Skin Hyperpigmentation as the Presenting Symptom of Subacute Combined Degeneration of the Spinal Cord

Table 1

Laboratory findings.

Investigation	At presentation	6 weeks after treatment	Reference range
Hemoglobin (gm/dL)	10.3	13.4	12.5–17.5 gm/dL
Mean corpuscular volume (MCV) (fL)	112	94.6	78–100 fL
Serum vitamin B12 (pg/mL)	83	>2000	200–1200 pg/mL
Serum folic acid (ng/mL)	>20	13.75	4.6–18.7 ng/mL
Methylmalonic acid (MMA) (nmol/l)	54.800	—	87–318 nmol/l
Anti-intrinsic factor antibodies	Positive
Antinuclear antibody (ANA)	Negative