Rapid, symptomatic enlargement of a lumbar juxtafacet cyst: case report.
METHODS
A case is reported in which a 45-year-old man developed cauda equina syndrome caused by enlargement of an L4-L5 juxtafacet cyst diagnosed 4 months earlier.


OBJECTIVE
To highlight the short interval that can elapse between the discovery of a juxtafacet cyst and its remarkable progression.


BACKGROUND
Although juxtafacet cysts are acquired lesions, how long they take to develop remains unclear. Hemorrhage is a well-known cause of rapid or even dramatic cyst enlargement. This is the first report providing magnetic resonance imaging evidence of rapid, remarkable enlargement of a nonhemorrhagic juxtafacet cyst.


METHODS
The patient underwent conservative treatment for an L4-L5 right juxtafacet cyst diagnosed by magnetic resonance imaging during evaluation of posttraumatic lower back pain. Four months later, the patient presented with severe pain radiating down the right lateral leg, urinary retention, and impaired dorsal flexion of the right foot. Repeat magnetic resonance imaging showed the cyst now markedly enlarged and occupying almost the entire width of the canal.


RESULTS
The cyst was removed, and the patient's symptoms abated. At 15 months after surgery, he is symptom-free.


CONCLUSIONS
Juxtafacet cyst may occasionally enlarge and cause severe symptoms within months.
Paolini
Sergio
S
Department of Neurological Sciences, Neurosurgery, Az. Osp. S. Maria, Terni, Italy.
Ciappetta
Pasquale
P
Santoro
Antonio
A
Ramieri
Alessandro
A
D003560:Cysts / Q000150:complications* / Q000175:diagnosis* / Q000601:surgery; D018450:Disease Progression; D006801:Humans; D008161:Lumbosacral Region; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011128:Polyradiculopathy / Q000175:diagnosis* / Q000209:etiology*; D013124:Spinal Injuries / Q000150:complications; D021801:Zygapophyseal Joint / Q000601:surgery