Catatonia may concomitantly occur with other psychiatric diagnoses such as
Major Depressive Disorder, however problem in diagnosis may arise due to
the overlapping features with other problems such as serotonin syndromes,
neuroleptic malignant syndromes and Parkinsonism. Despite the diagnostic
dilemma and lack of diagnostic tools, the clinical correlation between the
carbon monoxide poisoning and the late-onset development of the
Parkinsonian features is the highlight of this report.