Table 1.

Potential etiologies of ATL.

C	Chemotherapy (n = 34)
H	Heroin-induced (n = 6), whether via intravenous (n = 3) or inhaled (n = 3) routes
O	Opioid analogue (n = 14), abuse via various routes of “non-heroin” medications
I	Immunosuppressant (n = 11) or Imidazole medications (n = 2)
C	“Crack” cocaine abuse (n = 1)
E	Environmental (CO, n = 3) and Ethanol-related(n = 2)
S	Splenial lesions (RSL), total n = 9): which include AEDs (n = 7), chemotherapy (n = 1), immunosuppressant medication (n = 1)

Note: CO = Carbon monoxide, RSL = reversible splenial lesion, AEDs = anti-epileptic drugs.