Breast MR imaging in a patient with unilateral axillary lymphadenopathy and unknown primary malignancy.

Bilateral invasive breast cancers were detected on MR imaging in a patient with left unilateral axillary lymphadenopathy and normal findings at physical examination, mammography, and ultrasound of both breasts. One spiculated and a second ill-defined enhancing lesion in the left breast as well as a superficial circumscribed lesion in the right breast were proven to be invasive malignancies. In patients with isolated axillary lymph nodes and occult primary malignancy, breast MRI can identify or exclude the breast as primary site, which proves the superiority and diagnostic benefit of this imaging method and also its contribution to the therapeutic approach.

Patterns of axillary lymph node metastasis in breast cancer.

The pattern of axillary lymph node involvement was analyzed in a review of 377 cases of T1-4 breast cancers. Clinical judgment of the axillary status proved to be wrong in approximately one-third of the cases. In univariate analysis, a strong correlation (P < .01) between the number of involved nodes, tumor size, and blood vessel invasion was found. Other features of the primary tumor (lymphatic invasion, degree of differentiation, presence of necrotic areas) were related to a lesser degree (P < .05). While others (age, site) were not at all significant. However, the number of nodes resected proved to be the most important determinant of all (P = .003). Also, the simple distinction between node-negative and node-positive cases is strongly dependent on the extent of axillary dissection (P = .009). In multivariate analysis, only the number of resected nodes and T stage showed a good relationship with the number of positive nodes. Skip metastases above levels 1 and 2 were seen in only 2% of the cases. A clear influence of the number of invaded nodes on survival could be demonstrated. These findings are discussed, especially as concerns the technique, prognostic significance, and therapeutic usefulness of axillary dissection.

Adjuvant radiation after conservative surgery for early breast cancer. Local control and cosmetic outcome.

Between 1980 and 1987, 115 patients with early breast cancer underwent conservative surgery and radiation therapy. Median follow-up from the date of surgery was 48 months. There was local recurrence in 5 of the 115 patients. Of this group, 67 patients were evaluable for cosmetic outcome. The overall cosmetic result was judged by a panel to be excellent or good in 61%, fair in 27%, and poor in 12%. Patients themselves found the cosmetic result to be excellent or good in 94%. Retraction of the inferior border of the breast, surface difference between both breasts, breast induration, scar retraction and telangiectasia correlated with the cosmetic score. Type of surgery, axillary irradiation, use of bolus, and length of follow-up all influenced the cosmetic outcome in a univariate analysis.

Interactive use of on-line portal imaging in pelvic radiation.

We have evaluated a fluoroscopic on-line portal imaging system in routine clinical radiotherapy, involving the treatment of 566 pelvic fields on 13 patients. The image was typically generated by delivering a radiation dose of 6-8 cGy. Comparison between portal image and simulator film was done by eye and all visible errors were corrected before continuing irradiation. If possible, these corrections were performed from outside the treatment room by moving the patient couch by remote control or by changing collimator parameters. Adjustments were performed on 289/530 (54.5%) evaluable fields or 229/278 (82.4%) evaluable patient set-ups. The lateral couch position was most frequently adjusted (n = 254). The absolute values of the adjustments were 6.8 mm mean (SD 6.6 mm) with a maximum of 40 mm. All absolute values of adjustments exceeding 25 mm were recorded in one patient and those exceeding 15 mm were observed in two patients. Both patients were obese females. Adjustments exceeding 5 mm were observed in all 13 patients. Related to the use of on-line portal imaging, treatment time was increased by a median of 36.5% (mean 45.8%; SD 42.1%). The range was 7.7 to 442%. The fraction of the total treatment time to perform corrections was 22.7% median (mean: 26.0; SD: 11.8%). Statistically significant systematic in-plane errors were found in 7/13 patients. A systematic error was detected on the lateral position of the field in five patients. In one patient a systematic error of the longitudinal field position and in one patient a rotational error was detected. For adjustments in the lateral direction the present method does not allow to detect lateral shifts of less than 2 mm. For adjustments in the longitudinal direction the sensitivity could not be estimated but the available data suggest that 80% of errors < or = 5 mm were not adjusted. In obese patients, random errors may be surprisingly large.