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Periodic thigh pain from radicular endometriosis
  1. Giampietro Zanette1,
  2. Francesca Magrinelli2,
  3. Stefano Tamburin2
  1. 1Neurology Section, Pederzoli Hospital, Peschiera del Garda, Verona, Italy
  2. 2Department of Neurological and Movement Sciences, University of Verona, Verona, Italy
  1. Correspondence to Dr Stefano Tamburin, Department of Neurological and Movement Sciences, University of Verona, Piazzale Scuro 10, Verona I-37134, Italy; stefano.tamburin{at}

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Case report

A 38-year-old woman gave a 2-year history of periodic left anterior thigh pain (figure 1), described as deep and excruciating. It would begin 2–3 days before menstruation. Its numerical rating scale score ranged from 5 to 7/10, rapidly peaked (up to 10/10), lasted 5–6 days and then vanished, with no pain between menses. She had seen various orthopaedic and pain medicine specialists, with a thorough radiological work-up, including lumbosacral MRI with gadolinium contrast (figure 2) and ultrasound scan and MR scan of the abdomen and pelvis, which were all normal. She was diagnosed elsewhere with psychogenic pain and treated with benzodiazepines, selective serotonin reuptake inhibitors and psychotherapy, with no effect.

Figure 1

The patient's pain distribution.

Figure 2

Lumbosacral MRI (L4–L5 levels) was normal, even with gadolinium.

She was referred for neurological consultation, which she considered ‘the last resort’, before stopping any further medical test or treatment and living with the pain that had ‘no organic cause but came from a wrong state of mind’. On examination, the left patellar reflex was decreased and the femoral nerve stretch test was mildly positive on the left. According to the neuropathic pain diagnostic algorithm, she had probable neuropathic pain (table …

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