Absence of enhancement in a lesion does not preclude primary central nervous system T-cell lymphoma: A case report

Table 1 The summary of patient's clinical symptoms, exam results, considered diagnosis, and treatment

Time	Initial	5 d after	1 month after
Neurologic symptom	Mild cognitive impairments	No significant change in MRC grade 3 left lower leg weakness	Changed mental status to comatose
	MRC grade 3 left lower leg weakness
MRI	Asymmetric hyperintensities at the bilateral periventricular white matters, basal ganglia, thalamus, cerebral and cerebellar peduncles	No significant change in extent of T2 hyperintense lesion	Reduced extent of T2 hyperintense lesion in right basal ganglia, but increased extent in left hemisphere compressing left lateral ventricle
			Newly appeared SAH
Laboratory exams	Slight elevation of WBC in CSF	Nonspecific	Nonspecific
Considered diagnoses	Neuro-Behçet’s disease	Neuro-Behçet’s disease	Glioblastoma
			Lymphoma
			Metastasis
Treatment	Prednisolone at 1 mg/d for 5 d	None	Supportive care for bacteremia and sepsis

MRC: Medical Research Council; WBC: White blood cell; CSF: Cerebrospinal fluid; SAH: Subarachnoid hemorrhage; MRI: Magnetic resonance imaging.