Bilateral synchronous tumors with inheritable forms of RCC including von Hippel-Lindau Synchronous bilateral breast cancer at the time of diagnosis Unilateral, bilateral, unifocal, or multifocal DCIS Bilateral DCIS: bilateral breast imaging ? 90 days of registration (must include bilateral mammogram; can also include ultrasound or breast MRI) Patients must have had a bilateral mammogram within 12 months prior to registration, unless the initial surgery was a total mastectomy, in which case only a mammogram of the remaining breast is required; (subjects with bilateral total mastectomies do not require imaging) Patients with synchronous bilateral invasive disease are eligible as long as all the lesions assessed for HER2 on both sides are negative Patients with current and symptomatic pneumonitis, or extensive bilateral lung disease on high resolution CT scan Participants with bilateral diffuse lymphangitic carcinomatosis Women who have had a prior mastectomy (unilateral or bilateral), segmental mastectomy, reduction mammoplasty or breast augmentation including implants. Bilateral breast cancer Bilateral breast cancer is permitted; patients with bilateral breast cancer will be stratified as left-sided Prior bilateral orchiectomy Male is sterile due to a bilateral orchiectomy Multifocal gliomas that are bilateral; patients with unilateral multifocal gliomas may be eligible if their multifocal disease can be treated effectively and safely in a single MLA procedure; also note that corpus callosal tumors are eligible even if they are bilateral as long as they satisfy the size and shape limits of MLA as determined by the performing neurosurgeon Patients with simultaneous primaries or bilateral tumors are excluded, with the exception of patients with bilateral tonsil cancers or patients with T1-2, N0, M0 resected differentiated thyroid carcinoma, who are eligible Synchronous bilateral breast cancer at the time of diagnosis Extensive bilateral lung disease on high-resolution computed tomography (HRCT) scan Bilateral breast cancers are allowed if the treating clinician has determined the patient should be treated as ER+ and HER2- negative Bilateral invasive BC. Bilateral breast cancer Patients with simultaneous primaries or bilateral tumors are excluded, with the exception of patients with bilateral tonsil cancers or patients with T1-2, N0, M0 differentiated thyroid carcinoma (resected or management deferred), who are eligible Bilateral synchronous breast cancer Bilateral ocular adnexal involvement is permitted, if biopsy confirms unilateral disease and there is high clinical suspicion for bilateral disease, biopsy of the contralateral ocular adnexa can be waived Histologically proven unilateral or bilateral primary breast carcinoma; (in case of bilateral cancer, the investigator has to decide prospectively which side will be evaluated for the primary endpoint) Multiple or bilateral renal masses Choose bilateral mastectomy followed by bilateral immediate tissue expander breast reconstruction Multicentric or bilateral disease unless biopsy of the clinical abnormalities are performed and result is negative. Patients with bilateral synchronous renal masses Patient must have had a bilateral mammogram prior to NAC unless there is only one breast Ongoing therapy with LHRH analog or bilateral orchiectomy. Cases involving a bilateral operation Bilateral breast malignancy Patients with simultaneous primaries or bilateral tumors are excluded, with the exception of patients with bilateral tonsil cancers or patients with T1-2, N0, M0 differentiated thyroid carcinoma, who are eligible Patients with simultaneous primaries or bilateral tumors are excluded, with the exception of patients with bilateral tonsil cancers or patients with T1-2, N0, M0 resected differentiated thyroid carcinoma, who are eligible Peripheral bilateral edema requiring active medical management Patients with simultaneous primaries or bilateral tumors are excluded, with the exception of patients with bilateral tonsil cancers or patients with T1-2, N0, M0 resected differentiated thyroid carcinoma, who are eligible Bilateral prophylactic mastectomy Current unilateral or bilateral hydronephrosis Completely resected unilateral or bilateral primary carcinoma of the breast Patients with simultaneous primaries or bilateral tumors. Participants with multicentric (multiple tumors involving more than 1 quadrant) or bilateral breast cancer Physician recommendation of bilateral neck radiation History of or plans for bilateral mastectomies within the next 12 months Unilateral or bilateral retinoblastoma (RB) patients are eligible Participants with synchronous bilateral invasive disease are eligible only if both lesions are HER2-positive For subjects with two breasts, they must have had a bilateral mammogram prior to surgery Patients with synchronous bilateral breast cancers are eligible if at least one of the tumors is HER2-positive Bilateral breast cancers that individually meet eligibility criteria are allowed Prior bilateral orchiectomy Unifocal breast cancer (no evidence of gross multifocal disease, multicentric, or bilateral disease) Bilateral pulmonary metastasis Male subject is sterile due to a bilateral orchiectomy. Patients who have not had a bilateral orchiectomy must have a plan to maintain effective GnRG-analogue therapy for the duration of the trial Vasectomy or other procedure resulting in infertility (eg, bilateral orchiectomy) for >6 months Vasectomy or other procedure resulting in infertility (e.g., bilateral orchiectomy), performed at least 6 months before screening Patients with bilateral disease Prior bilateral orchiectomy Patients are having bilateral mastectomy Participants with bilateral synchronous or metachronous disease (DCIS, LCIS, ADH, ALH) are eligible Bilateral disease (diagnosed cancer in both breasts) Bilateral upper extremity LE Multiple or bilateral renal masses when more than one mass is operated on at the same time or within 4-months of each other Bilateral breast cancer Have any blood relatives diagnosed with bilateral breast cancer Bilateral tibial dysplasia Patients with bilateral upper extremity edema Patient with bilateral manipulation of axilla within the last 24 months Subjects with bilateral breast cancer are not eligible Bilateral breast cancer or planned bilateral mastectomy Subjects who have had radiation to both breasts or who have undergone bilateral mastectomies Bilateral diffuse lymphangitic carcinomatosis Prior bilateral salpingectomy; prior unilateral salpingectomy is allowed Bilateral mastectomy No patients with bilateral breast cancer Patients must have prior bilateral orchiectomy or be on continuous LHRH analogue therapy for the duration of study Bilateral hip replacement Bilateral mammography and hand-held ultrasound (if clinically indicated) performed prior to the MRI and ABUS Have bilateral breast cancer History of bilateral orchidectomy Presence of bilateral hip replacement prostheses Patients with synchronous bilateral breast cancers