We report the recurrence of a localized conjunctival lymphoma arising
in mucosal-associated lymphoid tissue (MALToma) in the psoas muscle, 1
8 months after initial treatment with radiotherapy. Findings from syst
emic investigations demonstrated MALToma recurrences in the psoas musc
le and the stomach. Ocular adnexal MALTomas typically manifest as loca
lized tumors, which respond well to radiotherapy, but a proportion may
recur in typical MALT sites. To our knowledge, this is the first repo
rt of a recurrence in the psoas muscle, and the clinical implication i
s that all patients with ocular adnexal lymphomas need to be followed
up for an indefinite period.