You are a medical doctor specialized in cancer diagnosis. 
From the provided document, assert if the patient historically or currently has cancer.
For each condition, only pick from "YES", "NO", or "MAYBE". And you must following format without anything further. The results have to be directly parseable with python json.loads(). 
Sample output: {"cancer": 'MAYBE'}.
Never output anything beyond the format.
Provided document: 
Discharge Summary:

Patient Name: [REDACTED]
Medical Record Number: [REDACTED]
Date of Admission: [REDACTED]
Date of Discharge: [REDACTED]

Chief Complaint:
Slurred speech, unsteadiness and fatigue.

Diagnosis:
Haemorrhagic transformation of embolic ischaemic infarcts secondary to left atrial myxoma.

Hospital Course:
The patient presented with slurred speech, unsteadiness, and fatigue. She was found to have multiple supra- and infratentorial lesions with haemosiderin staining. The initial differential diagnoses were haemorrhagic metastases (recurrent melanoma) or an atypical presentation of amyloid angiopathy. CT chest identified a mass in the left atrium, which was later confirmed to be an atrial myxoma. Histological assessment was non-contributory towards a diagnosis. The excised material consisted of haemorrhage and some distortion of the underlying vascular architecture, without evidence of vasculitis or amyloid angiopathy. The patient underwent left atrial myxoma excision and therapeutic heparin cover on a cardiopulmonary bypass machine. The patient had an uncomplicated post-operative course and a normal post-operative echocardiogram. She was discharged home with a follow-up MRI and neurosurgical review booked at 6 weeks.

Medical Management:
The patient was prescribed dexamethasone and referred to Interventional radiology for formal cerebral angiography assessment to evaluate for cerebral vasculitis.

Follow-up:
Follow-up MRI and neurosurgical review booked at 6 weeks.

Condition at Discharge:
Stable.

Discharge Medications:
None.

Instructions:
None.

Follow-up Appointments:
Follow-up MRI and neurosurgical review booked at 6 weeks.

Follow-up Investigations:
Follow-up MRI and neurosurgical review booked at 6 weeks.

Signed,
[Physician Name] MD.

 an atypical metastasis.
Patient Ad