingerlike projections, and a hypoechoic tumoral lesion affecting the nail matrix. [6] The diagnosis of onychomatricoma is confirmed by its unique histological characteristics. [2]