Several forefoot conditions produce pain, numbness, and burning between the toes that closely mirrors Morton’s neuroma, and getting the wrong diagnosis is surprisingly common. Intermetatarsal bursitis, plantar plate tears, stress fractures, joint inflammation, and even true nerve tumors can all show up in the same spot with overlapping symptoms. The confusion matters because these conditions require different treatments, and a misdiagnosis can mean months of ineffective therapy or, worse, unnecessary surgery on a nerve that was never the problem.
Intermetatarsal Bursitis Is the Most Common Mimic
The condition most frequently confused with Morton’s neuroma is intermetatarsal bursitis, an inflammation of the small fluid-filled sac (bursa) that sits between the metatarsal heads. Both conditions cause pain in the ball of the foot, and both tend to flare up with walking or wearing tight shoes. A recent prospective study comparing MRI and ultrasound in patients with intermetatarsal pain found that over half of the patients had bursitis on MRI, while only about one in five actually had a neuroma.1PubMed Central. Morton’s Neuroma or Intermetatarsal Bursitis—A Prospective Diagnostic Study of Intermetatarsal Pain That finding suggests bursitis may account for a large share of cases initially labeled as Morton’s neuroma.
What makes the overlap so tricky is that even a classic clinical sign can point the wrong way. The Mulder test, where a clinician squeezes the forefoot and feels for a click, can be positive with bursitis as well as with a neuroma. In one case report, a 60-year-old woman had a positive Mulder test that suggested a neuroma, but ultrasound revealed a fluid collection with a thickened bursal wall and no nerve thickening at all, ruling out the neuroma entirely.2PubMed Central. Ultrasound-Guided Diagnosis of Intermetatarsal Bursitis Mimicking Morton’s Neuroma: A Case Report The treatments diverge sharply: bursitis often responds to anti-inflammatory measures and footwear changes, while a true neuroma may eventually require corticosteroid injections or surgical excision of the nerve.
Plantar Plate Tears
The plantar plate is a thick ligament on the underside of each toe joint that keeps the toe from drifting upward. When it degenerates or tears, the pain typically centers at the second toe joint, which happens to sit right next to the second web space where neuromas also occur. Swelling and scar tissue from a plantar plate tear can spill into the tissue around the joint, and that fibrotic change in the surrounding fat can look remarkably like a neuroma on imaging.3PubMed. Imaging of Lesser Metatarsophalangeal Joint Plantar Plate Degeneration, Tear, and Repair
There are clues that help distinguish the two. A plantar plate tear tends to produce pain right at the base of the toe rather than deeper in the web space, and the affected toe may gradually drift sideways or curl upward over time. On MRI, radiologists can look for specific signs like inflammation at the toe’s attachment point and subluxation of the flexor tendon. When it is hard to distinguish the scar tissue from a neuroma, checking for splaying of the second and third toes and tendon displacement is the most helpful combination for getting the right answer.4PubMed. Predictive MRI correlates of lesser metatarsophalangeal joint plantar plate tear The distinction is critical: plantar plate tears are treated with taping, stiff-soled shoes, or surgical repair of the ligament, none of which addresses a nerve problem.
Stress Fractures and Freiberg Infraction
A metatarsal stress fracture causes pain in the ball of the foot that worsens with activity, which sounds a lot like a neuroma. Stress fractures tend to hurt more directly over the metatarsal bone rather than in the soft tissue between bones, and they usually come with subtle swelling, but in the early stages the distinction can be hard to make on physical exam alone. The pain is often more proximal than a neuroma and may be tender when pressing directly on the shaft of the bone.
Freiberg infraction is a less well-known condition that affects the head of a metatarsal bone, usually the second or third. It involves a loss of blood supply to the bone, leading to collapse of the joint surface. On MRI it appears as a distinct area of abnormal signal in the metatarsal head, and as the condition advances the joint surface flattens and develops irregularities.5Radiol Bras. Metatarsalgias: differential diagnosis with magnetic resonance imaging Freiberg infraction primarily affects younger women and adolescents, which sets it apart demographically from the typical neuroma patient. It progresses through stages, eventually narrowing the joint space and forming bone spurs. Because the pain localizes to the ball of the foot and worsens with push-off, patients often receive a neuroma diagnosis before imaging reveals the bone damage.
Joint Inflammation and Rheumatoid Nodules
Synovitis and capsulitis of the metatarsophalangeal joints, the joints where the toes meet the foot, cause pain and tenderness along the top of the joint. Because these joints sit immediately beside the intermetatarsal spaces, clinicians sometimes struggle to pinpoint whether the tenderness is coming from the joint or from the web space. Pain on the dorsal side of the joint points toward joint inflammation rather than a neuroma, but when the swelling is diffuse the lines blur.
A more surprising mimic is the rheumatoid nodule. In people with rheumatoid arthritis, nodules can form in the intermetatarsal space and produce symptoms nearly identical to a neuroma, including burning, shooting pain, and a palpable lump. Case reports describe patients undergoing what was expected to be a neuroma excision, only for the pathology report to come back showing a rheumatoid nodule instead.6PubMed Central. Rheumatoid nodule presenting as a Morton’s neuroma in the foot: An important differential diagnosis to consider While this is uncommon, rheumatoid synovitis and nodules producing symptoms that mimic a neuroma have been documented repeatedly, mostly in patients who already carry a rheumatoid arthritis diagnosis.7PubMed Central. Rheumatoid nodule presenting as Morton’s neuroma If you have rheumatoid arthritis and develop new forefoot pain between the toes, it is worth flagging for your doctor as a possible manifestation of the underlying disease rather than a separate nerve problem.
True Nerve Tumors
Morton’s neuroma is not actually a tumor. It is a thickening of fibrous tissue around the digital nerve caused by chronic irritation.8PubMed Central. Morton’s neuroma – Current concepts review Genuine nerve tumors, however, do occasionally occur in the foot and can be mistaken for a neuroma on clinical examination. Schwannomas, which are benign growths arising from the nerve sheath, have been reported in the foot and can cause localized pain and tenderness that overlaps with neuroma symptoms.9PubMed Central. Schwannoma of the foot: report of four cases and literature review These are rare, but they matter because a schwannoma is typically treated by careful surgical removal that preserves the nerve, which is the opposite of a neurectomy where the nerve is deliberately cut. An MRI can often distinguish a true nerve tumor from a neuroma because the tumor appears as a well-defined mass with characteristic signal patterns, while a neuroma looks more like diffuse thickening of the nerve.
Why Morton’s Neuroma Itself Is an Uncertain Diagnosis
Part of the reason so many conditions get confused with Morton’s neuroma is that the neuroma itself is not a crisp, clearly defined entity. A study comparing nerve specimens from patients who had neuroma surgery with specimens taken from cadavers who had no foot complaints found that, under the microscope, the tissue looked the same in both groups. The only measurable difference was that the nerves from symptomatic patients tended to be thicker, but even there, there was wide overlap in the middle range.10PubMed. Morton’s intermetatarsal neuroma: morphology and histological substrate That raises an uncomfortable question: if pathologists cannot reliably distinguish a “neuroma” nerve from a normal one, how confident can we be in the diagnosis even after surgery?
This ambiguity means the label “Morton’s neuroma” is sometimes applied as a catch-all for intermetatarsal pain that does not have an obvious other cause. When conservative treatment fails and surgery is performed, the histological examination of the removed tissue may confirm the diagnosis or it may reveal something else entirely, like a rheumatoid nodule or bursitis. In one surgical series, histopathology confirmed a neuroma in the vast majority of operated cases, but nearly all of those specimens also showed prominent degeneration of the surrounding soft tissue, suggesting that whatever is happening involves more than just the nerve.11PubMed. Morton’s metatarsalgia: sonographic findings and correlated histopathology
How Clinicians Sort Through the Possibilities
Given the lineup of mimics, the physical examination becomes the first line of defense. The most useful bedside test is the thumb-index finger squeeze, where the examiner presses up from the sole of the foot and down from the top to compress the web space. A systematic review found this test to be very sensitive for detecting a neuroma, catching the vast majority of true cases. A patient’s own report of a subjective clicking sensation in the forefoot turns out to be highly specific, meaning if you feel a click, there is a strong chance a neuroma is actually present rather than a mimic.12PubMed Central. Diagnostic Accuracy of Subjective Features and Physical Examination Tests for Morton Neuroma: A Systematic Review
The classic Mulder click test, where the examiner squeezes the forefoot side to side while pressing on the web space, is less sensitive. One study comparing clinical tests against ultrasound found that the thumb-index finger squeeze had a sensitivity and accuracy of about 96%, while the Mulder click came in around 61%. A positive Mulder click was associated with larger neuromas, suggesting it picks up more advanced cases but misses smaller ones.13PubMed. Diagnostic Accuracy of Clinical Tests for Morton’s Neuroma Compared With Ultrasonography Other tests like foot squeeze, plantar percussion, and pinprick testing performed poorly in comparison. The takeaway for patients: if your clinician relies only on one test or skips imaging, the chance of confusing a neuroma with something else goes up.
What Imaging Adds to the Picture
Ultrasound and MRI are the two main imaging tools used to evaluate forefoot pain, and both perform well for detecting neuromas. A meta-analysis found that both modalities had a sensitivity around 90% for picking up a neuroma, with no meaningful difference between them in detection ability. MRI edged ahead in specificity, reaching essentially perfect specificity compared to a somewhat lower specificity for ultrasound.14PubMed. Ultrasound versus magnetic resonance imaging for Morton neuroma: systematic review and meta-analysis That specificity gap matters for ruling out mimics: MRI is better at confirming that what you are seeing really is a neuroma and not bursitis or a plantar plate tear masquerading as one.
A more recent prospective study comparing dynamic ultrasound with MRI found that ultrasound achieved even higher diagnostic accuracy, around 99%, compared to about 89% for MRI. The difference was statistically significant, and ultrasound was particularly good at distinguishing neuromas from intermetatarsal bursitis.15PubMed. Dynamic ultrasound (DUS) versus magnetic resonance imaging (MRI) for the diagnosis of Morton’s neuroma: A prospective comparative study Ultrasound has practical advantages too: it is cheaper, faster, and can be done in the office while the clinician watches the foot in real time. MRI excels when the picture is murky, because it can simultaneously evaluate the plantar plate, joint capsules, metatarsal bones, and surrounding soft tissue, catching conditions that ultrasound might miss because the operator was not looking for them.
The interplay between the two modalities can itself be revealing. The prospective study on intermetatarsal pain found that ultrasound identified bursitis in nearly all patients but found zero neuromas, while MRI found neuromas in some of those same patients and bursitis in about half.1PubMed Central. Morton’s Neuroma or Intermetatarsal Bursitis—A Prospective Diagnostic Study of Intermetatarsal Pain Even asymptomatic control subjects had web space findings on imaging in about a third of cases, reinforcing that an imaging finding alone does not equal a diagnosis. Context matters: the image has to match the clinical picture.
The Role of Diagnostic Injections
When clinical tests and imaging leave uncertainty, some clinicians turn to diagnostic nerve blocks. The idea is straightforward: inject a small amount of local anesthetic around the suspected neuroma, and if the pain disappears, the nerve must be the source. In practice, the picture is muddier. The anesthetic can spread beyond the nerve and numb the bursa, joint capsule, or plantar plate nearby, producing a false positive. One anatomical validation study found that Morton’s neuroma injections tended to spread proximally along the nerve, potentially numbing structures beyond the intended target and reducing the specificity of the test.16PubMed Central. Anatomical Validation of a Selective Anesthetic Block Test to Differentiate Morton’s Neuroma from Mechanical Metatarsalgia
A study examining whether pre-surgical diagnostic blocks improved outcomes after neuroma excision found that they did not. Patients who received a diagnostic block before surgery fared no better than those who went straight to surgery based on clinical and imaging findings alone.17PubMed Central. The role of diagnostic block in the management of Morton’s neuroma This does not mean injections are useless, but it suggests that a block that confirms pain relief may not actually prove the nerve was the culprit. If the anesthetic leaked into the nearby bursa or joint, you got relief for the wrong reason, and surgery on the nerve may not help.
When Surgery Does Not Solve the Problem
Misdiagnosis becomes most consequential when it leads to surgery. Neurectomy, the standard surgical treatment for Morton’s neuroma, involves cutting out a segment of the digital nerve. When the original diagnosis was correct, most patients improve. But when the real problem was bursitis, a plantar plate tear, or another mimic, removing a piece of nerve will not address the true source of pain and may leave the patient with permanent numbness on top of the original complaint.
Even in confirmed cases, recurrent pain after neurectomy is not uncommon. A study of 30 patients who returned with pain after initial neuroma surgery found that while over 80% improved after a second operation, fewer than half achieved complete relief, and a majority still experienced discomfort in certain types of shoes.18PubMed. Recurrent pain following interdigital neurectomy–a plantar approach In some of these revision cases, the issue is a stump neuroma that forms at the cut end of the nerve. In others, the original diagnosis may have been wrong or incomplete, and the real pain generator was a neighboring structure all along.
Conditions That Coexist Rather Than Mimic
A detail that complicates the whole picture is that more than one problem can exist in the same foot at the same time. A patient can have both a neuroma and bursitis in the same web space, or a neuroma alongside a plantar plate tear in the adjacent joint. When multiple pathologies overlap, treating only one may leave residual pain that gets blamed on a failed surgery or a misdiagnosis, when in reality the second condition was never addressed. Comprehensive imaging that evaluates the entire forefoot, rather than just the web space, helps catch these coexisting problems before treatment decisions are made.
Foot structure itself can contribute. Morton’s foot syndrome, a hereditary condition where the first metatarsal bone is shorter than the second, shifts weight distribution toward the second and third metatarsal heads. This altered loading can predispose someone to both metatarsalgia and neuroma-like symptoms, and the underlying biomechanical issue may persist even after a neuroma is treated.19PubMed Central. Morton’s Foot Syndrome: A Case Report and Overview Confusingly, Morton’s foot syndrome and Morton’s neuroma are named after different Mortons. The foot syndrome is named after Dudley Morton, an anatomist, while the neuroma is attributed to Thomas George Morton, a surgeon. The shared surname adds a layer of confusion that trips up patients and the occasional clinician alike.
Complex Regional Pain Syndrome After Foot Surgery
An uncommon but serious complication that can follow any foot surgery, including neurectomy, is complex regional pain syndrome. This is a chronic pain condition where the nervous system overreacts to an injury, producing burning pain, swelling, and skin changes that spread beyond the original surgical site. A patient who develops escalating pain after neuroma surgery might reasonably assume the original problem was not fixed, but the new pain may have a completely different origin. Early recognition is important because the condition responds best to treatment in its first weeks.20PubMed Central. Reversal of acute complex regional pain syndrome using the practical application of neurodiagnostic evaluation process: a case study If pain after foot surgery is getting worse rather than better, is spreading to areas that were not operated on, or is accompanied by unusual skin color or temperature changes, it warrants prompt evaluation for this condition rather than a second operation on the nerve.