Inclusion Criteria:

          -  Previous treatment for meningioma including surgery, when possible, and radiation
             therapy (conventional fractionated or radiosurgery). Pathologic confirmation of
             meningioma is not required for patients who are not surgical candidates and received
             radiation therapy based on magnetic resonance imaging (MRI) consistent with
             meningioma. Patients with prior surgery will have pathologic confirmation of
             meningioma with either formalin-fixed paraffin-embedded (FFPE) tumor block OR
             meningioma tissue slides available for submission to central pathology review

          -  Radiographic evidence of meningioma progression with measurable disease, defined as an
             increase in size of the measurable primary lesion on imaging by 15% or more (sum of
             the bidirectional measurements) in an approximate 6 month time period (i.e.,
             calculated rate of growth 15% / 6 months based on available scans) or by the
             appearance of a new measurable lesion

          -  Previous treatment with either fractionated radiation therapy or stereotactic
             radiosurgery at the site of progressive meningioma, without safe option for further
             radiotherapy

          -  Willing to undergo 68Ga-DOTATATE PET imaging. 68Ga-DOTATATE PET imaging must be
             Krenning score must be a score of 2 or higher, suggesting somatostatin receptor
             expression, to be enrolled on the study

          -  Measurable disease

          -  Eastern Cooperative Oncology Group (ECOG) performance status (PS) =< 2

          -  Absolute neutrophil count (ANC) >= 1500/mm (obtained =< 14 days prior to registration)

          -  Platelet count >= 100,000/mm (obtained =< 14 days prior to registration)

          -  Hemoglobin >= 9.0 g/dL (obtained =< 14 days prior to registration)

          -  Direct bilirubin < 1.5 x upper limit of normal (ULN) (or total bilirubin =< 3.0 x ULN
             with direct bilirubin =< 1.5 x ULN in patients with well-documented Gilbert's
             syndrome) (obtained =< 14 days prior to registration)

          -  Aspartate transaminase (AST) =< 3 x ULN (obtained =< 14 days prior to registration)

          -  Prothrombin time (PT)/international normalized ratio (INR)/partial thromboplastin time
             (PTT) =< 1.5 x ULN OR if patient is receiving anticoagulant therapy and PT or PTT is
             within therapeutic range of intended use of coagulants (obtained =< 14 days prior to
             registration)

          -  Calculated creatinine clearance must be >= 40 ml/min using the Cockcroft-Gault formula
             (obtained =< 14 days prior to registration)

          -  Negative pregnancy test done =< 7 days prior to registration, for women of
             childbearing potential only

               -  Note: A negative pregnancy test needs to be done within 48 hours of receiving
                  LUTATHERA treatment

               -  Note: Patients with surgical sterilization or who have been post-menopausal for
                  at least 2 years are excluded from pregnancy testing, but this must be documented

          -  Ability to complete questionnaire(s) by themselves or with assistance

          -  Provide written informed consent

          -  Willing to return to enrolling institution for follow-up (during the active monitoring
             phase of the study)

          -  Willing to sign consent onto the Mayo Clinic Radiotherapy Patient Outcomes Registry
             and Biobanking study, IRB number 15-000136

               -  Note: The blood draw is optional

        Exclusion Criteria:

          -  Eligibility for surgical or radiation treatment with curative intent

          -  Any of the following because this study involves an agent that has known genotoxic,
             mutagenic and teratogenic effects:

               -  Pregnant women

               -  Nursing women

               -  Men or women of childbearing potential who are unwilling to employ adequate
                  contraception

          -  Co-morbid systemic illnesses or other severe concurrent disease which, in the judgment
             of the investigator, would make the patient inappropriate for entry into this study or
             interfere significantly with the proper assessment of safety and toxicity of the
             prescribed regimens

          -  Contraindications to or intolerance of MRI

          -  Immunocompromised patients and patients known to be human immunodeficiency virus (HIV)
             positive and currently receiving antiretroviral therapy

               -  Note: Patients known to be HIV positive, but without clinical evidence of an
                  immunocompromised state, are eligible for this trial

          -  Uncontrolled intercurrent illness including, but not limited to, ongoing or active
             infection, symptomatic congestive heart failure (New York Heart Association [NYHA] II,
             III, IV), unstable angina pectoris, uncontrolled diabetes mellitus (fasting blood
             glucose > 2 ULN), cardiac arrhythmia, or psychiatric illness/social situations that
             would limit compliance with study requirements

          -  Receiving any other investigational agent which would be considered as a treatment for
             the primary neoplasm

               -  Note: This includes treatment with somatostatin LAR within 4 weeks prior to
                  enrollment, or any patient receiving treatment with short-acting octreotide that
                  cannot be interrupted for greater than 24 hours before treatment

          -  Other active malignancy =< 2 years prior to registration

               -  Exceptions: Non-melanotic skin cancer or carcinoma-in-situ of the cervix

               -  Note: If there is a history of prior malignancy, they must not be receiving other
                  specific treatment for their cancer

          -  History of myocardial infarction =< 6 months, or congestive heart failure requiring
             use of ongoing maintenance therapy for life-threatening ventricular arrhythmias

          -  Current spontaneous urinary incontinence making impossible the safe administration of
             LUTATHERA

          -  Significant toxicity related to previous radiation therapy including radiation
             necrosis, radiation optic neuropathy, or radiation retinopathy

          -  Optic nerve sheath meningioma, extracranial meningioma